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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 curr

ents 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

V01201

& 1

Pole Dead A

Pole Dead B

Pole Dead C

Any Pole Dead

All Poles Dead

VTS Slow Block

CB Open 3 ph

Hardcoded threshold

Figure 167: Pole Dead logic

If both the line current and v

oltage fall below certain thresholds, the device will initiate a Pole Dead condition. The

undervoltage (V<) and undercurrent (I<) thresholds are hardcoded internally.

If one or more poles are dead, the device will indicate which phase is dead and will also assert the Any Pole Dead

DDB signal. If all phases are dead the Any Pole Dead signal would be accompanied by the All Poles Dead signal.

If a VT fails, a VTS Slow Block signal is generated to block the Pole Dead indications that would be generated by

the undervoltage and undercurrent thresholds. However, the VTS logic will not block the Pole Dead indications if

they are initiated by a CB Open 3 ph signal. A CB Open 3 ph signal automatically initiates a Pole Dead condition

regardless of the current and voltage measurement.

P14x Chapter 14 - Monitoring and Control

P14xEd1-TM-EN-1 329

GE MiCOM P145 Agile User Manual

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