P92x/EN CM/E11 Techncal Guide
Commissioning Guide
Page 18/28 MiCOM P921-P922-P923
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5.3.3 Configuration with 3 single voltages (“3Vpn”) and “AND” detection logic
Do not exceed a maximum voltage of 2xVn in the following tests.
In view of the detection logic (“AND”), the voltages must be injected into the 3 phase
inputs to cause tripping to occur.
5.3.3.1 Stages (V>) or (V<) with definite time delay
Values to be measured:
1. stage (V>) or (V<)
2. time delay (tV>) or (tV<)
Stage (V>) check:
1. If time delay (tV>) is short, gradually inject the voltage into the 3 phases up to
the stage value: tripping should occur for a voltage equal to the stage (V>) to
within ±2%
2. If time delay (tV>) is long, inject a voltage equal to 0.98x(V>) into the 3 phases
and check that tripping does not occur. Then inject 1.2x(V>) and check that
tripping occurs.
3. Gradually reduce the voltage on one of the phases and measure the value of
the drop-off stage (V>) : the function must reset for a voltage less than or equal
to the programmed hysteresis.
Stage (V<) check:
1. If time delay (tV<) is short, gradually reduce the voltage on the 3 phases from
the rated voltage to the stage value: tripping should occur for a voltage equal
to the stage (V<) to within ±2%
2. If time delay (tV<) is long, inject a voltage equal to 1.02x(V<) into the 3 phases
and check that tripping does not occur. Then inject 0.8x(V<) and check that
tripping occurs.
3. Gradually increase the voltage on one of the phases and measure the value of
the drop-off stage (V<) : the function must reset for a voltage greater than or
equal to 1.02x(V<).
Action check:
1. appearance of an alarm message on the display
2. flashing of the “Alarm” LED
3. illumination of the “Trip” LED if tripping is programmed
4. illumination of the LEDs associated with instantaneous information (V>) and
(V<) and time-delayed information (tV>) and (tV<) if programmed
5. trip relay operation (RL1) if programmed
6. operation of output relay associated with stages (V>) and (V<) if programmed
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