HomeMy WebLinkAbout2023-100 - Resolution RESOLUTION NO. 2023-100
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF RANCHO
CUCAMONGA, CALIFORNIA, ADOPTING A GENERATING FACILITY
INTERCONNECTION ELECTRIC SERVICE RULE
A. Recitals
1. The City Council of the Rancho Cucamonga has previously adopted Chapter 3.46 of Title 3
of the Rancho Cucamonga Municipal Code establishing Electricity Service Rules and
Regulations, which may be amended from time to time by Resolution;
2. City staff has prepared a Generating Facility Interconnection Service Rule, describing the
interconnection, operating and metering requirements for generation facilities to be connected
to the Rancho Cucamonga Municipal Utility's (RCMU's) distribution system while protecting
the safety and reliability of the distribution system at the local and system levels; and
3. The City Council has reviewed the adoption of this Resolution pursuant to the requirements
of the California Environmental Quality Act of 1970 ("CEQA"), as amended, and has
determined that the adoption of the Resolution is exempt from the CEQA review pursuant to
State CEQA Guidelines Section 15061(b)(3).
B. Resolution
NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF RANCHO CUCAMONGA,
HEREBY RESOLVES,
1. The facts set forth in Part A, Recitals, of this Resolution are true and correct.
2. The City Council hereby approves and adopts the Generating Facility Interconnection Service
Rule set forth in Exhibit A, which is attached hereto and incorporated herein by this reference.
3. This City Clerk shall certify to the adoption of this Resolution.
4. This Resolution shall take effect immediately upon its adoption.
Resolution No. 2023-100 - Page 1 of 35
PASSED, APPROVED, AND ADOPTED this 6th day of September, 2023.
L. D nnis Michael, Mayor
ATTEST:
Z7 4J
, ice C. Reynolds, City derk
STATE OF CALIFORNIA )
COUNTY OF SAN BERNARDINO ) ss
CITY OF RANCHO CUCAMONGA )
I,Janice C. Reynolds, City Clerk of the City of Rancho Cucamonga, do hereby certify
that the foregoing Resolution was duly passed, approved, and adopted by the City Council of
the City of Rancho Cucamonga, at a Regular Meeting of said Council held on the 6th day of
September, 2023.
AYES: Hutchison, Kennedy, Michael, Scott, Stickler
NOES: None
ABSENT: None
ABSTAINED: None
Executed this 71h day of September, 2023, at Rancho Cucamonga, California.
nice C. Reynolds, City ClGtrk
Resolution No. 2023-100 - Page 2 of 35
ExhibitA
Electric Service Rule-Generating Facility Interconnection
A. APPLICABILITY
Applicability: This Rule describes the Interconnection, operating and Metering requirements for
Generating Facilities to be connected to Rancho Cucamonga Municipal Utility's ("RCMU")
Distribution System. Subject to the requirements of this Rule, RCMU will allow the
Interconnection of Generating Facilities with its Distribution System.
Definitions: Capitalized terms used in this Rule, and not defined in RCMU's other rules, shall
have the meaning ascribed to such terms in Section H of this Rule. The definitions set forth in
Section H of this Rule shall only apply to this Rule and may not apply to RCMU's other rules.
In the event of any conflict between this rule and any of the standards listed herein, the
requirements of this rule shall take precedence.
B. DEFINITIONS
The definitions in this Section are applicable only to this Rule,the Application and Interconnection
Agreements.
Anti-Islanding: A control scheme installed as part of the Generating Facility or Interconnection
Facilities that senses and prevents the formation of an Unintended Island.
Applicant: The entity submitting an Application for Interconnection pursuant to this Rule.
Application: A standard RCMU provided form submitted to RCMU for Interconnection of a
Generating Facility.
Certification Test: A test pursuant to this Rule that verifies conformance of certain equipment
with RCMU-approved performance standards in order to be classified as Certified Equipment.
Certification Tests are performed by NRTLs.
Certification; Certified; Certificate: The documented results of a successful Certification
Testing.
Certified Equipment: Equipment that has passed all required Certification Tests.
Commissioning Test: A test performed during the commissioning of all or part of a Generating
Facility to achieve one or more of the following:
• Verify specific aspects of its performance;
• Calibrate its instrumentation; and
• Establish instrument or Protective Function set-points.
Resolution No. 2023-100 - Page 3 of 35
Customer: The entity that receives or is entitled to receive Distribution Service through the
RCMU's Distribution System.
Dedicated Transformer; Dedicated Distribution Transformer: A transformer that provides
electricity service to a single Customer. The Customer may or may not have a Generating Facility.
Device: A mechanism or piece of equipment designed to serve a purpose or perform a function.
The term may be used interchangeably with the terms "equipment" and "function" without
intentional difference in meaning. See also Function and Protective Function.
Distribution Service: All services required by, or provided to, a Customer pursuant to the
approved rate schedules and rules of RCMU.
Distribution System: All electrical wires, equipment, and other facilities owned or provided by
RCMU, by which RCMU provides Distribution Service to its Customers.
Emergency: An actual or imminent condition or situation, which jeopardizes RCMU's
Distribution System Integrity.
Field Testing: Testing performed in the field to determine whether equipment meets RCMU's
requirements for safe and reliable Interconnection.
Function: Some combination of hardware and software designed to provide specific features or
capabilities.Its use,as in Protective Function,is intended to encompass a range of implementations
from a single-purpose device to a section of software and specific pieces of hardware within a
larger piece of equipment to a collection of devices and software.
Generating Facility: All Generators, electrical wires, equipment, and other facilities owned or
provided by Producer for the purpose of producing electric power.
Generator: A device converting mechanical, chemical or solar energy into electrical energy,
including all of its protective and control Functions and structural appurtenances. One or more
Generators comprise a Generating Facility.
Gross Nameplate Rating; Gross Nameplate Capacity: The total gross generating capacity of a
Generator or Generating Facility as designated by the manufacturer(s) of the Generator(s).
Host Load: The electrical power, less the Generator auxiliary load, consumed by the Customer,
to which the Generating Facility is connected.
Initial Review: The review by RCMU, following receipt of an Application, to determine the
following: (a) the Generating Facility qualifies for Simplified Interconnection; or (b) if the
Generating Facility can be made to qualify for Interconnection with a Supplemental Review
determining any additional requirements.
In-rush Current: The current determined by the In-rush Current Test.
Interconnection Agreement: An agreement between RCMU and the Producer that gives certain
rights and obligations to effect or end Interconnection.
Resolution No. 2023-100 - Page 4 of 35
Interconnection; Interconnected: The physical connection of a Generating Facility in
accordance with the requirements of this Rule so that Parallel Operation with RCMU's
Distribution System can occur(or has occurred).
Interconnection Facilities: The electrical wires, switches and related equipment that are required
in addition to the facilities required to provide electric Distribution Service to a Customer to allow
Interconnection. Interconnection Facilities may be located on either side of the Point of Common
Coupling as appropriate to their purpose and design. Interconnection Facilities may be integral to
a Generating Facility or provided separately.
Interconnection Study:A study to establish the requirements for Interconnection of a Generating
Facility with RCMU's Distribution System.
Island;Islanding:A condition on RCMU's Distribution System in which one or more Generating
Facilities deliver power to Customers using a portion of RCMU's Distribution System that is
electrically isolated from the remainder of RCMU's Distribution System.
Line Section: That portion of RCMU's Distribution System connected to a Customer bounded by
automatic sectionalizing devices or the end of the distribution line.
Load Carrying Capability: The maximum electrical load that may be carried by a section of
RCMU's Distribution System consistent with reliability and safety under the circumstances being
evaluated.
Metering: The measurement of electrical power in kW and/or energy in kWh, and, if necessary,
reactive power in WAR at a point, and its display to RCMU, as required by this Rule.
Metering Equipment: All equipment,hardware, software including meter cabinets, conduit, etc.,
that are necessary for Metering.
Momentary Parallel Operation: The interconnection of a Generating Facility to the Distribution
System for one second (60 cycles) or less.
Nationally Recognized Testing Laboratory (NRTL): A laboratory accredited to perform the
Certification Testing requirements under this Rule.
Net Energy Metering: Metering for the receipt and delivery of electricity between the Producer
and RCMU over a timeframe established per the applicable NEM rate, the difference between
these two values yields either net consumption or surplus over the given time period.
Net Generation Output Metering: Metering of the net electrical power output in kW or energy
in kWh, from a given Generating Facility. This may also be the measurement of the difference
between the total electrical energy produced by a Generator and the electrical energy consumed
by the auxiliary equipment necessary to operate the Generator. For a Generator with no Host Load
and/or Public Utilities Code Section 218 Load (Section 218 Load), Metering that is located at the
Point of Common Coupling. For a Generator with Host Load and/or Section 218 Load, Metering
that is located at the Generator but after the point of auxiliary load(s) and prior to serving Host
Load and/or Section 218 Load.
Resolution No. 2023-100 - Page 5 of 35
Net Nameplate Rating: The Gross Nameplate Rating minus the consumption of electrical power
of a Generator or Generating Facility as designated by the manufacturer(s) of the Generator(s).
Network Service: More than one electrical feeder providing Distribution Service at a Point of
Common Coupling.
Non-Export; Non-Exporting Scheme: Designed to prevent the transfer of electrical energy from
the Generating Facility to RCMU's Distribution System.
Non-Islanding: Designed to detect and disconnect an Unintended Island with matched load and
generation. Reliance solely on under/over voltage and frequency trip is not considered sufficient
to qualify as Non-Islanding.
Parallel Operation: The simultaneous operation of a Generator with power delivered or received
by RCMU while Interconnected. For the purpose of this Rule, Parallel Operation includes only
those Generating Facilities that are Interconnected with RCMU's Distribution System for more
than 60 cycles (one second).
