GE MiCOM P40 Agile Technical Manual page 215

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Application Notes

MiCOM P40 Agile P442, P444

Any Pole Dead

• The SOTF protection is enabled when the circuit breaker has been open 3 pole for

longer than 110 s. This time-delay is settable. It allows a variation of the time between

the detection of a dead pole condition and when the internal logic detects a "dead line"

and activates the SOTF logic if no autoreclose cycle is in progress. Therefore, the

SOTF function is enabled for manual reclosures, not for autoreclosure.

The SOTF Enable logic is activated in 2 cases:

3. If no external close command (manual or by remote communications via a control

system) is issued:

When the internal leels detectors have detected a three pole open condition for longer

than SOTF Delay (default value is 110 s); when all the poles are closed, SOTF is enabled

for a duration of 500 ms and then resets,

4. When an external close command (manual or by remote communications via a control

system) is issued:

The SOTF logic is activated immediately. When all the poles are closed (after the external

close command if a check synchronism condition is used in the PSL); SOTF is enabled for

500 ms and then resets.

Figure 40: SOTF-TOR logic - start

P44x/EN AP/Hb6

Troubleshooting