Discrimination What is the current overload protection system?
A. It is set to allow relays in many systems. Work group by allowing the same type of relay to work simultaneously
B. It is a sequence of protection. By allowing relays that are near the source to work first and a remote relay to act as a backup
C. It is set to allow relays in many systems. Coordinate By allowing relays that are far from the most paid source to work first and relays that are in the position near the source. The work is the next order without the need for grading margins.
D. It is a sequence of protection. By allowing the main relay (Primary Relay) near the point of short circuit to work first and the backup relay that is far away has a is long enough Grading margin value to ensure that the backup relay will operate only if primary protection fail to operate.
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Answer: D
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