Paralleling Device: An electrical device, typically a circuit breaker, operating under the control
of a synchronization function or by a qualified operator to connect an energized generator to an
energized electric power system or two energized power systems to each other.
Periodic Test: A test performed on part or all of a Generating Facility/Interconnection Facilities
at pre-determined time or operational intervals to achieve one or more of the following:
• Verify specific aspects of its performance
• Calibrate instrumentation
• Verify and re-establish instrument or Protective Function set-points.
Point of Common Coupling (PCC): The transfer point for electricity between the electrical
conductors of RCMU and the electrical conductors of the Producer.
Point of Common Coupling Metering: Metering located at the Point of Common Coupling. This
is the same Metering as Net Generation Metering for Generating Facilities with no Host Load
and/or Section 218 Load.
Point of Interconnection: The electrical transfer point between a Generating Facility and
RCMU's Distribution System. This may or may not be coincident with the Point of Common
Coupling.
Producer: The entity that executes an Interconnection Agreement with RCMU. The Producer
may or may not own or operate the Generating Facility, but is responsible for the rights and
obligations related to the Interconnection Agreement.
Production Test: A test performed on each device coming off the production line to verify certain
aspects of its performance.
Resolution No. 2023-100 - Page 6 of 35
Protective Function(s): The equipment, hardware and/or software in a Generating Facility
(whether discrete or integrated with other functions) whose purpose is to protect against Unsafe
Operating Conditions.
Prudent Electrical Practices: Those practices, methods, and equipment, as changed from time
to time, that are commonly used in prudent electrical engineering and operations to design and
operate electric equipment lawfully and with safety, dependability, efficiency and economy.
Scheduled Operation Date: The date specified in the Interconnection Agreement when the
Generating Facility is, by the Producer's estimate, expected to begin operation pursuant to this
Rule.
Secondary Network: A network supplied by several primary feeders suitably interlaced through
the area in order to achieve acceptable loading of the transformers under emergency conditions
and to provide a system of extremely high service reliability. Secondary networks usually operate
at 600 V or lower.
Section 218 Load: Electrical power that is supplied in compliance with California Public Utilities
Code Section 218. Public Utilities Code Section 218 defines an "Electric Corporation" and
provides conditions under which a transaction involving a Generating Facility would not classify
a Producer as an Electric Corporation. These conditions relate to "over-the-fence" sale of
electricity from a Generating Facility without using RCMU's Distribution System.
Short Circuit (Current) Contribution Ratio (SCCR): The ratio of the Generating Facility's
short circuit contribution to the short circuit contribution provided through RCMU's Distribution
System for a three-phase fault at the high voltage side of the distribution transformer connecting
the Generating Facility to RCMU's system.
Simplified Interconnection: Interconnection conforming to the Initial Review requirements
under this Rule, as determined by Section I.
Single Line Diagram; Single Line Drawing: A schematic drawing, showing the major electric
switchgear, Protective Function devices, wires, Generators, transformers and other devices,
providing sufficient detail to communicate to a qualified engineer the essential design and safety
of the system being considered.
Special Facilities: As defined in RCMU's Rules governing Special Facilities.
Starting Voltage Drop: The percentage voltage drop at a specified point resulting from In-rush
Current. The Starting Voltage Drop can also be expressed in volts on a particular base voltage,
(e.g., 6 volts on a 120-volt base, yielding a 5% drop).
Supplemental Review: A process wherein RCMU further reviews an Application that fails one
or more of the Initial Review Process steps. The Supplemental Review may result in one of the
following: (a) approval of Interconnection; (b) approval of Interconnection with additional
requirements; or(c)required modifications for interconnection.
System Integrity: The condition under which RCMU's Distribution System is deemed safe and
can reliably perform its intended functions in accordance with the safety and reliability rules of
RCMU.
Resolution No. 2023-100 - Page 7 of 35
Telemetering: The electrical or electronic transmittal of Metering data in real-time to RCMU.
Transfer Trip: A Protective Function that trips a Generating Facility remotely by means of an
automated communications link controlled by RCMU.
Type Test: A test performed on a sample of a particular model of a device to verify specific
aspects of its design, construction and performance.
Unintended Island: The creation of an island, usually following a loss of a portion of RCMU's
Distribution System, without the approval of RCMU.
Unsafe Operating Conditions: Conditions that, if left uncorrected, could result in hard to
personnel, damage to equipment, loss of System Integrity or operation outside pre-established
parameters required by the Interconnection Agreement.
Visible Disconnect: An electrical switching device that can separate the Generating Facility from
the Distribution System and is designed to allow visible verification that separation has been
accomplished. This requirement can be met by opening the enclosure to observe the contact
separation.
C. GENERAL REQUIREMENTS
1. Authorization Required to Operate:
A Producer must comply with this Rule and receive RCMU's express written permission before
Parallel Operation of its Generating Facility with RCMU's Distribution System. RCMU shall
apply this Rule in a non-discriminatory manner and shall not unreasonably withhold its
permission for Parallel Operation of Producer's Generating Facility with RCMU's Distribution
System.
2. Access to Premises:
RCMU may enter Customer's premises without prior notice (a)to inspect, at all reasonable
hours, Customer's protective devices and read or test any meter for the Facility and (b)to
disconnect, at any time, without notice, the Facility if, in RCMU's sole opinion, a hazardous
condition exists and that immediate action is necessary to protect persons, or RCMU's facilities,
or property of others from damage or interference caused by(1) Customer's Facility, or(2)
Customer's failure to comply with the requirements of this Rule.
3. Separate Agreements Required for Other Services:
Producer requiring other electric services from RCMU including, but not limited to, Distribution
Service during periods of curtailment or interruption of the Producer's Generating Facility, will
comply with these Rules and agrees to abide by all requirements as set forth by RCMU for such
services in accordance with RCMU's City Council-approved Electric Rules.
4. Transmission Service Not Provided with Interconnection:
Interconnection with RCMU's Distribution System under this Rule does not provide a Producer
any rights to utilize RCMU's System for the transmission, distribution, or wheeling of electric
power.
5. Design Reviews and Inspections:
Resolution No. 2023-100 - Page 8 of 35
RCMU shall have the right to review the design of a Producer's Generating and/or Interconnection
Facilities and to inspect a Producer's Generating and/or Interconnection Facilities prior to the
commencement of Parallel Operation with RCMU's Distribution System. RCMU may require a
Producer to make modifications as necessary to comply with the requirements of this Rule.
RCMU's review and authorization for Parallel Operation shall not be construed as confirming or
endorsing the Producer's design or as warranting the Generating and/or Interconnection Facilities'
safety, durability or reliability. RCMU shall not, by reason of such review or lack of review, be
responsible for the strength, adequacy or capacity of such equipment.
6. Design Requirements:
a. Customer's Facility, and all portions of it used to provide or distribute electrical power
and parallel interconnection with RCMU's distribution equipment shall be designed,
installed, constructed, operated, and maintained in compliance with this Rule.
Compliance with this section is mandatory.
b. Customer shall conform to all applicable solar or wind electrical generating system
safety and performance standards established by this rule,the National Electrical Code
(NEC), the Institute of Electrical and Electronics Engineers (IEEE), and accredited
testing laboratories such as Underwriters Laboratories, and where applicable, rules of
the Public Utilities Commission regarding safety and reliability, and applicable
building codes.
7. Testing and Compliance:
Generating facilities must meet all applicable safety and performance standards established by the
National Electrical Code, the Institute of Electrical and Electronics Engineers, and accredited
testing laboratories such as Underwriters Laboratories. All generating facilities must have a
warranty of at least 10 years for all equipment and the associated installation from the system
provider (not from RCMU). All major solar system components (including PV panels and other
generation equipment, inverters and meters) must be on the verified equipment list maintained by
the CEC. Any other equipment, as determined by RCMU, must be verified as having safety
certification from a Nationally Recognized Testing Laboratory.
8. Sized to offset all or part of load:
The customer's generating facilities must be sized to offset part or all of the customer's own
electrical requirements and cannot be oversized.
9. Transferability of Generating Facility:
A new customer of record who owns, rents, or leases a premise that includes a generating facility
that was approved by RCMU for parallel operation prior to the new customer moving in and/or
taking electric service with RCMU will take service under this Schedule as long as the
requirements of this Schedule are met. This provision also applies to premises where the
developer/contractor establishes the interconnection.
10. System Modifications:
Existing generating facilities currently under a legacy NEM Schedule that are modified such that:
(1) the generating capacity or output increases by 10% or more; or(2) adding battery storage will
be placed under the most recent NEM Schedule.
Resolution No. 2023-100 - Page 9 of 35
11. NEM Schedule Agreement:
Existing customers under a legacy NEM schedule will remain under their legacy Schedule for a
period of fifteen (15) years from the original year in which their generating facility was
interconnected to RCMU's grid as determined from the date the customer received the permission
to operate (PTO), and then will be switched to the most recent NEM schedule or any otherwise
applicable rate schedule. Existing customers under Schedule NEM can request to be placed under
the most recent NEM Schedule at any time; the customer's account will be trued up at the time of
the request. This means that any outstanding balance due or credit due will be applied to the next
regular billing
12.Interruption or Reduction of Deliveries:
a. RCMU shall not be obligated to accept, and RCMU may require Customer to interrupt
or reduce, deliveries of energy to RCMU: (a) when necessary in order to construct,
install, maintain, repair, replace, remove, investigate, or inspect any of RCMU's
equipment or part of the RCMU system; or (b) if RCMU determines that curtailment,
interruption, or reduction of receipt of energy from Customer's Facility is necessary
because of emergencies, forced outages, force majeure, or compliance with prudent
electrical practices.
b. Notwithstanding any other provision of this Rule, if at any time RCMU, in its sole
discretion, determines that either (a)the Facility may endanger RCMU personnel or
members of the general public, or (b) the continued operation of Customer's Facility
may impair the integrity of RCMU's electric distribution system, RCMU shall have
the right to disconnect Customer's Facility from RCMU's electric distribution system.
