Technical Guide P92x/EN CM/E11
Commissioning Guide
MiCOM P921-P922-P923 Page 19/28
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Time delay (tV>) check:
1. Preset the injection voltage to a value equal to 2x(V>).
2. Inject the voltage into the 3 phases simultaneously.
3. Measure the time delay (tV>): it must be equal to the parametered value ±2%
(or a minimum of ±20ms).
Time delay (tV<) check:
1. Disconnect the previously injected voltage.
2. Measure the time delay (tV<): it must be equal to the parametered value ±2%
(or a minimum of ±20ms).
5.3.3.2 Stages (V>) or (V<) with inverse time delay
Values to be measured: time delays (tV>) and (tV<)
Action check: see above.
Time delays (tV>) and (tV<) check:
The time delay is measured for two injected voltages, for example at 1.1x(V>) and
1.4x(V>).
Injected voltage Rated trip time for TMS=1
(in seconds)
1.2x(U>) 5
1.4x(U>) 2.5
The time delay measured must be equal to the parametered value ±5% (or a
minimum of ±40ms).
The time delay is measured for two injected voltages, for example at 0.9x(V<) and
0.6x(V<).
Injected voltage Rated trip time for TMS=1
(in seconds)
0.9x(V<) 10
0.6x(U<) 2.5
The time delay measured must be equal to the parametered value ±5% (or a
minimum of ±40ms).
5.3.4 Configuration with 3 single voltages (“3Vpn”) and “OR” detection logic
Repeat the tests described in paragraph 5.3.3, injecting the voltage into one phase
only. In view of the detection logic (“OR”), tripping should occur in these conditions.
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