What are the main functions of Differential Relays?
Answer: Differential Relays must have the following features:
- High speed operation
- High sensitivity
- Adequate short circuit thermal rating
- Ability to operate operate with low values of voltage
- Burden must not be excessive
- There should be no voltage and current creep
What is meant by "Relay Settings"?
Answer: Relay settings means actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions
Define Plug Setting Multiplier?
Answer: Plug Setting Multiplier and is defined as the ratio of fault current in the relay coil to the pick up value
Where is directional relay used?
Answer: Directional relay are used when graded time overload protection is applied to ring mains and interconnected networks
For what type of fault does Buchholz relay is employed?
Answer: Buchholz relay provides protection only against transformer internal fault
How definite time lag is achieved in attraction armature relays?
Answer: The instantaneous type attraction armature can be made a definite time lag or inverse time lag by using a oil dash pot, an air escapement chamber a clock work mechanism or by placing a fuse in parallel wit it.
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