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44x/EN AP/Hb6

Application Notes

(AP) 5

-62 MiCOM P40 Agile

P442, P444

Figure 39: SOTF-TOR activation logic

TOR Enable logic is activated in 2 cases:

1. When the internal autorecloser is enabled or when the reclaim signal from an external

autorecloser is connected to a logic input (opto input):

As soon as the reclaim time starts, the “TOR Enable” is activated. It will be reset at the end

of the internal or external reclaim time.

2. Without any reclaim time (internal AR disabled or external opto input Reclaim Time not

assigned in the PSL):

TOR Enable will be activated during a 200 ms time window, following the pole dead

detection. The TOR logic will reset (TOR Enable) ONLY 500 ms after the drop off of the “any

pole dead” detection.

This behaviour has been designed to avoid any maloperation on a parallel line, in case of an

incorrect Any Pole Dead detection performed by the internal level detectors (e.g. fault in front

of a busbar on a parallel line and weak infeed at the other end of the line)

A 200 ms delay will permit tripping of the adjacent line. The level detectors will then reset the

timer:

• The TOR protection logic is enabled when any circuit breaker pole has been open

for longer than 200 ms but not longer than the 110 s default value (ie. autoreclose first

shot in progress) - the timer is settable. It allows a variation of time between the

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

and activates the SOTF logic or when the relay’s logic detects that further time-

delayed autoreclose shots are in progress.

GE P444 User Manual

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