Discussion
In power system protection, the term "relay co-ordination" refers to :
Answer: A
Relay co-ordination refers to the timing of protection relays.
In a network, several relays see the same fault current. Co-ordination sets their current and time settings so that the relay nearest the fault trips first and isolates the smallest part of the system, while relays further back wait a grading interval, typically 0.3 to 0.5 s, and act only as back-up if it fails.
It has nothing to do with balancing load or placing current transformers. Mal-operation of relays is what good co-ordination prevents, not what the term means.
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