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8 POLE DEAD FUNCTION

The Pole Dead Logic is used to determine and indicate that one or more phases of the line are not energised. A

Pole Dead condition is determined either by measuring:

● the line currents and/or voltages, or

● by monitoring the status of the circuit breaker auxiliary contacts, as shown by dedicated DDB signals.

It can also be used to block operation of underfrequency and undervoltage elements where applicable.

8.1

POLE DEAD LOGIC

V01247

1 Pole Dead A

Pole Dead B

Pole Dead C

Any Pole Dead

All Poles Dead

VTS Slow Block

CB Open 3 ph

20 ms

CB Open A ph

CB Open B ph

CB Open C ph

20 ms

I< Current Set

V <

I< Current Set

V <

I< Current Set

Figure 253: Pole Dead logic

If both the line current and voltage values fall below a certain threshold, or a CB Open condition is asserted from

the state control logic, the device initiates a Pole Dead condition. The current and voltage thresholds can be set

with the I< Current Set and the V< settings respectively, in the CBFAIL&P.DEAD column.

If one or more poles are dead, the device indicates which phase is dead and asserts the Any Pole Dead DDB

signal. If all phases are dead the Any Pole Dead signal is accompanied by the All Poles Dead signal.

If the VT fails, a VTS Slow Block signal is taken from the VTS logic to block the Pole Dead indications that would be

generated by the undervoltage and undercurrent thresholds.

Chapter 17 - Monitoring and Control P543i/P545i

450 P54x1i-TM-EN-1

GE MiCOM P40 Agile User Manual

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