IEC10000326-3.vsd
R
f
Trip
Alarm
OR
TripDelay
Adaptive
IEC10000326 V2 EN
Figure 130: ROTIPHIZ Alarm and trip logic
If the fault resistance R
f
is smaller than R
Alarm
and longer than alarm delay (using
delay-on), output ALARM is set. If the fault resistance R
f
is smaller than R
Trip
, using
internal trip time characteristic, output signal TRIP is set after the calculated time. For
trip time delay, see fig
131
When 1s filter length is used and the fault resistance is equal to the set value RTrip, the
trip time is about 10 s. If the fault resistance is estimated to be 0 Ω, the trip delay is 2
s. For values in between, the delay follows the linear interpolation describing the fault
resistance time characteristic.
1MRK502052-UEN B Section 7
Impedance protection
291
Technical manual
To Next Page
Loading...
