Manual 26174
EGCP-2 Engine Generator Control Package
Woodward
167
AVR
Automatic Voltage Regulator. A device that controls the
field excitation of an AC generator in such a way as to
maintain a specific voltage level over the operating load
range of the generator. The EGCP-2 control biases the
voltage setting of the AVR to voltage match during
synchronization and to control reactive load during load
share and mains parallel operation.
Base Load
A term used to describe a generator loading condition in
which the generator is paralleled to another source of
power, typically the mains, and loaded to a fixed kW
level. The generator maintains this kW level regardless
of load on the Mains.
Breaker
A device used to connect one power source to a load, or
to another power source. Breakers can be either
manually or automatically operated, and will usually
contain overcurrent protection. The EGCP-2 controls
motorized breakers by issuing a momentary breaker
close output to energize the breaker coil, and a separate
breaker open output to shunt trip the breaker to open it.
Contactor
A device used to connect one power source to a load, or
to another power source. Contactors are typically
automatic in operation, and are energized for closure
from an external source. The EGCP-2 controls
contactors by issuing a contactor close output to close
the contactor, and removing this output to open the
contactor.
CT
Current Transformer. A device used to sense current
levels on a high current source, such as a generator.
The secondary side of the current transformer supplies a
lower current signal that is safe to feed into metering and
control devices. The EGCP-2 uses 5A secondary current
CTs for its current sensing inputs from the three phases
of the generator.
Dead Bus Closing
The ability of a generator breaker control device to
sense, and safely close on to a load which has no other
generators or sources of power tied to it. Dead Bus
Closing must not allow two generators to attempt closure
to the dead bus at the same time, since an out of phase
paralleling situation would likely occur. The EGCP-2
uses its Local Operating Network to insure safe dead
bus closing among all units tied to this network. The
units have a single dead bus token, which allows the unit
possessing it to close to the dead bus. Only one token
exists on the network, so there is no possibility of
multiple units closing to the dead bus simultaneously.
Dead Bus Closing is always active in single unit
configurations.