Customer's Facility shall remain disconnected until such time as RCMU is satisfied
that the condition(s)referenced in(a) or(b) of this paragraph have been corrected, and
RCMU shall not be obligated to compensate Customer for any loss of use of generation
or energy during any and all periods of such disconnection.
13. Maintenance and Permits:
Customer shall: (a) maintain the Facility and interconnection facilities in a safe and prudent
manner and in conformance with all applicable laws and regulations including, but not limited to,
requirements of Section 5 above, and(b)to the extent that future requirements may require, obtain
any governmental authorizations or permits required for the operation of the Facility. Customer
shall reimburse RCMU for any and all losses,damages,claims,penalties,or liability RCMU incurs
as a result of Customer's failure to obtain or maintain any governmental authorizations and permits
required for construction and operation of the Customer's Facility.
14. Indemnity and Liability by Customer:
a. Customer shall indemnify and hold RCMU, its directors, officers, agents and
employees harmless against all loss, damages expense and liability to third persons for
injury to or death of persons or injury to property caused by the Customer's engineering
design, construction,installation, ownership,maintenance or operations of the Facility
in connection with this Agreement by reason of omission or negligence,whether active
or passive. Customer shall, on RCMU's request, defend any suit asserting a claim
covered by this indemnity. Customer shall pay all costs that may be incurred by RCMU
in enforcing this indemnity.
b. Neither RCMU, its officers, agents nor employees shall be liable for any claims,
demands, costs, losses, causes of action, or any other construction, ownership,
Resolution No. 2023-100 - Page 10 of 35
maintenance or operation of, or making of replacements, additions or betterment to,
Customer's Facility except to the extent actually caused by the sole and gross
negligence of the RCMU.
c. Neither RCMU, its officers, agents nor employees shall be liable for damages of any
kind to the Facility caused by any electrical disturbance of the RCMU system or on the
system of another,whether or not the electrical disturbance results from the negligence
of RCMU.
D. PROTECTION REQUIREMENTS
1. General Interconnection and Protective Function Requirements
The Protective Functions and requirements of this Rule are designed to protect RCMU's
Distribution System and not the Generating Facility.A Producer shall be solely responsible
for providing adequate protection for its Generating Facility and Interconnection Facilities.
The Producer's Protective Functions shall not impact the operation of other Protective
Functions utilized on RCMU's Distribution System in a manner that would affect RCMU's
capability of providing reliable service to its Customers.
a. Protective Functions Required Generating Facilities operating in parallel with
RCMU's Distribution System shall be equipped with the following Protective
Functions to sense abnormal conditions on RCMU's Distribution System and cause the
Generating Facility to be automatically disconnected from RCMU's Distribution
System or to prevent the Generating Facility from being connected to RCMU's
Distribution System inappropriately:
1) Over and under voltage trip functions and over and under frequency trip
functions;
2) A voltage and frequency sensing and time-delay function to prevent the
Generating Facility from energizing a de-energized Distribution System
circuit and to prevent the Generating Facility from reconnecting with
RCMU's Distribution System unless RCMU's Distribution System service
voltage and frequency is within the Voltage Range of 106V to 127V (on a
120V basis), inclusive, and a frequency range of 59.3 Hz to 60.5 Hz,
inclusive, and are stable for at least 60 seconds; and
3) A function to prevent the Generating Facility from contributing to the
formation of an Unintended Island and cease to energize the RCMU's
Distribution System within two seconds of the formation of an Unintended
Island.
The Generating Facility shall cease to energize RCMU's Distribution System for
faults on RCMU's Distribution System circuit to which it is connected. The
Generating Facility shall cease to energize RCMU's Distribution circuit prior to re-
closure by RCMU' Distribution System equipment.
Resolution No. 2023-100 - Page 11 of 35
b. Momentary Paralleling Generating Facilities. With RCMU's approval, the transfer
switch or scheme used to transfer the Producer's loads from RCMU's Distribution
System to Producer's Generating Facility may be used in lieu of the Protective
Functions required for Parallel Operation.
c. Purpose of Protective Functions. The Protective Functions and requirements of this
Rule are designed to protect RCMU's Distribution System and not the Generating
Facility. A Producer shall be solely responsible for providing adequate protection for
its Generating Facility and Interconnection Facilities. The Producer's protective
devices utilized on the Distribution System in a manner that would affect RCMU's
capability of providing reliable service to its Customers.
d. Suitable Equipment Required. Circuit breakers or other interrupting equipment
located at the Point of Common Coupling must be Certified or "Listed" (as defined in
Article 100, the Definitions Section of the National Electrical Code) as suitable for
their intended application. This includes being capable of interrupting the maximum
available fault current expected at their location. Producer's Generating Facility and
Interconnection Facilities shall be designed so that the failure of any single device or
component shall not potentially compromise the safety and reliability of RCMU's
Distribution System.
e. Visible Disconnect Required. When required by RCMU's operating practices, the
Producer shall furnish and install a ganged, manually-operated isolating switch (or a
comparable device mutually agreed upon by RCMU and the Producer) near the Point
of Interconnection to isolate the Generating Facility from RCMU's Distribution
System. The device does not have to be rated for load break nor provide over-current
protection.
The device must:
1) allow visible verification that separation has been accomplished. (This
requirement may be met by opening the enclosure to observe contact
separation.)
2) include markings or signage that clearly indicate open and closed
positions.
3) be capable of being reached quickly and conveniently 24 hours a day by
RCMU personnel for construction, operation, maintenance, inspection,
testing or reading, without obstacles or requiring those seeking access to
obtain keys, special permission, or security clearances.
4) be capable of being locked in the open position.
5) be clearly marked on the submitted single line diagram and its type and
location approved by the RCMU prior to installation. If the device is not
adjacent to the Point of Common Coupling, permanent signage must be
Resolution No. 2023-100 - Page 12 of 35
installed at an RCMU-approved location providing a clear description of
the location of the device.
Generating Facilities with Non-Islanding inverters totaling one (1) kilovolt-ampere
(WA) or less are exempt from this requirement.
f. Drawings Required.Prior to Parallel Operation or Momentary Parallel Operation
of the Generating Facility,RCMU shall approve the Producer's Protective Function
and control diagrams. Generating Facilities equipped with Protective Functions and
a control scheme previously approved by RCMU for system-wide application or
only Certified Equipment may satisfy this requirement by reference to previously
approved drawings and diagrams.
g. Generating Facility Conditions Not Identified. In the event this Rule does not
address the Interconnection conditions for a particular Generating Facility,RCMU
and Producer may agree upon other arrangements.
2. Prevention of Interference:
The Producer shall not operate Generating or Interconnection Facilities that superimpose
a voltage or current waveform upon RCMU's Distribution System that interferes with
RCMU operations, service to RCMU customers, or communication facilities. If such
interference occurs, the Producer must diligently pursue and take corrective action at its
own expense after being given notice and reasonable time to do so by RCMU. If the
Producer does not take corrective action in a timely manner, or continues to operate the
facilities causing interference without restriction or limit, RCMU may, without liability,
disconnect the Producer's facilities from RCMU's Distribution System. To eliminate
undesirable interference caused by its operation, each Generating Facility shall meet the
following criteria:
a. Voltage Regulation:The Generating Facility shall not actively regulate the voltage
at the Point of Common Coupling while in parallel with RCMU's Distribution
System.
b. Operating Voltage Range: The voltage ranges in Table D.1 define protective trip
limits for the Protective Function and are not intended to define or imply a voltage
regulation Function. Generating Facilities shall cease to energize RCMU's
Distribution System within the prescribed trip time whenever the voltage at the
Point of Common Coupling deviates from the allowable voltage operating range.
The Protective Function shall detect and respond to voltage on all phases to which
the Generating Facility is connected.
1) Generating Facilities (30 WA or less). Generating Facilities with a Gross
Nameplate Rating of 30 WA or less shall be capable of operating within
the voltage range normally experienced on RCMU's Distribution System.
Resolution No. 2023-100 - Page 13 of 35
The operating range shall be selected in a manner that minimizes nuisance
tripping between 106 volts and 132 volts on a 120-volt base (88%-110%of
nominal voltage). Voltage shall be detected at either the Point of Common
Coupling or the Point of Interconnection.
2) Generating Facilities(greater than 30 WA). RCMU may require adjustable
operating voltage settings. In the absence of such requirements, the
Generating Facility shall operate at a range between 88% and 110% of the
applicable interconnection voltage. Voltage shall be detected at either the
Point of Common Coupling or the Point of Interconnection, with settings
compensated to account for the voltage at the Point of Common Coupling,
Generating Facilities that are Certified Non-Islanding or that meet one of
the options of the Export Screen (Section I.3.b) may detect voltage at the
Point of Interconnection without compensation.
