Woodward GCP-30 Series User Manual

Manual 37365A GCP-30 Series Packages - Genset Control
© Woodward Page 105/179
Mains Frequency Monitoring
Monitoring the mains frequency is absolutely vital if a generator is operated in parallel with the infinite grid. In
the event of a 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.
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 frequency not within the permissible limits" - If the mains frequency exceeds the limit values
configured for overfrequency or underfrequency a mains failure is recognized. The circuit breaker configured to
disconnect from the mains is immediately opened. The prerequisite of mains frequency monitoring is that the ge-
nerator is operating in parallel with the mains (the MCB and GCB are both closed).
Parameter 179
Mains frequency
monitoring ON
Mains frequency monitoring ON/OFF
ON ................ Monitoring of the mains frequency is enabled. The subsequent
screens of this function are displayed.
OFF .............. Monitoring of the mains frequency is disabled. The subsequent
screens of this function are not displayed.
Parameter 180
Mains overfreq.
f > 000.0%
Mains overfrequency threshold value 80.0 to 140.0 %
L This value refers to the parameter "Rated freq. in system" ((Parameter 9).
If the monitored mains frequency exceeds the configured percentage of the rated
system frequency for at least the delay time configured in Parameter 181, 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
Parameter 181
Mains overfreq.
delay 0.00s
Mains overfrequency delay 0.02 to 9.98 s
For the control unit to recognize that a mains overfrequency fault has occurred, the
threshold value configured in Parameter 180 must be exceeded without interruption
for t
his period of time.
Parameter 182
Mains underfreq.
f < 000.0%
Mains underfrequency threshold value 80.0 to 140.0 %
L This value refers to the parameter "Rated freq. in system" ((Parameter 9).
If the monitored mains frequency falls below the configured percentage of the rated
system frequency for at least the delay time configured in Parameter 183, 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
Parameter 183
Mains underfreq.
delay 0.00s
Mains underfrequency delay 0.02 to 9.98 s
For the control unit to recognize that a mains underfrequency fault has occurred,
the threshold value configured in Parameter 182 must be exceeded without inter-
rupt
ion for this period of time.

Woodward GCP-30 Series Specifications

General

Brand	Woodward
Model	GCP-30 Series
Category	Controller
Language	English