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
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.
Is This Answer Correct ? | 35 Yes | 1 No |
Post New Answer View All Answers
what is meant by the phrase 'static load' in case of shorting in a generator excitation system?
which book to refer in electrical engineering for iocl exam & which book for general english.
hey guys help me out.....what are the industrial uses/functions of nozzles in industries
How to Decide(calculate) Bush bar size for copper and aluminiam ?
How do we calculate transformer oil in liter from the rating of the transformer.
WHY L-G FAULT IS MORE SEVERE IN TERMS OF RRRV?
What is the important precuations need tocarried out while working with Electrolite in Battery PM?
What is the restart inhabit setting in ABB spam150c relay (Motor protection relay)
2. What are the parameters of EHT sub-station?
how is the connection of a 3 phase ct trivector meter done on a pole mounted transformer
After taking shutdown of 11kv feeder, if you see 5kv by phasing stick in the cable side, is it possible to close earth switch in cable.
what is the prinsiple of dc motor and construction and working ,application of dc motor.
My question is abt backlog.I had dropped one subject in my second year, and completed this subject in the 3rd attempt, so how many backlogs i have got?1 or 3?plz sujjest the answer as soon as possible
how i calculate the syncrones generator NGR resistance .if we have a 6mw generator line voltage of generator 11kv also line current 393.3 ampere.
what is the function of choke in the flourcent tube lights and why the colour is in white mostly in flourcent tube lights