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6. Parallel operation
[Note]
This section is to explain only the procedures for parallel operation that are different
from the general single unit operation. For the same procedures with those for single
unit operation, read「4. Connecting the load 」and「5. Operation 」.
In the case where the required load capacity exceeds the generator capacity, the parallel
operation is useful by paralleling electrically generators of 2 units or more. However, note
that the stable parallel operation requires the equality of output voltages, frequencies,
engine governor characteristics, etc. For this reason, it is requested for easy paralleling to
select the same model of the generating sets.
Study this manual carefully before paralleling the units.
6-1 Preparation for parallel operation
(1) Turn off the main circuit breakers on all the units, and stop the engines.
(2) Set the voltage selector switch on each unit to the same voltage.
(3) Connect each unit and load as shown below, referring the terminal symbols. Use a
phase tester to check the sequence of the phases.
Generator 1 Generator 2 Generator 3
U V W
U V W
U V W
Circuit breaker
No.1 No.2 No.3
Load
[Note]
Connect the cables in the correct sequence of the 3-phases, check the terminal symbols.
(4) Turn the single-parallel change-over switch to "PARALLEL" position on each control
panel.
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