Testing The Influence Of The Residual Overcurrent Protection - ABB RET670 Commissioning Manual

Section 10
Testing functionality by secondary injection
•
4. Simulate the receiving of the carrier signal so that the functional input signal CR becomes a
logical one.
5. Configure the PUPSD input to connect to the output PICKUP of the carrier accelerating zone
(Power-swing overreaching zone).
6. Initiate any kind of fault within the carrier accelerating zone and check that the TRIP signal
appears after the time, which is equal to the time delay set on the trip timer
Also consider the (average) trip time of the carrier acceleration zone (approximately 30ms).
10.4.10.2

Testing the influence of the residual overcurrent protection

Additionally connect the IED according to the test instructions for the four step residual
overcurrent protection function EF4PTOC (51N/67N), if the Power swing logic (PSLPSCH) is
configured in a way that is controlled by this protection.
Procedure
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
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
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
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.
10.4.10.3 Checking the underreaching zone
Procedure
1. Set the operation of all normal distance protection zones to
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
5. Observe the trip time, which must be equal to the trip time of zone 1, after the measured
impedance enters its operate area.
112
carrier send security timer
(approximately 30ms).
The TRIP signal appears after the time delay, which is equal to the sum of set time
delays for the underreaching zone
for the trip security timer
zone (approximately 30ms).
tDZ timer and faster than the time set on timer tZL .
tCS . Also add the usual trip time for the underreaching zone
tnPP or tnPG (dependent on the type of fault) and
tTrip . Also add the usual operate time for the underreaching
tBlkTr timer.
1MRK 504 154-UUS B
tTrip .
tCS and tTrip .
tCS .
Enabled .
Commissioning manual
M14946-28 v5
M14946-49 v3