Signal Repercussions; Demonstrate Correct Overcurrent Function Operation; Connect The Test Circuit - GE MiCOM P40 Agile Technical Manual

P44x/EN CM/Hb6
(CM) 9-38

Signal repercussions:

The signal (VT fail alarm) drops off if:
Fuse_Failure = 0
and
INP_FFUS_Line = 0
and
(All Poles Dead Or healthy system)
All Poles Dead:
No current AND no voltage on the line or open circuit-breaker
Healthy system:
Rated voltage on the line AND
• No zero sequence voltage and current AND
• No starting AND
• No power swing.
5.4

Demonstrate Correct Overcurrent Function Operation

This test, performed in stage 1 of the overcurrent protection function in setting group 1,
demonstrates that the relay is operating correctly at the application-specific settings.
It is not considered necessary to check the boundaries of operation where cell [3502:
GROUP 1 OVERCURRENT, I>1 Direction] is set to 'Directional Fwd' or 'Directional Rev' as
the test detailed test already confirms the correct functionality between current and voltage
inputs, processor and outputs and earlier checks confirmed that the measurement accuracy
lies within the stated tolerance.
5.4.1

Connect the test circuit

Determine which output relay has been selected to operate when an I>1 trip occurs by
viewing the relay's programmable scheme logic.
The programmable scheme logic can only be changed using the appropriate software. If this
software has not been available then the default output relay allocations will still be
applicable.
If the trip outputs are phase-segregated (i.e. a different output relay allocated for each
phase), the relay assigned for tripping on 'A' phase faults should be used.
If stage 1 is not mapped directly to an output relay in the programmable scheme logic, output
relay 3 should be used for the test as it operates for any trip condition.
The associated terminal numbers can be found either in the external connection diagram
(P44x/EN IN) or in Table 5.
Connect the output relay so that its operation will trip the test set and stop the timer.
Connect the current output of the test set to the 'A' phase current transformer input of the
relay (terminals C3 and C2 where 1A current transformers are being used and terminals C1
and C2 for 5A current transformers).
If [3502: GROUP 1 OVERCURRENT, I>1 Direction] is set to 'Directional Fwd', the current
should flow out of terminal C2 but into C2 if set to 'Directional Rev'.
MCB/VTS Line
DDB #101
MCB/VTS Bus
DDB #100
Commissioning
MiCOM P40 Agile P442, P444
VTS Fast
DDB #263
VT Fail Alarm
DDB #132
P3022ENa