d.
Repeat steps a. through c. two additional times without making any
adjustments.
3.5.6.3
Voltage Regulator Range Test
a.
While operating at no load, verify that the voltage regulator
adjusts from 90% to 110% of rated voltage.
b.
Increase load to 100% of Rated Output Capacity. Verify that the
voltage regulator adjusts from 90% to 110% of rated voltage.
3.5.6.4
Governor Adjustment Range Test
a.
While operating at no load, verify that the governor adjusts from
90% to 110% of rated frequency.
b.
Increase load to 100% of Rated Output Capacity. Verify that the
governor adjusts from 90% to 110% of rated frequency.
3.5.6.5
Frequency and Voltage Stability and Transient Response
**************************************************************************
NOTE: For applications where the Maximum Step Load
Increase is 100%, delete steps d, e, and f.
**************************************************************************
Verify that the engine-generator set responds to addition and dropping of
blocks of load in accordance with the transient response requirements.
Document maximum voltage and frequency variation from bandwidth and verify
that voltage and frequency return to and stabilize within the specified
bandwidth, within the specified response time period. Document results in
tabular form and with high resolution, high speed strip chart recorders or
comparable digital recorders, as approved by the Contracting Officer.
Tabular data shall include the following:
(1.)
Ambient temperature (at 15 minute intervals).
(2.)
Generator output current (before and after load changes).
(3.)
Generator output voltage (before and after load changes).
(4.)
Frequency (before and after load changes).
(5.)
Generator output power (before and after load changes.
(6.) Graphic representations shall include the actual instrument
trace of voltage and frequency showing:
Charts marked at start of test; observed steady-state band; mean
of observed band; momentary overshoot and undershoot (generator
terminal voltage and frequency) and recovery time for each load
change together with the voltage and frequency maximum and minimum
trace excursions for each steady state load condition prior to and
immediately following each load change. Generator terminal
voltage and frequency transient recovery time for each step load
increase and decrease.
a.
Perform and record engine manufacturer's recommended prestarting
checks and inspections.
SECTION 16263A
Page 83
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