Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-55
CM
If cell [3503: GROUP 1 OVERCURRENT, >1 Directional] has been set to ‘Directional Fwd’
or ‘Directional Rev’ then rated voltage should be applied to terminals C20 and C21.
Ensure that the timer will start when the current is applied to the relay.
Note: If the timer does not stop when the current is applied and stage 1 has
been set for directional operation, the connections may be incorrect
for the direction of operation set. Try again with the current
connections reversed.
8.4.12.2 Perform the test
Ens
ure that the timer is reset.
Apply a current of twice the setting in cell [3504: GROUP 1 OVERCURRENT, >1 Current
Set] to the relay and note the time displayed when the timer stops.
Check that the red trip LED has illuminated.
8.4.12.3 Check the operating time
Che
ck that the operating time recorded by the timer is within the range shown in Table 13.
Note: Except for the definite time characteristic, the operating times given in
Table 14 are for a time multiplier or time dial setting of 1. Therefore,
to obtain the operating time at other time multiplier or time dial
settings, the time given in Table 14 must be multiplied by the setting of
cell [3506: GROUP 1 OVERCURRENT, >1 TMS] for IEC and UK
characteristics or cell [3507: GROUP 1 OVERCURRENT, Time Dial]
for IEEE and US characteristics.
In addition, for definite time and inverse characteristics there is an additional delay of up to
0.02 second and 0.08 second respectively that may need to be added to the relay’s
acceptable range of operating times.
For all characteristics, allowance must be made for the accuracy of the test equipment being
used.
Operating time at twice current setting and time multiplier/
time dial setting of 1.0
Characteristic
Nominal (seconds) Range (seconds)
DT
[3505: >1 Time Delay] setting
Setting ±2%
IEC S Inverse 10.03 9.53 - 10.53
IEC V Inverse 13.50 12.83 - 14.18
IEC E Inverse 26.67 24.67 - 28.67
UK LT Inverse 120.00 114.00 - 126.00
IEEE M Inverse 3.8 3.61 - 4.0
IEEE V Inverse 7.03 6.68 - 7.38
IEEE E Inverse 9.50 9.02 - 9.97
US Inverse 2.16 2.05 - 2.27
US ST Inverse 12.12 11.51 - 12.73
Table 13: Characteristic operating times for >1
On completion of the tests any current differential, distance, overcurrent, earth fault,
breaker fail or supervision elements which were disabled for testing purposes must
have their original settings restored in the CONFIGURATION column.
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