ABB RELION RET670, Commissioning Manual, Page: 153 / 328

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