3) Voltage Disturbances. Whenever RCMU's Distribution System voltage at
the Point of Common Coupling varies from and remains outside normal
(nominally 120 volts) for the predetermined parameters set forth in Table
D-1, the Generating Facility's Protective Functions shall cause the
Generator(s) to become isolated from RCMU's Distribution System:
Table D.1 Voltage Trip Settings
Voltage at Point of Common Coupling Maximum Trip Time* #of Cycles
(Assuming 120 V Base) % of Nominal Voltage (Assuming 60Hz Seconds
Nominal)
Less than 60 Volts Less than 50% 10 Cycles 0.16 Seconds
Greater than or equal to 60 Greater than or equal to 120 Cycles 2 Seconds
volts but less than 106 volts 50% but less than 88%
Greater than or equal to 106 Greater than or equal to Normal Operation
volts but less than 132 volts 88% but less than 110%
Greater than or equal to 132 Greater than or equal to 120 Cycles 2 Seconds
volts but less than 144 volts 110% but less than 120%
Greater than 144Volts Greater than 120% 10 Cycles 0.16 Seconds
* "Maximum Trip time"refers to the time between the onset of the abnormal condition and the Generating
Facility ceasing to energize RCMU's Distribution System. Protective Function sensing equipment and
circuits may remain connected to RCMU's Distribution System to allow sensing of electrical conditions
for use by the "reconnect"feature. The purpose of the allowed time delay is to allow a Generating Facility
to "ride through" short-term disturbances to avoid nuisance tripping. Set points shall not be user
adjustable (though they may be field adjustable by qualifiedpersonnel). For Generating Facilities with a
Resolution No. 2023-100 - Page 14 of 35
Gross Nameplate Rating greater than 30 kVA, setpoints shall be field adjustable and different voltage set
points and trip times from those in Table D.1 may be negotiated with RCMU.
C. Paralleling. The Generating Facility shall parallel with RCMU's Distribution
System without causing a voltage fluctuation at the Point of Common Coupling
greater than f5% of the prevailing voltage level of RCMU's Distribution System
at the Point of Common Coupling.
d. Flicker. The Generating Facility shall not create objectionable flicker for other
customers on RCMU's Distribution System. To minimize the adverse voltage
effects experienced by other customers (IEEE1547-4.3.2), flicker at the Point of
Common Coupling caused by the Generating Facility should not exceed the limits
defined by the "Maximum Borderline of Irritation Curve" identified in IEEE 519-
1992 (IEEE Recommended Practices and Requirements for Harmonic Control in
Electric Power Systems, IEEE STD 519-1992). This requirement is necessary to
minimize the adverse voltage affects experienced by other customers on RCMU's
Distribution System. Generators may be connected and brought up to synchronous
speed (as an induction motor)provided these flicker limits are not exceeded.
e. Integration with RCMU's Distribution System Grounding. The grounding
scheme of the Generating Facility interconnection shall not cause over-voltages
that exceed the rating of the equipment connected to the RCMU's Distribution
System and shall not disrupt the coordination of the ground fault protection on the
RCMU's Distribution System(IEEE1547-4.1.2) (See Section I.31).
f. Frequency: RCMU controls system frequency, and the Generating Facility shall
operate in synchronism with the RCMU's Distribution System. Whenever
RCMU's Distribution System frequency at the Point of Common Coupling is
outside of the acceptable operating range (59.3-60.5 Hertz) for more than ten
cycles, the Generating Facility's Protective Functions shall cease to energize
RCMU's Distribution System.
g. Harmonics. Harmonic distortion shall be in compliance with IEEE 519.
h. Direct Current Injection. Generating Facilities should not inject direct current
greater than 0.5% of rated output current into RCMU's Distribution System.
i. Power Factor. Each Generator in a Generating Facility shall be capable of
operating at some point within a power factor range from 0.9 leading to 0.9 lagging.
Operation outside this range is acceptable provided the reactive power of the
Generating Facility is used to meet the reactive power needs of the Host Loads or
that reactive power is otherwise provided under Rate Schedule by RCMU. The
Producer shall notify RCMU if it is using the Generating Facility for power factor
correction. Unless otherwise agreed upon by the Producer and RCMU, Generating
Facilities shall automatically regulate power factor, not voltage, while operating in
parallel with RCMU's Distribution System.
j. Unintended Islanding. Generating Facilities must mitigate their potential
contribution to an Unintended Island. This can be accomplished by one of the
Resolution No. 2023-100 - Page 15 of 35
following options: (1) incorporating certified Non-Islanding control functions into
the Protective Functions, or (2) installation of non-export relays and protective
equipment or (3) verifying that local loads always sufficiently exceed the Net
Nameplate Rating of the Generating Facility.
k. Fault Detection. A Generating Facility shall be equipped with Protective
Functions designed to detect Distribution System faults,both line-to-line and line-
to-ground, and promptly cease to energize the Distribution System in the event of
a fault. For a Generating Facility that cannot detect these faults within two seconds,
a transfer trip or equivalent function may be required. Reclose-blocking of
RCMU's affected recloser(s) may also be required.
3. Technology Specific Requirements:
a. Three-Phase Synchronous Generators. For three-phase Generators, the Generating
Facility circuit breakers shall be three-phase devices with electronic or
electromechanical control. The Producer shall be responsible for properly
synchronizing its Generating Facility with RCMU's Distribution System by means of
either manual or automatic synchronizing equipment. Automatic synchronizing is
required for all synchronous Generators that have a Short Circuit Contribution Ratio
(SCCR) exceeding 0.05. Loss of synchronism protection is not required except as may
be necessary to meet Section D.2.d (Flicker) (IEEE1547-4.2.5). Unless otherwise
agreed upon by the Producer and RCMU, synchronous Generators shall automatically
regulate power factor, not voltage, while operating in parallel with RCMU's
Distribution System. A power system stabilization function is specifically not required
for Generating Facilities under 10 MW Net Nameplate Rating.
b. Induction Generators. Induction Generators (except self-excited Induction Generators)
do not require a synchronizing Function. Starting or rapid load fluctuations on
induction generators can adversely impact RCMU's Distribution System's voltage.
Corrective step-switched capacitors or other techniques may be necessary and may
cause undesirable ferro-resonance. When these counter measures (e.g., additional
capacitors) are installed on the Producer's side of the Point of Common Coupling,
RCMU must review these measures. Additional equipment may be required as
determined in a Supplemental Review or an Interconnection Study.
c. Inverters. Utility-interactive inverters do not require separate synchronizing
equipment. Non-utility-interactive or "stand-alone" inverters shall not be used for
Parallel Operation with RCMU's Distribution System.
d. Single-Phase Generators. For single-phase Generators connected to a shared single-
phase secondary system, the maximum Net Nameplate Rating of the Generating
Facilities shall be 20 kVA. Generators connected to a center-tapped neutral 240-volt
service must be installed such that no more than 6 kVA of imbalanced power is applied
to the two "legs" of the 240-volt service. For Dedicated Distribution Transformer
services, the maximum Net Nameplate Rating of a single-phase Generating Facility
shall be the transformer nameplate rating.
Resolution No. 2023-100 - Page 16 of 35
E. INTERCONNECTION FACILITIES AND DISTRIBUTION SYSTEM
MODIFICATIONS
1. Scope and Ownership of Interconnection Facilities and Distribution System
Modifications
a. Scope. Parallel Operation of Generating Facilities may require Interconnection
Facilities or modifications to RCMU's Distribution System ("Distribution System
modifications"). The type, extent and costs of Interconnection Facilities and
Distribution System modifications shall be consistent with this Rule and determined
through the Supplemental Review and/or Interconnection Studies described in the
application process.
b. Ownership. Interconnection Facilities installed on Producer's side of the Point of
Common Coupling may be owned, operated and maintained by the Producer or
RCMU. Interconnection Facilities installed on RCMU's side of the Point of Common
Coupling and Distribution System modifications shall be owned, operated and
maintained only by RCMU.
2. Responsibility of Costs of Interconnecting a Generating Facility
a. Review, Study, and Additional Commissioning Test Verification (pre-parallel
inspections) Costs. A producer shall be responsible for the reasonably incurred costs
of the review's studies, and additional Commissioning Test verifications (pre-parallel
inspections) conducted pursuant to the application section of this Rule. If the initial
Commissioning Test verification (pre-parallel inspection) is not successful through no
fault of RCMU, RCMU may impose upon the Producer a cost-based charge for
subsequent Commissioning Test verifications (pre-parallel inspections). All Costs for
additional Commissioning Test verifications(pre-parallel inspections) shall be paid by
Producer within thirty days of receipt of RCMU's invoice.Additional costs,if any,will
be specified on the invoice. If the initial Commissioning test (pre-paralleling
inspection) is not successful through the fault of the RCMU, that visit will not be
considered the initial Commissioning Test(pre-parallel inspection).
b. Facility Costs. A Producer shall be responsible for all costs associated with
Interconnection Facilities owned by the Producer. The Producer shall also be
responsible for any costs reasonably incurred by RCMU in providing, operating, or
maintaining the Interconnection Facilities and Distribution System modifications
required solely for the Interconnection of the Producer's Generating Facility with
RCMU's Distribution System.
c. Separation of Costs. Should RCMU combine the installation of Interconnection
Facilities or Distribution System modifications required for the Interconnection of a
Generating Facility with modifications to RCMU's Distribution System to serve other
Customers or Producers, RCMU shall not include the costs of such separate or
incremental facilities in the amounts billed to the Producer.
3. Installation of Interconnection Facilities and Distribution System Modifications
Resolution No. 2023-100 - Page 17 of 35
a. Agreement Required. The costs for Interconnection Facilities and Distribution
System modifications shall be paid by the Producer pursuant to the provisions
contained in the Interconnection Agreement. Where the type and extent of the
Interconnection Facilities and Distribution System Improvements warrant additional
detail, the detail shall be found in a separate agreement between the Producer and
RCMU, and RCMU's applicable rate schedules and rules for Added Facilities.
b. Interconnection Facilities and Distribution System Modifications. Except as
provided for in Section E.3.c. of this Rule, Interconnection Facilities connected to
RCMU's side of the Point of Common Coupling and Distribution System
modifications shall be provided, installed, owned and maintained by RCMU at
Producer's expense.
c. Third-Party Installations. Subject to the approval of RCMU, a Producer may at its
option employ a qualified contractor to provide and install Interconnection Facilities
or Producer paid Distribution System modifications, to be owned and operated by
RCMU, on RCMU's side of the Point of Common Coupling. Such Interconnection
Facilities and Distribution System modifications shall be installed in accordance with
RCMU's design and specifications. Upon final inspection and acceptance by RCMU,
the Producer shall transfer ownership of such Producer installed Interconnection
Facilities or Distribution System modifications to RCMU and such facilities shall
thereafter be owned and maintained by RCMU. The Producer shall pay RCMU's
reasonable cost of design, administration, and monitoring of the installation for such
facilities to ensure compliance with RCMU's requirements. The Producer shall also be
responsible for all costs associated with the transfer of Producer installed
Interconnection Facilities and Distribution System modifications to RCMU.
