Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
© Woodward Page 119/190
Mains Voltage Monitoring
Monitoring the mains voltage is absolutely vital if a generator is operated in conjunction 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 both power
circuit breakers (MCB and GCB) are closed.
The phase-phase (wye) voltage is monitored for units with software below V1.0700.
Parameter 178
Mains volt.monit
phase-phase
V1.0700 and above only
Mains voltage monitoring phase-phase / phase-neutral
This parameter determines how the voltage is to be measured.
This screen only affects the display. The screens of the protective functions are de-
fined below.
The limit values configured below are utilized for the assessment emergency power operations if the following
parameters are enabled. 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 range" - If one or more phases of the generator voltage ex-
ceeds the limit values set for overvoltage or undervoltage, the power circuit breaker that disconnects from the
mains is immediately opened. The prerequisite of mains voltage monitoring is that the generator is operating in
mains parallel (the MCB and GCB are both closed).
Parameter 179
Mains voltage
monitoring ON
Mains voltage monitoring ON/OFF
ON................ Monitoring of the mains voltage will be performed. The subsequent
parameters of this function are displayed.
OFF.............. Monitoring is disabled, and the subsequent screens of this function
are not displayed.
Parameter 180
Mains overvolt.
U Ph.-Ph. > 000V
V1.0700 and above only:
Mains overvolt.
U Ph.-N. > 000V
Mains overvoltage threshold value (Ph.-Ph.) [1] 20 to 130 V; [4] 20 to 520 V
(Ph.-N.) [1] 20 to 75 V; [4] 20 to 300 V
If this threshold value has been exceeded for at least the delay time (Para-
meter 181), the following alarm class is issued. Depending on the configured mains
decoupling procedure, the GCB, MCB, or an external CB will be opened.
Issuing of class F0 alarm
Parameter 181
Mains overvolt.
Delay time 0.00s
Mains overvoltage delay 0.02 to 9.98 s
For the control unit to recognize a mains overvoltage fault condition, the threshold
value configured in
Parameter 180 must be exceeded without interruption for this
period of time.
Parameter 182
Mains undervolt.
U Ph.-Ph. < 000V
V1.0700 and above only:
Mains undervolt.
U Ph.-N. < 000V
Mains undervoltage threshold value (Ph.-Ph.) [1] 20 to 130 V; [4] 20 to 520 V
(Ph.-N.) [1] 20 to 75 V; [4] 20 to 300 V
If this threshold value has fallen below for at least the delay time (Parameter 183),
the following alarm class is issued. Depending on the configured mains decoupling
procedure, the GCB, MCB, or an external CB will be opened.
Issuing of class F0 alarm
Parameter 183
Mains undervolt.
Delay time 0.00s
Mains undervoltage delay 0.02 to 9.98 s
For the control unit to recognize a mains undervoltage fault condition, the threshold
value configured in
Parameter 182 must be exceeded without interruption for this
period of time.

Woodward GCP-20 Series Specifications

General

Brand	Woodward
Model	GCP-20 Series
Category	Control Unit
Language	English