Alstom MiCOM P545 - 8.4.3 Distance protection operation and contact assignment; 8.4.3.1 Phase A; 8.4.3.2 Phase B; 8.4.3.3 Phase C

P54x/EN CM/La4 Commissioning
(CM) 10-44 MiCOM P543, P544, P545 & P546
CM
8.4.3 Distance protection operation and contact assignment
8.4.3.1 Phase A
Prepa
re a dynamic A phase to neutral fault, at half the Zone 1 reach. Connect a timer to
start when the fault injection is applied, and to stop when the trip occurs. To verify correct
output contact mapping use the trip contacts that would be expected to trip the circuit
breaker(s), as shown in the table. For two breaker applications, stop the timer once CB1
and CB2 trip contacts have both
closed, monitored by connecting the contacts in series to
stop the timer if necessary.
Single breaker Two circuit breakers
Three Pole Tripping Any Trip Any Trip (CB1) and Any Trip (CB2)
Single Pole Tripping Trip A Trip A (CB1) and Trip A (CB2)
Apply the fault and record the phase A trip time. Switch OFF the ac supply and reset the
alarms.
8.4.3.2 Phase B
Re
configure to test a B phase fault. Repeat the test in 8.4.3.1, this time ensuring that the
brea
ker trip contacts relative to B phase operation close correctly. Record the phase B trip
time. Switch OFF the ac supply and reset the alarms.
8.4.3.3 Phase C
Rep
eat 8.4.3.2 for the C phase.
The average
of the recorded operating times for the three phases should typically be less
than 20 ms for 50 Hz, and less than 16.7 ms for 60 Hz when set for instantaneous operation.
Switch OFF the ac supply and reset the alarms.
 Where a non-zero tZ1 Gnd time delay is set in the DISTANCE menu column, the
expected operating time is typically within +/- 5% of the tZ1 setting plus the
“instantaneous” delay quoted above.
8.4.3.4 Time delay settings tZ1 Ph, and tZ2 - tZ4
Only a visual
check that the correct time delay settings have been applied is needed. The
relevant settings in the SCHEME LOGIC column are:
[3409: tZ1 Ph Time Delay]
[3411: tZ2 Ph Time Delay] and [3412: tZ2 Gnd Time Delay]
[3419: tZ3 Ph Time Delay] and [341A: tZ3 Gnd Time Delay]
[3421: tZP Ph Time Delay] and [3422: tZP Gnd Time Delay]
[3429: tZ4 Ph Time Delay] and [342A: tZ4 Gnd Time Delay]
Note: The P54x allows separate time delay settings for phase (“Ph”) and
ground (“Gnd”) fault elements. BOTH
must be checked to ensure that
they have been set correctly.