Application Notes; Busbar Blocking Scheme; Figure 60: Blocked Earth Fault Logic; Figure 61: Simple Busbar Blocking Scheme - GE MiCOM P40 Agile Technical Manual

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CB Fail Alarm

Remove IN> Start

ISEF>1 Start

ISEF>2 Start

ISEF>3 Start

ISEF>4 Start

The IN/SEF>Blk Start signal is derived from the logical OR of the phase overcurrent start outputs. This output is

then gated with the CB Fail Alarm DDB signal and the Remove IN> Start setting.

APPLICATION NOTES

P14D-TM-EN-8

Chapter 6 - Current Protection Functions

Block highset element

CB fail backtrip

IN/SEF>Blk Start