power exchange, reactive power division, and voltage and frequency
stability and transient response in the following steps for each
combination.
a.
Divide the load proportionally between the sets and operate in
parallel for 15 minutes.
b.
Increase the load, in steps equal to the Maximum Step Increase,
until each set is loaded to its service load.
c.
Decrease the load, in steps equal to the Maximum Step Decrease,
until each set is loaded to approximately 25% of its service load.
d.
Increase the load, in steps equal to the Maximum Step Increase,
until each set is loaded to approximately 50% of its service load
Verify stabilization of voltage and frequency within specified
bandwidths and proportional sharing of real and reactive load.
e.
Reduce the sum of the loads on both sets to the output rating of
the smaller set.
f.
Transfer a load equal to the output rating of the smaller of the 2
sets to and from each set. Verify stabilization of voltage and
frequency within specified bandwidths and proportional sharing of
real and reactive load.
g.
Document the active power division, active power exchange,
reactive power division, and voltage and frequency stability and
transient response .
3.5.7.2
Multiple Combinations
Connect each set, while operating at no load, parallel with all multiple
combinations of all other set in the system, while operating at service
load, until all multiple combinations of parallel operations have been
achieved.
3.5.8
Parallel Operation Test (Commercial Source)
**************************************************************************
NOTE: Delete the parallel to commercial source test
if sets are not to be paralleled with the commercial
power source.
**************************************************************************
Connect each set parallel with the commercial power source. Operate in
parallel for 15 minutes. Verify stabilization of voltage and frequency
within specified bandwidths. Record the output voltage, frequency, and
loading to demonstrate ability to synchronize with the commercial power
source.
3.5.9
Automatic Operation Tests for Multiple Engine Generator Set Parallel
Operation In Standalone Mode
**************************************************************************
NOTE: Delete automatic operation test where not
required. Adapt this paragraph based on the number
of engine-generator sets, the desired starting
order, and load sequencing. The designer will
SECTION 16263A
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