PROTOTYPE TEST SUPPORT (PTS)
50 HZ TEST SUMMARY
GENERATOR SET MODELS REPRESENTATIVE PROTOTYPE
C175 D5e C220 D5e
C200 D5e Model: C220 D5e
Engine: QSB7-G5
Alternator: UCD274J
The following summarizes prototype testing conducted on the designated representative prototype of the specified models. This testing
is conducted to verify the complete generator set electrical and mechanical design integrity. Prototype testing is conducted only on
generator sets not sold as new equipment.
Maximum Surge Power: 188 kW Steady State Performance:
The generator set was evaluated to determine the stated The generator set was tested to verify if the steady state operating
maximum surge power. performance was within the specified maximum limits.
Voltage Regulation: ± 0.5%
Maximum Motor Starting: 865 kVA Random Voltage Variation: ± 0.5%
The generator set was tested to simulate motor starting by Frequency Regulation: Isochronous
applying the specified kVA load at low lagging power factor (0.4 or Random Frequency Variation: ± 0.25%
lower). With this load applied, the generator set recovered to a
minimum of 90% rated voltage. Transient Performance:
The generator set was tested to verify single step loading
Alternator Temperature Rise: capability as required by NFPA 110 and verify acceptable voltage
The highest rated temperature rise ( 163°C ) test results are and frequency response on load addition or rejection.
reported as follows to verify that worst case temperature rises do The following results were recorded at 1.0 power factor :
not exceed allowable NEMA MG1 limits for class H insulation.
Tests were conducted per IEEE 115, rise by resistance and Full Load Acceptance:
embedded detector, with the rated voltages. Only the highest Voltage Dip: 31.3 %
temperatures are reported. Recovery Time: 5.49 sec
Frequency Dip: 20.41 %
Location: Maximum Rise (°C) Recovery Time: 5.49 sec
Alternator Stator: 163 Full Load Rejection:
Alternator Rotor: 163 Voltage Rise: 6.78 %
Exciter Stator: 163 Recovery Time: 2.37 sec
Exciter Rotor: 163 Frequency Rise: 7.89 %
Recovery Time: 0.85 sec
Torsional Analysis and Testing:
The generator set was tested to verify that the design is not Harmonic Analysis:
subjected to harmful torsional stresses. (per MIL-STD-705B, Method 601.4)
A spectrum analysis of the transducer output was conducted Line to Line Line to Neutral
over the speed range of 1350 to 2250 RPM. Harmonic No Load Full Load No Load Full Load
3 NA NA NA NA
Cooling System: 50 °C Ambient 5 NA NA NA NA
0.5 in. H2O restriction 7 NA NA NA NA
The cooling system was tested to determine ambient temperature 9 NA NA NA NA
and static restriction capabilities. The test was performed at full 11 NA NA NA NA
rated load in elevated ambient temperature under static restriction 13 NA NA
NA NA
conditions.
15 NA NA NA NA
Durability: Electrical and Mechanical Strength:
The generator set was tested to several single phase and three
The generator set was subjected to a minimum 500 hour phase faults to verify that the generator can safely withstand the
endurance test operating at variable load up to the standby rating forces associated with short circuit conditions. The generator set
based upon MIL-STD-705 to verify structural soundness and was capable of producing full rated output at the conclusion of the
durability of the design. testing.
Cummins Power Generation Specification May Change Without Notice pts-600a
