Mostly auto re closer will come at substations.In order to rectify power outrage for transient faults.
generally the trip circuit of breaker is going to activate for what ever the fault (temporary or permanent).Once the trip circuit was activated then the respective breaker is going to trip in order to isolate fault from healthy part, Once the breaker undergone to trip then person should give command to close circuit of breaker after the respective fault was cleared, i mean this closing process is not automatic process.
If the fault is temporary then breaker is undergone to tripping mode,after clearing fault it may not close automatically,then we got power interruption.
Auto re closer is an electrical device which monitor the fault condition for every time period (may be like 1 or 2 sec).generally we hear the word SHOT in case of auto re closer,once the fault occurred then breaker is going to trip without involving the master trip relay (86 lockout),then auto re closer closes the breaker after its time period,if again the fault is there in line then again breaker will goes to trip,again the auto re closer closes the breaker, and if fault is there yet then auto re closer trip the breaker permanently (considering fault was permanent) using lockout relay.the number of times auto re closer acts ac considered as shots.
Auto re closer are generally two types, single phase and three phase auto re closer.single phase auto re closer will operate for only single phase faults. It will not operate for three phase faults. generally temporary faults are single phase faults. three phase auto re closer will operate operate for three phase faults.
Q. What is lockout relay?
A. When any fault occurs on system,relay senses and will not give trip command directly to breaker,relay will pickup the lockout relay.Then lockout will sends trip command to breaker trip coil,then breaker under goes to trip.once the lockout has pickuped the it has to be resettled by manually only,it will not resettled automatically.
Q. What is lockout relay?
A. When any fault occurs on system,relay senses and will not give trip command directly to breaker,relay will pickup the lockout relay.Then lockout will sends trip command to breaker trip coil,then breaker under goes to trip.once the lockout has pickuped the it has to be resettled by manually only,it will not resettled automatically.
No comments:
Post a Comment