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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...
Transformer with Differentially Connected Relay and Biasing
Differentially connected relay is used to detect the fault in transformer windings. However, there is a possibility of mal-operation of the relay due to the presence of harmonics in the system. Therefore, to prevent the mal-operation of the relay, the relay restraining coil is biased with a specific harmonic.
Harmonic Biasing
Harmonic biasing is the process of adding a specific harmonic component to the restraining coil of the differential relay to reduce the mal-operation of the relay due to the presence of harmonics.
Second Harmonic Biasing
The second harmonic is the most commonly used harmonic for biasing the restraining coils of differential relays. The reason for using the second harmonic is that it has a phase angle of 180 degrees with respect to the fundamental frequency. Hence, it produces a magnetic flux that opposes the flux produced by the fundamental frequency, resulting in a cancellation of harmonics.
Advantages of Second Harmonic Biasing
• It reduces the mal-operation of the differential relay due to the presence of harmonics.
• It does not affect the sensitivity of the differential relay.
• It is easy to implement and does not require additional equipment.
Conclusion
To prevent the mal-operation of the differential relay, the relay restraining coil is biased with a specific harmonic. The second harmonic is the most commonly used harmonic for biasing the restraining coil as it cancels out the harmonics and does not affect the sensitivity of the relay.
Differentially connected relay is used to detect the fault in transformer windings. However, there is a possibility of mal-operation of the relay due to the presence of harmonics in the system. Therefore, to prevent the mal-operation of the relay, the relay restraining coil is biased with a specific harmonic.
Harmonic Biasing
Harmonic biasing is the process of adding a specific harmonic component to the restraining coil of the differential relay to reduce the mal-operation of the relay due to the presence of harmonics.
Second Harmonic Biasing
The second harmonic is the most commonly used harmonic for biasing the restraining coils of differential relays. The reason for using the second harmonic is that it has a phase angle of 180 degrees with respect to the fundamental frequency. Hence, it produces a magnetic flux that opposes the flux produced by the fundamental frequency, resulting in a cancellation of harmonics.
Advantages of Second Harmonic Biasing
• It reduces the mal-operation of the differential relay due to the presence of harmonics.
• It does not affect the sensitivity of the differential relay.
• It is easy to implement and does not require additional equipment.
Conclusion
To prevent the mal-operation of the differential relay, the relay restraining coil is biased with a specific harmonic. The second harmonic is the most commonly used harmonic for biasing the restraining coil as it cancels out the harmonics and does not affect the sensitivity of the relay.
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If a transformer is provided with differentially connected relay. To p...
The transformer having heavy inrush current has 2nd harmonic components.
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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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