1. Initiate a single phase-to-ground fault within both power-swing zones.
Make sure that none of CS or TRIP output signals appear after the time delays tCS
and tTrip.
BLKZMUR must appear together with the fault and must remain active until the
fault has been switched off plus the time delay, as set on the tBlkTr timer.
2. Initiate a phase-to-phase fault within the operating area of both power-swing zones.
Make sure that CS and TRIP output signals appear after the time delays tCS.
3. Switch the operation of the zone 1 distance protection function on and fulfill all the
conditions for single-pole autoreclosing.
4. Simulate a single phase-to-ground fault within the reach of zone 1 and both power-
swing zones.
The fault should cause a single-pole tripping with the normal operating time of zone
1.
5. Repeat the fault within the dead time of single-pole autoreclosing.
Make sure, that PSLPSCH generates a BLKZMUR signal and no CS and TRIP.
11.4.10.3 Checking the underreaching zone
Procedure
1. Set the operation of all normal distance protection zones to Enabled.
2. Simulate a fault without fault resistance in the middle of distance protection zone 1.
Make sure that the trip appears within the operate time for the distance protection
zone 1 and no BLKZMOR output signal appears.
3. Switch off the fault and prepare a new fault without fault resistance within the
normal distance protection zone 2 operate area, but outside the zone 1 operate area.
4. Switch on the fault and move it into the zone 1 operate area with a time delay longer
than the time set on the tDZ timer and faster than the time set on timer tZL.
5. Observe the trip time, which must be equal to the trip time of zone 1, after the
measured impedance enters its operate area.
No delayed operation of zone 1 must be observed.
6. Configure the PUPSD functional input to connect to the PICKUP functional output
and repeat the previous fault.
Fast trip, caused by the operation of zone 1 must appear with a time delay, which is
equal to the set time delay on the timer tZL plus zone 1 normal otrip time. Also,
observe the BLKZMOR functional output signal, which must appear for a short
time.
7. Be sure to establish the original configuration of the IED and the original settings of
all setting parameters.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 147
Commissioning manual
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