Manual 26086 EGCP-2 Engine Generator Control Package
Woodward 77
Synchronizer Description
Synchronization, as normally applied to the generation of electricity, is the
matching of the output voltage wave form of one synchronous alternating current
electrical generator with the voltage wave form of another alternating current
electrical system. For the two systems to be synchronized and connected in
parallel, five conditions must be considered:
• the number of phases in each system;
• the direction of rotation of the phases;
• the voltage amplitudes of the two systems;
• the frequencies of the two systems ;
• the phase angle of the voltage of the two systems.
The first two conditions are determined when the equipment is specified,
installed, and wired. The synchronizer matches the remaining conditions
(voltage, frequency, and phase) before the paralleling breakers are closed.
Functional Description
This section describes how generator and bus matching occurs and how all
conditions are verified by the synchronizer functions.
Operating Modes
The EGCP-2 control is capable of synchronizing across both the generator and
mains breakers, depending on the application of the generator set, and the
configuration of the EGCP-2. An EGCP-2 configured for No Parallel operation
will never allow the generator and mains breakers to be closed at the same time,
and therefore does not synchronize across the mains breaker. Units configured
for Mains Parallel operation will actively synchronize the generator, or in the case
of a multiple unit system, generators, to the utility before closing the utility tie
breaker.
The EGCP-2 monitors the A phase of the generator and compares this with
either the A phase of the Bus PT input, or the A phase of the Mains PT input. The
Bus PT input is switched through DO7 (local bus connect). The Bus PT is always
monitored whenever the EGCP-2 is synchronizing, or dead bus closing across
the generator breaker. Bus PT sensing is a momentary condition as the EGCP-2
will always return to sense the Mains PT input by switching to DO8 (Mains
Disconnect) whenever generator synchronization is complete. Switching to the
Mains Pt allows the EGCP-2 to monitor for a loss of mains condition when
operating on a generator that is not synchronizing across its generator breaker.
NOTE
In systems which operate in parallel with the mains, or with loss of mains
detection modes, it is recommended that each EGCP-2 unit in that system
receive the Mains and Bus PT inputs for proper operation.
The synchroscope tuning menu is used to configure the synchronizing action of
the EGCP-2. The software tuning items in the synchroscope menu apply to both
the generator breaker/contactor and mains breaker/contactor synchronizing
functions.
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