MI L-DTL-53133/ 6B
3.20 Voltage drift. With the set operating at constant load and frequency, a change
in ambient temperature up to 33 C° (60 F° ) in an 8-hour period shall not cause the
voltage to change by more than 2 percent, set temperature stabilization being
accomplished at both the initial and final ambient temperature conditions.
3.21 Voltage transient performance. Performance of the set under transient
conditions (as measured by an oscillograph) shall be as follows (reactive droop
compensation of the voltage regulator being inoperative):
a. With the set initially operating at no load, rated voltage, rated frequency, the
terminal voltage of the set shall not drop to less than 75 percent of no load
voltage when a balanced 3-phase, 0.4 pf (or less) lagging, static load having an
impedance of 0.5 per unit, is suddenly applied to the output terminals of the
set. When connected to the specified load, the output voltage shall recover to
a minimum of 95 percent of rated voltage within 0.7 seconds and shall stabilize
at or above this voltage. The above specified voltage dip shall not be exceeded
when a fully-loaded induction motor of the above specified impedance is used
in place of a static load, and no reactions shall be set up to prevent full
acceleration of the motor with rated torque applied to its shaft.
b. When the set is initially operating at rated frequency, and rated voltage, and
following any sudden change in load from no load to rated load, the
instantaneous voltage shall not drop to less than 88 percent of rated voltage
and shall reach stable conditions within 0.5 seconds; no overshoot or
undershoot of the final voltage shall not exceed the initial voltage transient in
amplitude. The above requirements shall also apply when the load is suddenly
changed from rated load to no load, except that the initial voltage transient
shall not exceed 112 percent of rated voltage.
c. The generator set shall be capable of across-the-line starting a motor rated at 1
horsepower per kW of set kW rating. The starting current rating of the motor
shall be NEMA Code F and the motor shall be loaded with a flywheel having an
inertia equal to that of the motor rotor.
3.22 Voltage adjustment range. The minimum voltage adjustment range shall be:
Voltage Connection
Range
197 to 229 volts
120/ 208 V
240/ 416 V
395 to 458 volts
5
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