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Questions and Answers
What is the main principle of differential protection?
What is the main principle of differential protection?
- Comparing the electrical conditions at the terminals of the equipment (correct)
- Using phasor difference of electrical quantities
- Measuring the magnitude of the fault current
- Applying currents to the relay coils
What is the drawback of the differential protection principle?
What is the drawback of the differential protection principle?
- Restriction to protection of specific electrical equipment (correct)
- Inability to detect small magnitudes of differential currents
- Complexity in the application of CTs
- Dependence on the number of winding in the electrical equipment
What is the main component of a differential protection scheme?
What is the main component of a differential protection scheme?
- Current transformer (CT)
- Differential relay (correct)
- Fault current limiter
- Phasor difference meter
Why is differential protection called unit protection?
Why is differential protection called unit protection?
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What type of differential relays are most commonly used?
What type of differential relays are most commonly used?
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