Physics · Power System Protection
In which of the following situations is current graded protection most appropriately used?
- 1When instantaneous tripping is essential to protect delicate components
- 2When overvoltage protection is needed in distribution systems
- 3When protection against earth faults in low-voltage equipment is needed
- 4When selective coordination with definite time delay is acceptable and backup protection is required✓
Correct answer
When selective coordination with definite time delay is acceptable and backup protection is required
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