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A) Explain briefly various theories of breakdown in liquid dielectrics. B) What are the requirements of a sphere gap for measurement of high voltages? Discuss the advantages and disadvantages of sphere gap for measurements.

A) Explain briefly various theories of breakdown in liquid dielectrics. B) What are the requirements of a sphere gap for measurement of high voltages? Discuss the advantages and disadvantages of sphere gap for measurements.

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Q5 Choose Two only A) Explain briefly various theories of breakdown in liquid dielectrics. B) What are the requirements of a sphere gap for measurement of high voltages? Discuss the advantages and disadvantages of sphere gap for measurements. C) Determine the Townsend's first ionization coefficient if a steady current of 500 µA flows through the plane electrode separated by a distance of 0.4cm when a voltage of 10 kV is applied. A current of 25 µA flows when the distance of separation is reduced to 0.1 cm and the field is kept constant at the previous value. Find also the value of y if the breakdown took place when the gap distance was changed to 0.7 cm.
Transcribed Image Text:Q5 Choose Two only A) Explain briefly various theories of breakdown in liquid dielectrics. B) What are the requirements of a sphere gap for measurement of high voltages? Discuss the advantages and disadvantages of sphere gap for measurements. C) Determine the Townsend's first ionization coefficient if a steady current of 500 µA flows through the plane electrode separated by a distance of 0.4cm when a voltage of 10 kV is applied. A current of 25 µA flows when the distance of separation is reduced to 0.1 cm and the field is kept constant at the previous value. Find also the value of y if the breakdown took place when the gap distance was changed to 0.7 cm.
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