what is the difference between the 94 lockout relay and 86
lock out relay. I have noticed that the 94 lockout relay is
activated when the distance realy is activated and 86 is
activated when the 87T differential is activated. but why
can't the same lockouts be used for both the protection
schemes
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Answer Posted / sachidananda pal
86 is actually an Electrically/Hand reset Master trip relay
that trips both the primary & Secondary of a Transformer
whereas 94 is a lockout relay that is used in transmission
line protection eg. in an Auto recloser.In case of a fault
the Autorecloser shall start it's O-t-CO-T-CO-T-CO-T-CO
operation. After un successfuly trying to reclose the line,
the 94 Lockout relay shall act afetr the time duration set
& will put the Autorecloser in an Lockout condition so that
there are no further reclosing attempts.
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