Manual 37353A
MFR 13 Packages - Protection Relay
Page 48/91
© Woodward
Overcurrent 2
I> 100%
Threshold independent time-overcurrent, level 2
0 to 300 %
Overcurrent (level 2) is defined by this parameter. The percentage configured in
this parameter refers to the configured rated system current (refer to page 36). If
this limit is reached or exceeded, the unit outputs the message "
overcur-
rent 2
". If a relay was assigned to this function in the relay manager, that relay
will be energized.
Overcurrent 2
Delay 00.00s
Pickup delay, level 2
0.02 to 99.98 s
In order to initiate an overcurrent (level 2) alarm, the measured current must exceed
and remain above the configured level 2 threshold without interruption for at least
the period of time specified in this screen.
Overcurrent 3
I> 100%
Threshold independent time-overcurrent, level 3
0 to 300 %
Overcurrent (level 3) is defined by this parameter. The percentage configured in
this parameter refers to the configured rated system current (refer to page 36). If
this limit is reached or exceeded, the unit outputs the message "
overcur-
rent 3
". If a relay was assigned to this function in the relay manager, that relay
will be energized.
Overcurrent 3
Delay 00.00s
Pickup delay, level 3
0.02 to 99.98 s
In order to initiate an overcurrent (level 3) alarm, the measured current must exceed
and remain above the configured level 3 threshold without interruption for at least
the period of time specified in this screen.
Overcurrent
Hysteresis 000%
Hysteresis for the independent time-overcurrent monitoring, levels 1, 2 + 3 1 to 300 %
In order to prevent system fluctuations from continually initiating overcurrent
alarms (levels 1, 2 + 3), a lower release point is defined here. If the control moni-
tors the current above the permissible limit, the current must drop below that
threshold and the current level defined here for the fault condition to be recognized
as no longer existing.
Example: If a 1000A system has an overcurrent limit 1 of 110% (1100A) and a
hysteresis of 105% (1050A), the monitored current for an overcurrent alarm must
drop below 1050A to reset the alarm.