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If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay restraining coil is biased with __________.
- a)3rd harmonic
- b)2nd harmonic
- c)7th harmonic
- d)5th harmonic
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
If a transformer is provided with differentially connected relay. To p...
- To prevent maloperation of a differentially connected relay in a transformer, the restraining coil of the relay is biased with the 2nd harmonic.
- The differential protection relay is used to detect internal faults in the transformer by comparing the currents entering and leaving the transformer windings. However, during normal operation, there might be slight imbalances or inrush currents that could cause false tripping of the relay. Biased restraint is used to ensure that the relay operates only during actual internal faults and remains stable during normal and transient conditions.
- By biasing the restraining coil with the 2nd harmonic, the relay becomes more sensitive to the differential current during a fault condition while providing adequate restraint during normal and transient conditions.
- Therefore, the correct answer is: B: 2nd harmonic
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If a transformer is provided with differentially connected relay. To p...
Explanation:
Differentially Connected Relay:
- In differential protection schemes, two currents are compared (usually the current entering and leaving a protected zone) to determine if a fault has occurred.
Relay Restraining Coil:
- The restraining coil in a differential relay is used to prevent mal-operation of the relay during inrush or external fault conditions.
Biased with 2nd Harmonic:
- Biasing the restraining coil with the 2nd harmonic component helps in providing adequate restraint to the relay during normal operating conditions.
- The 2nd harmonic component is used because it is present in the differential current during internal faults but not during inrush or external fault conditions.
- By biasing the restraining coil with the 2nd harmonic, the relay can accurately detect internal faults while ignoring external disturbances.
Conclusion:
- Biasing the relay restraining coil with the 2nd harmonic component ensures reliable operation of the differential protection scheme by providing the necessary restraint during fault conditions.
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If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay restraining coil is biased with __________.a)3rd harmonicb)2nd harmonicc)7th harmonicd)5th harmonicCorrect answer is option 'B'. Can you explain this answer?
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