F. METERING, MONITORING AND TELEMETRY
1. General Requirements: All Generating Facilities shall be metered in accordance with
this Section F and shall meet all applicable standards of RCMU contained in RCMU's
applicable rules and published RCMU manuals dealing with specifications.
2. Metering By Non-RCMU Parties: The ownership, installation, operation, reading and
testing of revenue Metering Equipment for Generating Facilities shall be by RCMU.
3. Net Generation Output Metering (NGOM): Generating Facilities' customers may be
required to install NGOM for evaluation, monitoring and verification purposes, to satisfy
applicable CAISO reliability requirements, and for Distribution System planning and
operations.
The relevant factors in determining the need for NGOM are as listed below:
a. Data requirements in proportion to need for information;
b. Producer's election to install equipment that adequately addresses RCMU's
operational requirements;
Resolution No. 2023-100 - Page 18 of 35
C. Accuracy and type of required Metering consistent with purposes of collecting
data;
d. Cost of Metering relative to the need for and accuracy of the data;
e. The Generating Facility's size relative to the cost of the Meter/monitoring;
f. Other means of obtaining the data(e.g., Generating Facility logs,proxy data etc.);
g. Requirements under any interconnection Agreement with the Producer.
The requirements in this Section may not apply to Metering of Generating Facilities
operating under RCMU's Net Energy Metering Rate Schedule pursuant to the California
Public Utilities Cod Section 2827, et seq. Nothing in this Section F.3 supersedes Section
B.4.
4. Point of Common Coupling Metering: For purposes of assessing RCMU charges for
retail service, the Producer's PCC Metering shall be a bi-directional meter so that power
deliveries to and from the Producer's site can be separately recorded. Alternately, the
Producer may, at its sole option and cost, require RCMU to install multi-metering
equipment to separately record power deliveries to RCMU's Distribution System and retail
purchases from RCMU.Where necessary, such PCC Metering shall be designed to prevent
reverse registration.
5. Telemetering: If the nameplate rating of the Generating Facility is 1 MW or greater,
Telemetering equipment at the Net Generator Output Metering location may be required
at the Producer's expense. If the Generating Facility is Interconnected to a portion of
RCMU's Distribution System operating at a voltage below 10 kV, then Telemetering
equipment may be required on Generating Facilities 250 kW or greater. RCMU shall only
require Telemetering to the extent that less intrusive and/or more cost effective options for
providing the necessary data in real time are not available.
6. Location: Where RCMU-owned Metering is located on the Producer's premises,Producer
shall provide,at no expense to RCMU,a suitable location for all such Metering Equipment.
7. Costs of Metering: The Producer will bear all costs of the Metering required by this Rule,
including the incremental costs of operating and maintaining the Metering Equipment.
G. DISPUTE RESOLUTION PROCESS
The following procedures will apply for disputes arising from this Rule:
1. The City Council shall have jurisdiction to interpret, add, delete or modify any provision
of this Rule or of any agreements entered into between RCMU and the Producer to
implement this Rate Schedule ("The Implementing Agreements") and to resolve disputes
regarding RCMU's performance of its obligations under its rules, the applicable
agreements, and requirements related to the Interconnection of the Producer's Generating
or Interconnection Facilities pursuant to this Rule.
Resolution No. 2023-100 - Page 19 of 35
2. The dispute shall be submitted in writing by the Producer to RCMU. Authorized
representatives from both Parties shall meet and confer to try to resolve the dispute. If the
Parties cannot resolve the dispute, the dispute will be submitted to the City Council for
resolution. Their decision shall be final.
3. Pending resolution of any dispute under this Section, the Parties shall proceed diligently
with the performance of their respective obligations under this Rule and the Implementing
Agreements, unless the Implementing Agreements have been terminated. Disputes as to
the application and implementation of this Section shall be subject to resolution pursuant
to the procedures set forth in this Section.
H. SYSTEM SIZING REQUIREMENTS
1. Residential Systems
Residential Systems must be designed such that they do not produce more power than they
consume on an annual basis. This means that the estimated output of the generating facility,
using the CEC-AC nameplate rating for inverter-based generating facilities,must not exceed
the customer's previous annual usage in kWh. In the event that there is less than 12 months
of previous recorded usage data, the following equation will be used to determine the
maximum allowable CEC-AC nameplate rating for the inverter-based generating facility in
watts:
1692 * [Number of Dwelling Units] + .75 * [Dwelling conditioned floor area in square feet]
2. Commercial or Industrial Systems
a. Expedited Interconnection
The estimated output of the Generating Facility must not exceed 50% of the customer's
verified annual minimum daytime load. If there is less than 12 months of previous
recorded usage data, the maximum allowable size in watts will be determined by RCMU
through Supplemental Review.
b. Supplemental Review Required
The estimated output of the Generating Facility must not exceed 75% of the customer's
verified annual minimum daytime load and the customer will be installing either battery
storage systems or non-export equipment ensuring that the facility does not export energy
across the Point of Common Coupling. If there is less than 12 months of previous
recorded usage data, the maximum allowable size in watts of the generation system and
amount of required storage will be determined by RCMU during the Supplemental
Review process.
I. APPLICATION AND INTERCONNECTION PROCESS
1. Application Process
a. Applicant Initiates Contact with RCMU. Upon request, RCMU will provide
information and documents (such as requirements, Application, technical
information, listing of Certified Equipment, Initial and Supplemental Review deposit
Resolution No. 2023-100 - Page 20 of 35
information, applicable tariff schedules, Metering requirements and Rules) to a
potential Applicant. Unless otherwise agreed upon, all such information shall
normally be sent to an Applicant within three(3)business days following the initial
request from the Applicant. RCMU will establish an individual representative as the
single point of contact for the Applicant but may allocate responsibilities among its
staff to best coordinate the Interconnection of an Applicant's Generating Facility.
b. Applicant Completes an Application: All Applicants shall complete and file an
Application and supply any relevant additional information requested by RCMU.
Application Fees will be determined in accordance with the fee schedule.
i. Normally, within 10 business days of receiving the Application, RCMU shall
acknowledge its receipt and state whether the Application has been completed
adequately. If defects are noted, RCMU and Applicant shall cooperate in a
timely manner to establish a satisfactory Application.
ii. Fifty Percent of the deposit associated with the Initial Review will be returned
to the Applicant if the Application is rejected by RCMU exactly as submitted
or the Applicant retracts the Application.
iii. The Applicant may propose and RCMU may negotiate specific costs for
processing non-standard applications such as multi-units, multi-sites, or
otherwise as conditions warrant. The fees for the Initial Review and
Supplemental Review contained in the fee schedule do not apply in these
situations.
iv. Applications that are over one year old (from the date of RCMU's
acknowledgement) without a completed application, or a Generating Facility
that has not been approved for parallel operation within one year of completion
of all applicable review and/or studies are subject to cancellation by RCMU;
however, RCMU may not cancel an Application if the Producer provides
reasonable evidence that the project is still active.
c. RCMU Performs Expedited or Supplemental Review
i. Upon receipt of a satisfactorily completed Application and any additional
information necessary to evaluate the Interconnection of a Generating Facility,
RCMU shall perform an Initial Review using the process defined in Section I.
The Initial Review determines if: (a) the Generating Facility qualifies for
Simplified Interconnection; or (b) the Generating Facility requires a
Supplemental Review.
ii. RCMU shall complete its Initial Review, absent any extraordinary
circumstances, within 10 business days after its determination that the
Application is complete. If the Initial Review determines the proposed
Generating Facility can be Interconnected by means of a Simplified
Resolution No. 2023-100 - Page 21 of 35
Interconnection, RCMU will provide the Applicant with an Interconnection
Authorization.
iii. If the Generating Facility does not pass the Initial Review for Simplified
Interconnection as proposed, RCMU will notify the applicant and perform a
Supplemental Review as described in Section I. Applicant shall pay an
additional fee for the Supplemental Review, unless the Application is
withdrawn. The Supplemental Review will result in RCMU providing either:
(a) Interconnection requirements beyond those for a Simplified
Interconnection, and an Interconnection Authorization; or (b) a cost estimate
and schedule for an Interconnection Study. The Supplemental Review shall be
completed, absent any extraordinary circumstances,within 20 business days of
receipt of a completed Application and fees.
2. Interconnection Process
a. Applicant shall comply with the Interconnection Requirements as stated in this Rule.
RCMU shall review with the Applicant all requirements for Interconnection and Net
Energy Metering appropriate for the Applicant's Generating Facility and desired mode
of operation. These requirements are detailed in RCMU's Net Energy Metering and
Generating Facility Interconnection Rules, Terms & Conditions. This rule sets forth
RCMU's and the Applicant's responsibilities, completion schedules, and fixed price or
estimated costs for the required work.
b. Where Applicable (for commercial systems greater than 1MW), RCMU or Producer
Installs Required Interconnection Facilities or Modifies RCMU's Distribution System.
