Transmittal of generator prepurchase specifications, March 1998

NYC 9/11 Public Portal Document

PPS-Generators

c. Operate unit from 0 to 100 percent load, starting, at no load and increasing in u^rements of 25 percent then decreasing from 100 to 0 percent load in 25 percent increments. Hold at each incremental load for 10 minutes and check at each load point for suble operation, fuel consumption, engine performance, and generator performance. Each generator set shall be capable of returning to its rated voltage and frequency within 5 seconds with a maximum voltage drop of 20% when incremental loads are added.

d. Operate each unit from 0 to 100 percent load, with the following increments: 0% to 50%, 50% to 0%, 25% to 75%, 75% to 25%, 0% to 100%, 100% to 0%. Hold at each incremental load for 10 minutes and check for stable operation. The generator set shall be capable of returning to its rated voltage and frequency within 5 seconds with a maximum voltage drop of 25% when full load is added.

e. Perform full load transient tests verifying that kilowatts, voltage, amperes, and frequency transient characteristics, are within acceptable limits. Submit 3 phase oscillograph tracings of all transient tests and of paralleling operation.

f. Check engine fuel system and water cooling system for possible leaks during the load test. If any fuel or water leaks are observed, the unit must be stopped and the leaking item shall be tightened or replaced as required, and the load test shall be restarted.

g- Deliberately speed up the engine by misadjusting the governor and record the speed at which the engine automatically shuts down.

h. Simulate low oil pressure by shorting the contacts of the oil pressure relay, to test for automatic engine shutdown on low oil pressure.

1. Simulate high water temperature by shorting the contacts of the water temperature relay to test for automatic engine shutdown on high water temperature.

j- The load bank used for this test shall be 50% resistive and 50% non­ linear.

2. After successful test the unit shall be broken down into 3 major components (engine, generator, radiator) for shipment and installation at job site. The base shall be cut for delivering and welding together at site.

OEM PPS-18 Generators 7 WTC March 20, 1998

NYC-WTC_000166893