Sotf-Tor Activation Logic - GE MiCOM P40 Agile Technical Manual

P44x/EN AP/Hb6
(AP) 5-62
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.
Application Notes
MiCOM P40 Agile P442, P444