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 / syed furqan akhter
94 relay shall not be called out the lockout relay.It is
basically a self reset relay.Its contacts operate till the
fault persist or its coil energizes and when its de-
energizeits contact reach its normal position. Its usage is
where Autoreclosing is required to close the Circuit
breaker whenever temporary fault occurs.Therefore in
overhead lines this relay (94)is used.
While 86 relay is a lockout relay means once its coil
enrgizes its contact will be operated and will never come
its normal position until it is reset by hand or
electrically. Therefore it is used where permenant faults
occurs and no autoreclosing scheme is posible.
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