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V01229

& 1 Pole Dead A

Pole Dead B

Pole Dead C

Any Pole Dead

All Poles Dead

VTS Slow Block

Hardcoded threshold

CB1 Closed

CB2 Closed

CB3 Closed

CB2 Closed

&CB5 Closed

CB5 C losed

CB4 C losed

CB2 Closed

CB3 Closed

CB2 Closed

&CB3 Closed

CB4 Closed

CB3 Closed

P643: 001

P645: 00001

Terminal

Selection

P643: 011

P645: 00011

3Ph CB_Open

3Ph_CB_Open

3Ph CB Open

Terminal

Selection

P643: 100

P643: 110

P645: 10000

P645: 11000

Terminal

Selection

P643: 010

P645: 00110

P645: 00100

P645: 01100

Figure 129: Pole Dead logic - P643 and P645

If both the line curr

ent and voltage fall below a certain threshold 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 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. However, the VTS logic will not block the Pole Dead

indications if they are initiated by a CBx Closed signal. A CBx closed signal is inverted and automatically initiates a

Pole Dead condition regardless of the current and voltage measurement.

6.3 CB STATUS INDICATION

The Pole Dead logic needs a way of initiating the Pole Dead indications for a 3-phase CB Open condition, which

bypasses the V

TS blocking. This is normally achieved with a CB State Monitoring function. However, the P64x does

not contain a dedicated CB state monitoring function, so it needs a mechanism by which to achieve this. To do

this, we produce an internal DDB signal (3 ph CB Open), by looking at the status of the CB auxiliary contacts of the

windings to which the voltage transformers are connected. Each terminal (T1 to T5) has an external CBx Closed

DDB signal associated with it, which are connected to the CB auxiliary contacts if available. The internal 3ph CB

Chapter 13 - Monitoring and Control P64x

280 P64x-TM-EN-1.3

Brand	GE
Model	P642
Category	Relays
Language	English

GE P642 User Manual

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GE P642 Specifications

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