After executing the applicable agreements, RCMU or Producer will commence
construction/ installation of RCMU's Distribution System modifications or
Interconnection Facilities which have been identified in the agreement and application.
The parties will use good faith efforts to meet schedules and estimated costs as
appropriate.
c. Producer Arranges for and Completes Commissioning Testing of Generating Facility
and Producer's Interconnection Facilities. The Producer is responsible for testing new
Generating Facilities and associated Interconnection Facilities according to Section J.5
to ensure compliance with the safety and reliability provisions of this Rule prior to
being operated in parallel with RCMU's Distribution System. For non-Certified
Equipment,the Producer shall develop a written testing plan to be submitted to RCMU
for its review and acceptance. Alternatively, the Producer and RCMU may agree to
have RCMU conduct the required testing at the Producer's expense. Where applicable,
the test plan shall include the installation test procedures published by the manufacturer
of the generation or Interconnection equipment. Facility testing shall be conducted at
a mutually agreeable time, and depending on who conducts the test, RCMU or
Producer shall be given the opportunity to witness the tests.
Resolution No. 2023-100 - Page 22 of 35
d. RCMU Authorizes Parallel Operation or Momentary Parallel Operation. RCMU shall
authorize the Producer's Generating Facility for Parallel Operation or Momentary
Parallel Operation with RCMU's Distribution System, in writing, within 5 calendar
days of satisfactory compliance with the terms of all applicable Rules. Compliance
may include, but not be limited to, provision of any required documentation and
satisfactorily completing any required inspections or tests as described herein or in the
agreements formed between the Producer and RCMU.A Producer shall not commence
Parallel Operation of its Generating Facility with RCMU's system unless it has
received RCMU's express written permission to do so.
e. For Net Energy Metering Generating facilities, RCMU authorization for Parallel
Operation shall normally be provided no later than 30 business days following
RCMU's receipt of 1) a completed Net Energy Metering Application including all
supporting documents and required payments; 2) a completed signed Net Energy
Metering Interconnection Agreement; and 3) evidence of the Producer's final
inspection clearance from the governmental authority having jurisdiction over the
Generating Facility. If the 30-day period cannot be met, the RCMU shall notify the
Applicant and the Commission.
J. REVIEW PROCESS FOR APPLICATIONS TO INTERCONNECT GENERATION
FACILITIES
1. Introduction
This Review Process allows for rapid approval for the interconnection of those Generating
Facilities that do not require an Interconnection Study. The review process includes a
screening to determine if a Supplemental Review is required.
Note: Failure to pass any step of the review process means only that further review and/or
studies are required before the Generating Facility can be approved for Interconnection with
RCMU's Distribution System. It does not mean that the Generating Facility cannot be
Interconnected. Though not explicitly covered in the Initial Review Process the Generating
Facility shall be designed to meet all of the applicable requirements in Section D.
2. Purpose
The review determines the following:
a. If a Generating Facility qualifies for Simplified Interconnection;
b. If a Generating Facility can be made to qualify for Interconnection with a
Supplemental Review determining any additional requirements; or
C. If an Interconnection Study is required, the cost estimate and schedule for
performing the Interconnection Study.
3. Review Process:
Resolution No. 2023-100 - Page 23 of 35
a. If the Application has sufficient data and the design meets the size restrictions for
Residential Service,or Expedited Interconnection for Commercial or Industrial Service
per Section H. The application qualifies for Simplified Interconnection.
b. If the Application is requesting service under any of the additional authorized uses,
RCMU will perform Supplemental Review to provide feedback to the Applicant for
next steps to follow in the Interconnection Process.
K. CERTIFICATION AND TESTING CRITERIA
1. INTRODUCTION
This Section describes the test procedures and requirements for equipment used for the
Interconnection of Generating Facilities to RCMU's Distribution System. Included are
Type Testing, Production Testing, Commissioning Testing and Periodic Testing. The
procedures listed rely heavily on those described in appropriate Underwriters Laboratory
(UL), Institute of Electrical and Electronic Engineers (IEEE), and International
Electrotechnical Commission(IEC) documents—most notably UL 1741 and IEEE 929, as
well as the testing described in May 1999 New York State Public Services Commission
Standardized Interconnection Requirements. As noted in Section A, this rule has been
revised to be consistent with ANSUIEEE 1547-2003 Standard for Interconnecting
Distributed Resources with Electric Power Systems.
The tests described here,together with the technical requirements in Section D of this Rule,
are intended to provide assurance that the Generating Facility's equipment will not
adversely affect RCMU's Distribution System and that a Generating Facility will cease
providing power to RCMU's Distribution System under abnormal conditions. The tests
were developed assuming a low level of Generating Facility penetration or number of
connections to RCMU's Distribution System. At high levels of Generating Facility
penetration, additional requirements and corresponding test procedures may need to be
defined.
Section J also provides criteria for"Certifying" Generators or inverters. Once a Generator
or inverter has been Certified per this Rule, it may be considered suitable for
Interconnection with RCMU's Distribution System. Subject to the exceptions described in
Section J, RCMU will not repeat the design review or require retesting of such Certified
Equipment. It should be noted that the Certification process is intended to facilitate
Generating Facility Interconnections. Certification is not a prerequisite to interconnect a
Generating Facility.
The revisions made to this rule relative to IEEE 1547-2003 have resulted in changes in set
points, test criteria, test procedures, and other requirements that will impact previously
certified or listed equipment as well as equipment currently under evaluation. These
changes were made to provide consistency with IEEE 1547. Equipment that is certified or
that has been submitted to a Nationally Recognized Testing Laboratory(NRTL)for testing
prior to the adoption of the revised Underwriters Laboratories (UL) 1741 titled Inverters,
Converters, Controllers and Interconnection Systems Equipment for use with Distributed
Energy Resources and that subsequently meet the provisions Rule 21 certification
Resolution No. 2023-100 - Page 24 of 35
requirements will continue to be accepted as Certified Equipment for Interconnection
Applications submitted through May 7, 2007, the effective date of the revised UL 1741.
[this change will be incorporated by Advice Letter in Dec. 2005]
2. CERTIFIED AND NON-CERTIFIED INTERCONNECTION EQUIPMENT
a. Certified Equipment
Equipment tested and approved (e.g., "Listed") by an accredited NRTL as having
met both the Type Testing and Production Testing requirements described in this
document is considered to be Certified Equipment for purposes of Interconnection
with RCMU's Distribution System. Certification may apply to either a pre-
packaged system or an assembly of components that address the necessary
functions. Type Testing may be done in the manufactures' factory or test
laboratory, or in the field. At the discretion of the testing laboratory, field-
certification may apply only to the particular installation tested. In such cases,some
or all of the tests may need to be repeated at other installations.
When equipment is certified by a NRTL, the NRTL shall provide to the
manufacturer, at a minimum, a Certificate with the following information for each
device:
Administrative:
1) The effective date of Certification or applicable serial number (range or first
in series), and/or other proof that Certification is current;
2) Equipment model number(s) of the Certified Equipment;
3) The software version utilized in the equipment, if applicable;
4) Test procedures specified (including date or revision number); and
5) Laboratory accreditation (by whom and to what standard).
Technical (as appropriate):
1) Device ratings (kW, kVA, Volts, Amps, etc.);
2) Maximum available fault current in Amps;
3) In-rush Current in Amps;
4) Trip points, if factory set (trip value and timing);
5) Trip point and timing ranges for adjustable settings;
6) Nominal power factor or range if adjustable;
Resolution No. 2023-100 - Page 25 of 35
7) If the equipment is Certified for Non-Exporting and the method used (reverse
power or under power); and
8) If the equipment is Certified Non-Islanding.
It is the responsibility of the equipment manufacturer to ensure that Certification
information is made publicly available by the manufacturer,the testing laboratory or
by a third party.
b. Non-Certified Equipment
For non-Certified Equipment, some or all of the tests described in this Rule may be
required by RCMU for each Generating Facility and/or Interconnection Facilities.
The manufacturer or a laboratory acceptable to RCMU may perform these tests.
Test results for Non-Certified Equipment must be submitted to RCMU for the
Supplemental Review. Approval by RCMU for equipment used in a particular
Generating Facility and/or Interconnection Facilities does not guarantee RCMU's
approval for use in other Generating Facility and/or Interconnection Facilities.
3. TYPE TESTING
a. Type Tests and Criteria for Interconnection Equipment Certification. Type Testing
provides a basis for determining that equipment meets the specifications for being
designated as Certified Equipment under this Rule. The requirements described in
this Section cover only issues related to Interconnection and are not intended to
address equipment safety or other issues.
Table J.1. defines the test criteria by Generator or inverter technology. While UL
17411 was written specifically for inverters,the requirements are readily adaptable
to synchronous Generators, induction Generators, as well as single/multi-function
controllers and protection relays. Until a universal test standard is developed,
RCMU or NRTL shall adapt the procedures referenced in Table J.1 as appropriate
and necessary for a Generating Facility and/or Interconnection Facilities or
associated equipment performance and its control and Protective Functions. The
tests shall be performed in the sequence shown in Table J.2 below.
