Transmittal of generator prepurchase specifications, March 1998

NYC 9/11 Public Portal Document

PPS-Generators

2) Check - In this position, the synchronizer is fully operational J except it cannot close the generator breaker. The phase-lock feature holds the generator output in synchronism with the bus.

3) . Off - In this position, the synchronizer is turned off to allow for manual paralleling at the Master Cubicle.

4) Run - In this position, the fiilly operational automatic mode.

e. Failure to Synchronize Reset Switch

1) A momentary pushbutton switch shall be provided to reset the "fail to synchronize" alarm.

f. Current Transformers

Current transformers shall be furnished with V > A > burden ratings suitable to supply the metering, protective devices and electronic governor without affecting their accuracy. Ratios shall be selected to cause ammeter scale deflection to the top 25 % of scale at the full load rating of the engine generator when computed at 0.8 pf.

1) All current transformers shall have shorting type terminal blocks.

g- Potential Transformers

Potential transformers shall be provided in turns ratio and VA burden rating to be compatible with the controls, metering and the electronic governor. Transformers shall have primary and secondary fuses.

h. Engine Governor, Generator Voltage Regulator and Miscellaneous Engine Generator Set Controls

Engine Generator Set Controls

The switchgear manufacturer, shall mount and wire all electronic and electric controls associated with the engine generator set governor and/or voltage regulator as described in the engine generator set specifications. These controls shall be furnished by the engine generator set distributor to the switchgear manufacturer for mounting and wiring. The controls will include, but not be limited to the following:

1) Electronic control portion of governor.

OEM PPS-42 Generators 7 WTC March 20, 1998

NYC-WTC_000166917