Answer / tarun

The protective devices in switch yard are in interlock system if any circuit breaker does not trip under fault condition the next sequence breaker will trip for example bank locker key coustomer having one key and for same lock.bank employ have another key for opening locker

Answer / pvl

Interlock relay is a type of protection system which senses some event and triggers corresponding action.
For example, NC relay for power supply will keep the supply up normally, but as soon as some fault occurs, it will change to OPEN contact and cut the power supply to the system. This action is called interlock and therefore the relay is named interlock relay

Answer / k.prakashchandra

It is a multi-armature relay with positions of armatures dependent on positions of other armatures i.e positions are interconnected

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operation

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Difference between directional earth fault and non-directional earth fault

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