Woodward GCP-30 Series - Time-Overcurrent Monitoring; Figure 3-8: Characteristic of the Time-Overcurrent Monitoring

Manual 37278B GCP-30 Series - Genset Control
Page 96/174 © Woodward
Time-Overcurrent Monitoring
NOTE
All percentage values refer to a percentage of the generator rated power (Parameter 33; page 26).
Function: The GCP-30 utilizes a two tier time-overcurrent monitoring with separate adjustable time delays. The
threshold values and delays can be selected so that the monitored current level is independent from the tripping
time. The level 2 overcurrent is used as a fast-triggering high-current stage for protection against short circuits.
The level 1 overcurrent reacts overcurrents below level 2 but above permissible limits that are present over a
longer period of time.
I >>
(I )
I >
(I )
t
2
t
1
t [s]
I [%]
1
2
Figure 3-8: Characteristic of the time-overcurrent monitoring
Parameter 189
Gen.overcurrent
monitoring ON
Overcurrent monitoring ON/OFF
ON ................ Monitoring of the generator current will be performed for overcur-
rent. The subsequent parameters of this function are displayed.
OFF .............. Monitoring is disabled, and the subsequent screens of this function
are not displayed.
Parameter 190
Gen.overcurrent
limit 1 000%
Threshold value overcurrent limit 1 0 to 300 %
If the threshold value has been exceeded for at least the delay time (Parameter 191),
the following alarm class is initiated.
Issuing of class F3 alarm
Parameter 191
Gen.overcurrent
delay 1 00.00s
Independent time overcurrent, delay, limit 1 0.02 to 9.98 s
For the control unit to recognize a time-overcurrent fault condition, the threshold
value configured in Parameter 190 must be exceeded without interruption for this
peri
od of time.