105 degrees C for engine-generator sets expected to
operate 300 hours or greater per year or rated 300
kW and above.
3. Select 2/3 pitch design option for
engine-generator sets rated 300 kW and above.
4. Select 10-12 lead reconnectable for
engine-generator sets rated 300 kW to 800 kW.
5. For applications requiring high SCR loading or
in harsh environments laden with salts and
chemicals, select vacuum pressure impregnation (VPI)
insulated coils. When engine-generator sets are
rated 800 kW and larger, also select form wound
coils.
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Provide salient-pole type, ac, brushless-excited, revolving field,
air-cooled, self-ventilated,[ dripproof guarded,] coupled type, synchronous
generator conforming to NEMA MG 1, Part[ 16][ 22], NEMA C50.10, and NEMA
C50.12. Generator shall be rated for[ standby][ continuous] duty at 100
percent of the power rating of the engine-generator set as specified in
paragraph entitled "Engine-Generator Set Ratings and Performance."
Temperature rise of each of the various parts of the generator shall not
exceed[ 130][ 105] degrees C as measured by resistance, based on a maximum
ambient temperature of 40 degrees C. Winding insulation shall be Class H.
a.
Stator: Stator windings shall be[ 2/3 pitch design][,][ 10-12 lead
reconnectable][ with VPI insulated[ and form wound] coils].
b.
Rotor:
The rotor shall have connected amortisser windings.
c.
Generator Space Heater: Provide[ 120][ _____] volt ac heaters. Heater
capacity shall be as recommended by the generator manufacturer to aid
in keeping the generator insulation dry.
d.
Grounding: Provide non-corrosive steel grounding pads located at two
opposite mounting legs.
e.
Filters: Provide manufacturer's standard generator cooling air filter
assembly.
2.1.3.2
Excitation System
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NOTE: Select all options for engine-generator sets
rated 300 kW and above.
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Provide a brushless excitation system consisting of an exciter and rotating
rectifier assembly[, and permanent magnet generator] integral with the
generator and a voltage regulator. Insulation class for parts integral
with the generator shall be as specified in paragraph entitled "Generator."
System shall provide a minimum short circuit of 300 percent rated
engine-generator set current for at least 10 seconds. Steady state voltage
regulation shall be in accordance with the operating limit values of the
performance class specified in the paragraph entitled "Performance Class."
SECTION 16237N
Page 23
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