ABB RELION RET670, Commissioning Manual, Page: 147 / 328

1. Subject the IED to healthy normal load conditions for at least two seconds.
2. Apply the fault condition and slowly decrease the measured impedance to find the
operating value of the phase-to-phase fault for zone 1 according to test point 1 in
figure
35 and table 30 . Compare the result of the measurement with the set value.
3. Repeat steps 1 to 2 to find the operating value for test points 2, 3 in table 30 .
Observe that the zones that are not tested have to be blocked and the zone that is
tested has to be released.
4. Repeat steps 1 to 3 to find the operating value for the phase-to-ground fault C-G
according to figure 36 and table 31 .
Test points 8, 9, 10 and 11 are intended to test the directional lines of
impedance protection. Since directionality is a common function for
all six measuring zones, it is only necessary to test points 8, 9, 10 and
11 once, in the forward direction in order to test the accuracy of
directionality (directional angles). Directional functionality testing
(trip inside, no-trip outside) should always be made for all
impedance zones set with directionality (forward or reverse).
11.4.8.2 Measuring the operating time of distance protection zones
Procedure:
1. Subject the IED to healthy normal load conditions for at least two seconds.
2. Apply the fault condition to find the operating time for the phase-to-phase fault
according to test point 10 in figure
35 and table 30 for zone 1. Compare the result of
the measurement with the setting t1PP .
3. Repeat steps 1 to 2 to find the operating time for the phase-to-ground fault according
to test point 10 in figure 36 and table 31 . Compare the result of the measurement with
the setting t1PG .
4. Repeat steps 1 to 2 to find the operating time for all other used measuring zones.
Observe that the zones that are not tested have to be blocked and the zone that is
tested has to be released.
11.4.8.3 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled . Restore connections and settings to their original values, if they were changed
for testing purposes.
1MRK 504 165-UUS -
Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 141
Commissioning manual