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the line current kVAR of the generator. The readings must be within
the rating of the unit. A high ammeter reading accompanied by a large
kW reading indicates faulty governor control. A high ammeter reading
accompanied by a large kVAR unbalance indicates problems with the
voltage regulator. Adjusting the cross current or voltage droop rheostat
should improve the sharing of kVAR.
To shut down the generator operating in parallel, gradually reduce the
kW load by using the governor to reduce speed. When kW load and
line current approach 0, open the generator circuit breaker. Operate
the generator unloaded for several minutes to dissipate the heat in the
windings. Refer to the prime mover manual for shutdown and cool-down
procedures.
Figure 20: Guide to allowable phase unbalance
0
20
40
60
80
100
20
40
60
80
100
Max. current in any phase (% of rated)
Min. current in any phase (% of rated)
Excessive
unbalance
Allowable
unbalance
System bus
Figure 21: Synchronizing paralleled generators with test lamps
Load lines from the incoming generator
Load
switch
Synchronizing
lamps
