Transmittal of generator prepurchase specifications, March 1998

NYC 9/11 Public Portal Document

PPS-Generators

» 1. In response to a "cranking” signal from the generator control switchgear, all engine generator sets shall be automatically started, synchronized and paralleled, and shall pick up and divide all "first priority" loads in stages within 10 seconds. All second priority loads shall be picked up in stages within 15 seconds.

2. Load handling capability to be such as to permit the specified load to be carried for 350 consecutive hours without trouble or damage.

3. Each generator shall be designed to carry its load with a lull load temperature rise, as measured by resistance, of not more than 80° over a 40°C ambient temperature. Limitations on the maximum allowable sub-transient reactance as specified herein may result in a full load temperature rise less than 80°C. The generator shall have a sub-transient reactance of less than 12% (at its specified full load rating) as derived by re-rating the reactance down from the sub-transient reactance based on the generator 130°C KW rating.

4. Speed governor operation such that at any fixed operating temperature variation from any manually selected speed shall be zero for any steady state load from no load up to specified load conditions.

5. Voltage regulation to be such as to permit a setting of the manual voltage adjustment device hereinafter specified which will maintain the output voltage within a range of plus or minus 1/2% of nominal for any steady state load from on load up to the specified load conditions.

6. Stable operation to be such that for any particular steady state load (between no load and the specified load conditions) the steady state frequency deviation shall not exceed ±1/4%.

7. Stable operation to be such that for any particular steady state load (between no load and the specified load conditions) the steady stale voltage deviation shall not exceed ±%%.

8. Surge handling capability to be such as to permit a one step application of a load whose "KW" is 100% of the specified generator set rating, without casing the engine to stall.

9, Voltage transient deviation shall be 20 percent maximum from rated generator terminal voltage on one step application or removal of full load when generator is driven by diesel engine.

OEM PPS-IO Generators 7 WTC March 20, 1998

NYC-WTC_000166885