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If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay relay operating coil is biased with ______
- a)3rd harmonic
- b)2nd harmonic
- c)7th harmonic
- d)5th harmonic
Correct answer is option 'D'. Can you explain this answer?
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If a transformer is provided with differentially connected relay. To p...
To prevent maloperation of a differentially connected relay in a transformer, the relay operating coil is often biased with the 5th harmonic component of the current. This is done to provide a bias or offset to the relay, ensuring that it operates only when there is a fault or abnormal condition in the transformer.
Harmonics are additional frequency components that can be present in the current waveform of a power system. In transformers, the 5th harmonic component is commonly used for biasing the relay. By biasing the relay with the 5th harmonic, it becomes less sensitive to normal operating conditions and more responsive to fault conditions, reducing the chances of false tripping or maloperation.
The specific harmonic used for biasing may vary depending on the design and application of the relay, but the 5th harmonic is a commonly used choice.
Therefore, the correct answer is D: 5th harmonic.
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If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay relay operating coil is biased with ______a)3rd harmonicb)2nd harmonicc)7th harmonicd)5th harmonicCorrect answer is option 'D'. Can you explain this answer?
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