Resolution No. 2023-100 - Page 26 of 35
Table J.1 Type Tests and Requirements for Interconnection Equipment Certification
Type Test Reference (1) Inverter Synchronous Induction
Generator Generator
Utility Interaction UL 1741—39 X X X
DC Isolation U L 1741—40.1 X - -
Simulated PV Array (Input) UL 1741-41.2 X - -
Requirements
Dielectric Voltage Withstand UL 1741—44 X X X
Power Factor UL 1741—45.2.2 X X X
Harmonic Distortion UL 1741-45.4 X X X
DC Injection UL 1741-45.5 X - -
Utility Voltage and Frequency UL 1741—46.2 X X X
Variation
Reset Delay U L 1741—46.2.3 X X X
Loss of Control Circuit UL 1741—46.4 X X X
Short Circuit UL 1741—47.3 X X X
Load Transfer UL1741-47.7 X X X
Surge Withstand Capability J.3.e X X X
Anti-Islanding J.3.b (2) (2) (2)
Non-Export J.3.c (3) (3) (3)
In-rush Current J.3.d - - (4)
Synchronization J.3.f (5) X (5)
Table Notes: (1) References are to section numbers in either UL 1741 (Inverters, Converters and Charge
Controllers for use in Independent Power Systems) or this Rule. References in UL 1741 to
"photovoltaics" or "inverter" may have to be adapted to the other technologies by the testing
laboratory to appropriately apply in the tests to other technologies.
(2) Required only if Non-Islanding designation
(3) Required only if Non-Export designation is desired.
(4) Required for Generators that use RCMU power to motor to speed.
(5) Required for all self-excited induction Generators as well as Inverters that operate as voltage
sources when connected to RCMU's Distribution System.
X= Required, -= Not Required
Table J.2 Type Tests Sequence for Interconnection Equipment Certification
Type Test
Test No.
1 Utility Voltage and Frequency Variation
2 Synchronization
3 Surge Withstand Capability
4 Utility Voltage and Frequency Variation
5 Synchronization
6 Other Required and Optional Tests
Tests 1, 2, and 3, must be done first and in the order shown.Tests 4
and on follow in order convenient to the test agency.
b. Anti-Islanding Test
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Devices that pass the Anti-Islanding test procedure described in UL 1741 Section
46.3 will be considered Non-Islanding for the purposes of these interconnection
requirements. The test is required only for devices for which a Certified Non-
Islanding designation is desired.
C. Non-Export Test
Equipment that passes the Non-Export test procedure described in Section J.7.a.
will be considered Non-Exporting for the purposes of these Interconnection
requirements. This test is required only for equipment for which a Certified Non-
Export designation is desired.
d. In-rush Current Test
Generation equipment that utilizes RCMU power to motor up to speed will be
tested using the procedure defined in Section J.7.b. to determine the maximum
current drawn during this startup process. The resulting In-rush Current is used to
estimate the Starting Voltage Drop.
e. Surge Withstand Capability Test
The interconnection equipment shall be tested for the surge withstand requirement
in D.Lc in all normal operating modes in accordance with IEEE Std C62.45-2002
for equipment rated less than 1000 V to confirm that the surge withstand capability
is met by using the selected test level(s) from IEEE Std C62.41.2-2002.
Interconnection equipment rated greater than 1000 V shall be tested in accordance
with manufacturer or system integrator designated applicable standards. For
interconnection equipment signal and control circuits, use IEEE Std C37.90.1-
2002. These tests shall confirm the equipment did not fail, did not misoperate, and
did not provide misinformation (IEEE1547-5.1.3.2). The location/exposure
category for which the equipment has been tested shall be clearly marked on the
equipment label or in the equipment documentation. External surge protection may
be used to protect the equipment in harsher location/exposure categories.
f. Synchronization Test
This test is applied to synchronous Generators, self-excited induction generators,
and inverters capable of operating as voltage-source while connected to RCMU's
Distribution System. The test is also applied to the resynchronization Function
(transition from stand-alone to parallel operation) on equipment that provides such
functionality. This test may not need to be performed on both the synchronization
and re-synchronization functions if the manufacturers can verify to the satisfaction
of the testing organization that monitoring and controls hardware and software are
common to both functions. This test is not necessary for induction generators or
current-source inverters. Instead, the In-rush Current test Section J.3.d shall be
applied to those generators.
This test shall demonstrate that at the moment of the paralleling-device closure, all
three synchronization parameters in Table J.3 are within the stated limits. This test
shall also demonstrate that if any of the parameters are outside of the limits stated
in the table, the paralleling-device shall not close (IEEE 1547- 5.1.2A). The test
Resolution No. 2023-100 - Page 28 of 35
will start with only one of the three parameters: (1) voltage difference between
Generating Facility and RCMU's Distribution System; (2) frequency difference; or
(3) phase angle outside of the synchronization specification. Verify that the
Generating Facility is brought within specification prior to synchronization.Repeat
the test five times for each of the three parameters. For manual synchronization
with synch check or manual control with auto synchronization,the test must verify
that paralleling does not occur until the parameters are brought within
specifications.
Table J.3.Synchronization Parameter Limits f17
Aggregate Rating Frequency Voltage Phase Angle
of Generator Units Difference Difference Difference
(kVA) (Of, Hz) (AV, %) (A�,0)
0-500 0.3 10 20
>500-1,500 0.2 5 15
> 1,500-10,000 0.1 3 10
[Y—IEEE 1547-5.1.1 B
g. Paralleling Device Withstand Test
The di-electric voltage withstand test specified in Section J.1 shall be performed on
the paralleling device to ensure compliance with those requirements specified in
Section D.Lc (IEEE 1547-5.1.3.3).
4. Production Testing
As a minimum, each interconnection system shall be subjected to the Utility Voltage
and Frequency Variation Test procedure described in UL1741 under Manufacturing and
Production Tests, Section 68 and the Synchronization test specified in Section J.3.f
Interconnection systems with adjustable set points shall be tested at a single set of set
points as specified by the manufacturer. This test may be performed in the factory or as
part of a Commissioning Test(Section J.5.).
5. Commissioning Testing
a. Commissioning Testing, where required, will be performed on-site to verify
protective settings and functionality. Upon initial Parallel Operation of a
Generating Facility,or any time interface hardware or software is changed that may
affect the functions listed below, a Commissioning Test must be performed. An
individual qualified in testing protective equipment (professional engineer,
factory—certified technician, or licensed electrician with experience in testing
protective equipment) must perform Commissioning Testing in accordance with
the manufacturer's recommended test procedure to verify the settings and
requirements per this Rule.
RCMU may require written Commissioning test procedure be submitted to MVE
at least 10 working days prior to the performance of the Commissioning Test.
RCMU has the right to witness Commissioning Test, RCMU may also require
written certification by the installer describing which tests were performed and
Resolution No. 2023-100 - Page 29 of 35
their results. Protective Functions to be tested during commissioning, particularly
with respect to non-Certified equipment, may consist of the following:
(1) Over and under voltage
(2) Over and under frequency
(3)Anti-Islanding function (if applicable)
(4)Non-Exporting function(if applicable)
(5) Inability to energize dead line
(6) Time delay on restart after utility source is stable
(7)Utility system fault detection(if used)
(8) Synchronizing controls (if applicable)
(9)Other Interconnection Protective Functions that may be required as part of the
Interconnection Agreement
Commissioning Test shall include visual inspections of the interconnection equipment and
protective settings to confirm compliance with the interconnection requirements.
b. Other checks and tests that may need to be performed include:
(1)Verifying final Protective Function settings
(2) Trip test(J.5.f)
(3) In-service tests (J.5.g)
C. Certified Equipment
Generating Facilities qualifying for Simplified Interconnection incorporate
Certified Equipment that have, at a minimum, passed the Type Tests and
Production Tests described in this Rule and are judged to have little or no
potential impact on RCMU's Distribution System. For such Generating Facilities,
it is necessary to perform only the following tests:
(1) Protective Function settings that have been changed after Production
Testing will require field verification. Tests shall be performed using
injected secondary frequencies, voltages and currents, applied waveforms,
at a test connection using a Generator to simulate abnormal utility voltage
or frequency, or varying the set points to show that the device trips at the
measured (actual)utility voltage or frequency.
(2) The Non-Islanding function shall be checked by operating a load break
disconnect switch to verify the Interconnection equipment ceases to
energize RCMU's Distribution System and does not re-energize it for the
required time delay after the switch is closed.
(3) The Non-Exporting function shall be checked using secondary injection
techniques. This function may also be tested by adjusting the Generating
Facility output and local loads to verify that the applicable Non-Exporting
criteria(i.e.,reverse power or underpower) are met.
The Supplemental Review or an Interconnection Study may impose additional
components or additional testing.
d. Non-Certified Equipment
Non-certified Equipment shall be subjected to the appropriate tests described in
Type Testing (Section J.3.) as well as those described in Certified Equipment
Commissioning Tests (Section J.5.c.). With RCMU's approval, these tests may be
performed in the factory, in the field as part of commissioning, or a combination of
both. RCMU, at its discretion, may also approve a reduced set of tests for a
Resolution No. 2023-100 - Page 30 of 35
particular Generating Facility or, for example, if it determines it has sufficient
experience with the equipment.
e. Verification of Settings
At the completion of Commission testing, the Producer shall confirm all devices
are set to RCMU-approved settings. Verification shall be documented in the
Commissioning Test Certification.
f. Trip Tests
Interconnection Protective Functions and devices (e.g. reverse power relays) that
have not previously been tested as part of the Interconnection Facilities with their
associated interrupting devices(e.g. contactor or circuit breaker) shall be trip tested
during commissioning. The trip test shall be adequate to prove that the associated
interrupting devices open when the protective devices operate. Interlocking circuits
between Protective Function devices or between interrupting devices shall be
similarly tested unless they are part of a system that has been tested and approved
during manufacturing.
g. In-service Tests
Interconnection Protective Functions and devices that have not previously been
tested as part of the Interconnection Facilities with their associated instrument
transformers or that are wired in the field shall be given an in-service test during
commissioning. This test will verify proper wiring, polarity, CT/PT ratios, and
proper operation of the measuring circuits. The in-service test shall be made with
the power system energized and carrying a known level of current.A measurement
shall be made of the magnitude and phase angle of each Alternating Current (AC)
voltage and current connected to the protective device and the results compared to
expected values.For protective devices with built-in Metering Functions that report
current and voltage magnitudes and phase angles, or magnitudes of current,
voltage, and real and reactive power, the
metered values may be used for in-service testing. Otherwise,portable
ammeters,voltmeters, and phase-angle meters shall be used.
