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 / venkatesan
86 lockout relay is a high speed tripping relay which is used to block close and trip the circuit breaker in the event of fault signal received from protective relays.
94 is an interposing relay which is used for high current drive application. Example: A Open or close signal from plc. The PLC output contact is designed for low current drive. To prevent PLC damage we normally use interposing relay.
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