Testing Permissive Overreaching; Testing Blocking Scheme; Completing The Test - ABB RET670 Commissioning Manual

1MRK 504 165-UEN A
11.11.2.2
11.11.2.3
11.11.2.4
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection

Testing permissive overreaching

1. Activate the receive (CRLx) signal in the IED.
2. Apply healthy normal load conditions to the IED for at least two seconds.
3. Apply a fault condition within the permissive zone.
4. Check that correct trip outputs, external signals, and indication are obtained
for the all actual types of fault generated.
5. Check that the other zones operate according to their zone timer and that the
send (CSLx) signal is obtained only for the zones and phases that are
configured to give the actual signal. Also the zone connected to CSLx
underreach is giving CSLx in this mode.
6. Deactivate the IED receive (CRLx) signal.
7. Apply healthy normal load conditions to the IED for at least two seconds.
8. Apply a fault condition within the permissive zone.
9. Check that trip time complies with the zone timers and that correct trip
outputs, external signals, and indications are obtained for the actual type of
fault generated.

Testing blocking scheme

1. Deactivate the receive (CRLx) signal of the IED.
2. Apply healthy normal load conditions to the IED for at least two seconds.
3. Apply a fault condition within the forward directed zone used for scheme
communication tripping.
4. Check that correct trip outputs and external signals are obtained for the type
of fault generated and that the operate time complies with the tCoord timer
(plus relay measuring time).
5. Check that the other zones operate according to their zone times and that a
send (CSLx) signal is only obtained for the reverse zone.
6. Activate the IED receive (CRLx) signal.
7. Apply a fault condition in the forward directed zone used for scheme
communication tripping.
8. Check that the no trip from scheme communication occurs.
9. Check that the trip time from the forward directed zone used for scheme
communication tripping complies with the zone timer and that correct trip
outputs, external signals, and indications are obtained for the actual type of
fault generated.

Completing the test

Continue to test another function or end the test by changing the TESTMODE
setting to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
Section 11
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