IEC10000326-3.vsd
R
f
Trip
Alarm
OR
TripDelay
Adaptive
IEC10000326 V2 EN-US
Figure 219: ROTIPHIZ (64R) 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
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.
1MRK 502 066-UUS B
Section 7
Impedance protection
407
Technical manual
Содержание Relion 670 series
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