6. Periodic Testing
Periodic Testing of Interconnection-related Protective Functions shall be performed as
specified by the manufacturer, or at least every four years. All Periodic Tests prescribed by the
manufacturer shall be performed. The Producer shall maintain Periodic Test reports or a log for
inspection by RCMU. Periodic Testing conforming to RCMU test intervals for the particular Line
Section may be specified by RCMU under special circumstances, such as high fire hazard areas.
Batteries used to activate any Protective Function shall be checked and logged once per month for
proper voltage.
Once every four years, the battery must be either replaced or a discharge test performed.
7. Type Testing Procedures Not Defined in Other Standards
This Section describes the additional Type Tests necessary to qualify a device as Certified under
this Rule. These Type Tests are not contained in Underwriters Laboratories UL 1741 Standard
Inverters, Converters and Controllers for Use in Independent Power Systems, or other referenced
standards.
a. Non-Exporting Test Procedures
The Non-Exporting test is intended to verify the operation of relays, controllers and
inverters designed to limit the export of power and certify the equipment as meeting the
Resolution No. 2023-100 - Page 31 of 35
requirements of Screen 2, Options 1 and 2, of the review process. Tests are provided for
discrete relay packages and for controllers and inverters with the intended Functions
integrated.
(1) Discrete Reverse Power Relay Test
This version of the Non-Exporting test procedure is intended for discrete reverse
power and underpower relay packages provided to meet the requirements of
Options 1 and 2 of Screen 2. It should be understood that in the reverse power
application, the relay will provide a trip output with power flowing in the export
(toward RCMU's Distribution System) direction.
Step 1:Power Flow Test at Minimum, Midpoint and Maximum Pickup
Level Settings
Determine the corresponding secondary pickup current for the desired
export power flow of 0.5 secondary watts (the minimum pickup setting,
assumes 5 amp and 120V CT/PT secondary). Apply nominal voltage with
minimum current setting at zero (0) degrees phase angle in the trip
direction. Increase the current to pickup level. Observe the relay's (LCD or
computer display) indication of power values. Note the indicated power
level at which the relay trips. The power indication should be within 2%of
the expected power. For relays with adjustable settings, repeat this test at
the midpoint, and maximum settings. Repeat at phase angles of 90, 180 and
270 degrees and verify that the relay does not operate(measured watts will
be zero or negative).
Step 2:Leading Power Factor Test
Apply rated voltage with a minimum pickup current setting (calculated
value for system application) and apply a leading power factor load current
in the non-trip direction(current lagging voltage by 135 degrees). Increase
the current to relay rated current and verify that the relay does not operate.
For relays with adjustable settings, this test should be repeated at the
minimum,midpoint, and maximum settings.
Step 3:Minimum Power Factor Test
At nominal voltage and with the minimum pickup (or ranges) determined
in Step 1, adjust the current phase angle to 84 or 276 degrees. Increase the
current level to pickup (about 10 times higher than at 0 degrees) and verify
that the relay operates. Repeat for phase angles of 90, 180 and 270 degrees
and verify that the relay does not operate.
Step 4:Negative Sequence Voltage Test
Using the pickup settings determined in Step 1, apply rated relay voltage
and current at 180 degrees from tripping direction, to simulate normal load
conditions (for three-phase relays, use Ia at 180, Ib at 60 and Ic at 300
degrees). Remove phase-1 voltage and observe that the relay does not
operate. Repeat for phases-2 and 3.
Step 5:Load Current Test
Using the pickup settings determined in Step 1, apply rated voltage and
current at 180 degrees from the tripping direction, to simulate normal load
conditions (use Ia at 180, lb at 300 and Ic at 60 degrees). Observe that the
relay does not operate.
Step 6: Unbalanced Fault Test
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Using the pickup settings determined in Step 1, apply rated voltage and 2
times rated current,to simulate an unbalanced fault in the non-trip direction
(use Va at 0 degrees, Vb and Vc at 180 degrees, Ia at 180 degrees, Ib at 0
degrees, and Ic at 180 degrees). Observe that the relay, especially single
phase, does operate properly.
Step 7: Time Delay Settings Test
Apply Step 1 settings and set time delay to minimum setting. Adjust the
current source to the appropriate level to determine operating time, and
compare against calculated values. Verify that the timer stops when the
relay trips. Repeat at midpoint and maximum delay settings.
Step 8:Dielectric Test
Perform the test described in IRCMU 414 using 2 kV RMS for 1 minute.
Step 9: Surge Withstand Test
Perform the surge withstand test described in IEEE C37.90.1.1989 or the
surge withstand capability test described in J.3.e.
(2) Discrete Underpower Relay Test
This version of the Non-Exporting test procedure is intended for discrete
underpower relay packages and meets the requirements of Option 2 of Screen 2. A
trip output will be provided when import power(toward the Producer's load) drops
below the specified level.
Note: For an underpower relay, pickup is defined as the highest power level at
which the relay indicates that the power is less than the set level.
Step 1: Power Flow Test at Minimum, Midpoint and Maximum Pickup
Level Settings
Determine the corresponding secondary pickup current for the desired
power flow pickup level of 5%of peak load minimum pickup setting.Apply
rated voltage and current at 0 (zero) degrees phase angle in the direction of
normal load current. Decrease the current to pickup level. Observe the
relay's (LCD or computer display) indication of power values. Note the
indicated power level at which the relay trips. The power indication should
be within 2% of the expected power. For relays with adjustable settings,
repeat the test at the midpoint, and maximum settings. Repeat at phase
angles of 90, 180 and 270 degrees and verify that the relay operates
(measured watts will be zero or negative).
Step 2:Leading Power Factor Test
Using the pickup current setting determined in Step 1, apply rated voltage
and rated leading power factor load current in the normal load direction
(current leading voltage by 45 degrees). Decrease the current to'145% of
the pickup level determined in Step 1 and verify that the relay does not
operate. For relays with adjustable settings,repeat the test at the minimum,
midpoint, and maximum settings.
Step 3:Minimum Power Factor Test
At nominal voltage and with the minimum pickup (or ranges) determined
in Step 1, adjust the current phase angle to 84 or 276 degrees. Decrease the
current level to pickup(about 10%of the value at 0 degrees)and verify that
the relay operates. Repeat for phase angles 90, 180 and 270 degrees and
verify that the relay operates for any current less than rated current.
Resolution No. 2023-100 - Page 33 of 35
Step 4:Negative Sequence Voltage Test
Using the pickup settings determined in Step 1, apply rated relay voltage
and 25%of rated current in the normal load direction,to simulate light load
conditions. Remove phase 1 voltage and observe that the relay does not
operate. Repeat for Phases-2 and 3.
Step S: Unbalanced Fault Test
Using the pickup settings determined in Step 1,apply rated voltage and two
times rated current, to simulate an unbalanced fault in the normal load
direction (use Va at 0 degrees, Vb and Vc at 180 degrees, Ia at 0 degrees,
lb at 180 degrees, and Ic at 0 degrees). Observe that the relay (especially
single-phase types) operates properly.
Step 6: Time Delay Settings Test
Apply Step 1 settings and set time delay to minimum setting. Adjust the
current source to the appropriate level to determine operating time, and
compare against calculated values. Verify that the timer stops when the
relay trips. Repeat at midpoint and maximum delay settings.
Step 7:Dielectric Test
Perform the test described in IEC 414 using 2 kV RMS for 1 minute.
Step 8: Surge Withstand Test
Perform the surge withstand test described in IEEE C37.90.1.1989 or the
surge withstand test described in Section J.3.e.
(3) Tests for Inverters and Controllers with Integrated Functions
Inverters and controllers designed to provide reverse or underpower functions shall
be tested to certify the intended operation of this function. Two methods are
acceptable:
Method 1: If the inverter or controller utilizes external current/voltage
measurement to determine the reverse or underpower condition, then the inverter
or controller shall be functionally tested by application of appropriate secondary
currents and potentials as described in the Discrete Reverse Power Relay Test,
Section J.7.a.(1) of this Rule.
Method 2: If external secondary current or voltage signals are not used, then unit-
specific tests must be conducted to verify that power cannot be exported across the
PCC for a period exceeding two seconds. These may be factory tests, if the
measurement and control points are integral to the unit, or they may be performed
in the field.
b. In-rush Current Test Procedures
This test will determine the maximum In-rush Current drawn by the Generator.
(1) Locked-Rotor Method
Use the test procedure defined in NEMA MG-1 (manufacturer's data is acceptable
if available).
(2) Start-up Method
Install and setup the Generating Facility equipment as specified by the manufacturer. Using a calibrated
oscilloscope or data acquisition equipment with appropriate speed and accuracy,measure the current draw
at the Point of Interconnection as the Generating Facility starts up and parallels with RCMU's Distribution
System. Startup shall follow the normal, manufacturer-specified procedure. Sufficient time and current
resolution and accuracy shall be used to capture the maximum current draw within 5%. In-rush Current is
Resolution No. 2023-100 - Page 34 of 35
defined as the maximum current draw from RCW during the startup process, using a 10-cycle moving
average. During the test, the utility source, real or simulated, must be capable of maintaining voltage
within +/- 5% of rated at the connection to the unit under test. Repeat this test five times. Report the
highest 10-cycle current as the In-rush Current. A graphical representation of the time-current
characteristic along with the certified In-rush Current must be included in the test report and made
available to RCW.
Resolution No. 2023-100 - Page 35 of 35