GE MiCOM P40 Agile Technical Manual page 299

Single breaker current differential (with distance)

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Chapter 9 - Non-Aided Schemes

Partial cross polarisation is therefore substituted for the normal memory polarising, for the duration of the TOC

Delay. If insufficient polarising voltage is available, a slight reverse offset (approximately 10% of the forward reach)

is included in the Zone 1 characteristic to enable fast clearance of close up three-phase faults.

P54x1i-TM-EN-1

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