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Sequence of Operation (Parallel)

The following instructions describe the procedures to be followed for paralleling generators on an isolated

bus. These procedures should be completely reviewed and understood before paralleling is attempted.
a.  Start generator set #1.
b.  Close the circuit breaker to connect the generator to the bus.
c.  Adjust the voltage and frequency of generator set #1 to nominal.
d.  Apply load. If possible, load should be 10% or more of its kW rating.
e.  Start generator set #2.
f.  Adjust the voltage of the generator to nominal.
g.  Adjust the speed of generator set #2 slightly higher than that of generator set #1.
h.  Observing the synchroscope (or lights), close the circuit breaker (generator set #2) when the set is in

phase with generator set #1.

i. Immediately after closing the breaker, verify the indication on the ammeter for generator set #2. They

should read well within the rating of the generator. If they do not, stop the system and refer to the

Troubleshooting

chapter. If unstable operation is indicated, see

Parallel Operation

above. If operation

is stable, see the next step.

j. Adjust the speed of generator set #2 to the point where each set is carrying the desired share of kW

load.

k. Adjust the voltage of generator set #2 until the ammeter reading of both sets is near minimum.
l. If kvar or power factor meters are available, adjust the voltage-adjust rheostat for equal or

proportional kvar or power factor reading.

m. If the sets are equipped with power factor meters instead of kW meters, alternately adjust the speed

and voltage on generator set #2 until the ammeter readings are proportional and the power factor

readings are equal.

Note

To obtain the best results, final adjustments should be made with full

load on the bus.

n. With full load applied, readjust the speed and voltage on generator set #2 until the desired load

division is obtained.

The best adjustment is obtained when both sets are supplying the same percent of rated current, the kW

(or power factor) readings are equal, or the sum of the ammeter currents of the two sets is minimum.
Upon closing the circuit breaker for generator set #2 (

Sequence of Operation

above), improper operation

may result. This condition may be accompanied by a very high ammeter reading, the circuit breaker may

open due to current overload, or it may be opened by the reverse power relay. In order to isolate this

problem to the faulty speed or voltage regulating system, perform the following steps:
a. Parallel the generators as instructed in

Sequence of Operation

, steps a through h.

b. Immediately after closing the circuit breaker, observe the kW and kvar, or power factor meters. The

following conditions may occur:

1. A high ammeter reading accompanied by a large kW unbalance. When this condition

exists, the speed regulating system is faulty.

2. A high ammeter reading accompanied by a kvar or power factor unbalance but a