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6-2 Parallel operation
(1) Turn off the breakers on the load side.
(2) Start engine and keep it in warming up.
(3) Equalize all the voltages and frequencies
on the units by adjusting the voltage regulator
and the speed regulator.
(4) First turn on the circuit breaker on the
No.1 generating set.
(5) Adjust the speed regulator on the No.2 set so
that the two synchronizing lamp on the No.2
set turn on and off at the same time when the
two phase sequences are in the same direction,
while the two turn on and off alternately when the
sequences are in the different direction.
In case the two lamps turn on and off alternately,
recheck the cable connections for correct phase
sequence.
(6) At the instance when the synchronizing lamps
on No.2 set turn off, turn the No.2 set breaker on.
[Note]
The generators can be damaged due to short circuit
current if the breaker is turned on when the synchronizing
lamps are still on.
(7) Upon the above procedure, the No.1 and No.2
sets are in parallel operation. The AC ammeters
are supposed to indicate zero in this no load condition.
If the meters indicate some current, it is an
uneffective cross current due to voltage difference.
Make it zero by adjusting the voltage regulator.
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