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Fault Detection and Tripping

What is the primary function of a protective relay in an electrical system?
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Answer & Explanation
Correct AnswerB. To detect faults and initiate the tripping of circuit breakers

Quick Explanation

A protective relay continuously evaluates electrical quantities to recognize abnormal or fault conditions. When its operating criterion is met, it sends a trip command to the appropriate circuit breaker to isolate the faulty section.

Fault Detection and Tripping explanatory diagram

Detailed Explanation

Correct Answer

B — To detect faults and initiate the tripping of circuit breakers

Explanation

A protective relay continuously evaluates electrical quantities to recognize abnormal or fault conditions. When its operating criterion is met, it sends a trip command to the appropriate circuit breaker to isolate the faulty section.

Key Concept

Fault Detection and Tripping

Exam Point

Relay detects/decides; circuit breaker interrupts.

Quick Trick

Relay detects/decides; circuit breaker interrupts.

Exam Tip

Relay detects/decides; circuit breaker interrupts.

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