| type or stand-alone type shall be used in parallel
with the utility system only with synchronizing equipment. Direct-current
generation shall not be operated in parallel with the utility system.
(3) Protective function requirements. The protective function
requirements for three phase facilities of different size and technology are
listed below.
(A) Facilities rated ten kilowatts (kW) or less must have an
interconnect disconnect device, a generator disconnect device, an over-voltage
trip, an under-voltage trip, an over/under frequency trip, and a manual or
automatic synchronizing check (for facilities with stand alone capability).
(B) Facilities rated in excess of 10 kW but not more than 500
kW must have an interconnect disconnect device, a generator disconnect device,
an over- voltage trip, an under-voltage trip, an over/under frequency trip,
a manual or automatic synchronizing check (for facilities with stand alone
capability), either a ground over-voltage trip or a ground over-current trip
depending on the grounding system if required by the company, and reverse
power sensing if the facility is not exporting (unless the generator is less
than the minimum load of the customer).
(C) Facilities rated more than 500 kW but not more than 2,000
kW must have an interconnect disconnect device, a generator disconnect device,
an over- voltage trip, an under-voltage trip, an over/under frequency trip,
either a ground over-voltage trip or a ground over-current trip depending
on the grounding system if required by the company, an automatic synchronizing
check (for facilities with stand alone capability) and reverse power sensing
if the facility is not exporting (unless the facility is less than the minimum
load of the customer). If the facility is exporting power, the power direction
protective function may be used to block or delay the under frequency trip
with the agreement of the utility.
(D) Facilities rated more than 2,000 kW but not more than 10,000
kW must have an interconnect disconnect device, a generator disconnect device,
an over- voltage trip, an under-voltage trip, an over/under frequency trip,
either a ground over-voltage trip or a ground over-current trip depending
on the grounding system if required by the company, an automatic synchronizing
check and AVR for facilities with stand alone capability, and reverse power
sensing if the facility is not exporting (unless the facility is less than
the minimum load of the customer). If the facility is exporting power, the
power direction protective function may be used to block or delay the under
frequency trip with the agreement of the utility. A telemetry/transfer trip
may also be required by the company as part of a transfer tripping or blocking
protective scheme.
(f) Facilities not identified. In the event that standards
for a specific unit or facility are not set out in this section, the company
and customer may interconnect a facility using mutually agreed upon technical
standards.
(g) Requirements specific to a facility paralleling for sixty
cycles or less (closed transition switching). The protective devices required
for facilities ten MW or less which parallel with the utility system for 60
cycles or less are an interconnect disconnect device, a generator disconnect
device, an automatic synchronizing check for generators with stand alone capability,
an over-voltage trip, an under-voltage trip, an over/under frequency trip,
and either a ground over-voltage trip or a ground over-current trip depending
on the grounding system, if required by the utility.
(h) Inspection and start-up testing. The customer shall provide
the utility with notice at least two weeks before the initial energizing and
start-up testing of the customer's generating equipment and the utility may
witness the testing of any equipment and protective systems associated with
the interconnection. The customer shall revise and re-submit the application
with information reflecting any proposed modification that may affect the
safe and reliable operation of the utility system.
(i) Site testing and commissioning. Testing of protection systems
shall include procedures to functionally test all protective elements of the
system up to and including tripping of the generator and interconnection point.
Testing will verify all protective set points and relay/breaker trip timing.
The utility may witness the testing of installed switchgear, protection systems,
and generator. The customer is responsible for routine maintenance of the
generator and control and protective equipment. The customer will maintain
records of such maintenance activities, which the utility may review at reasonable
times. For generation systems greater than 500 kW, a log of generator operations
shall be kept. At a minimum, the log shall include the date, generator time
on, and generator time off, and megawatt and megavar output. The utility may
review such logs at reasonable times.
(j) Metering. Consistent with Chapter 25, Subchapter F of this
title (relating to Metering), the utility may supply, own, and maintain all
necessary meters and associated equipment to record energy purchases by the
customer and energy exports to the utility system. The customer shall supply
at no cost to the utility a suitable location on its premises for the installation
of the utility's meters and other equipment. If metering at the generator
is required in such applications, metering that is part of the generator control
package will be considered sufficient if it meets all the measurements criteria
that would be required by a separate stand alone meter.
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