Woodward GCP-30 Series User Manual

Manual 37365A GCP-30 Series Packages - Genset Control
Page 106/179 © Woodward
Mains Voltage Monitoring
Monitoring the mains voltage is absolutely vital if a generator is operated in parallel with the infinite grid. In the
event of mains failure (e.g. utility power outage) the generator that is operating in parallel with the utility must be
automatically disconnected from the mains. Decoupling from the mains only occurs when the MCB and GCB are
closed.
The phase-to-neutral (wye) voltage is always monitored.
If the following parameters are enabled, the limit values are used to assess if an emergency power operation
should be initiated. The parameters below define if the mains are or aren't present. The breaker opening times do
not affect these parameters.
Function: "Mains voltage not within the permissible limits" - If one or more phases of the generator voltage ex-
ceeds the limit values set for overvoltage or undervoltage, a mains failure is recognized. The circuit breaker con-
figured to disconnect from the mains is immediately opened. The prerequisite of mains voltage monitoring is that
the generator is operating in parallel with the mains (the MCB and GCB are both closed).
Parameter 184
Mains voltage
monitoring ON
Mains voltage monitoring ON/OFF
ON ................ Monitoring of the mains voltage is enabled. The subsequent screens
of this function are displayed.
OFF .............. Monitoring of the mains voltage is disabled. The subsequent screens
of this function are not displayed.
Parameter 185
Mains overvolt.
V > 000.0%
Mains overvoltage threshold value 20.0 to 150.0 %
L This value refers to the parameter "Rated volt. in system" (Parameter 17).
If the monitored mains voltage exceeds the configured percentage of the rated sys-
tem frequency for at least the delay time configured in Parameter 186, an F0 class
al
arm is issued. The MCB, GCB, or an external CB is opened depending on how
the GCP is configured to decouple from the mains.
Issuing of F0 class alarm
Parameter 186
Mains overvolt.
delay 0.00s
Mains overvoltage delay 0.02 to 9.98 s
For the control unit to recognize that a mains overvoltage fault has occurred, the
threshold value configured in Parameter 185 must be exceeded without interruption
for t
his period of time.
Parameter 187
Mains undervolt.
V < 000.0%
Mains undervoltage threshold value 20.0 to 150.0 %
L This value refers to the parameter "Rated volt. in system" (Parameter 17).
If the monitored mains voltage falls below the configured percentage of the rated
system frequency for at least the delay time configured in Parameter 189, an
F0 cl
ass alarm is issued. The MCB, GCB, or an external CB is opened depending
on how the GCP is configured to decouple from the mains.
Issuing of F0 class alarm

Woodward GCP-30 Series Specifications

General

Brand	Woodward
Model	GCP-30 Series
Category	Controller
Language	English