High Voltage Engineering — Winter 2019

Describe the working of a Van de Graff generator with a neat sketch.

How electronegative gas is important in high voltage applications? Explain in Detail with advantages.

Explain with neat diagram the principle of operation of an electrostatic voltmeter. Discuss its advantages and limitations for high voltage measurement.

What are Treeing and Tracking? Explain clearly the two processes in solid dielectrics.

Explain Corona discharge.

Explain test facilities and testing equipment’s in high voltage Laboratories.

Explain the partial discharge tests for high voltage cables. How fault is located?

Mention various types of lightning arrestors and write a comprehensive note on Metal oxide arrestors.

Define and explain the following terms with necessary figure:

Statistical time lag ii) formative time lag iii) total time lag.

What is Partial discharge of solid insulating material? Explain in detail.

Describe various factors influencing breakdown in gas.

Discuss High voltage Schering Bridge.

How a sphere gap can be used to measure high voltage? Explain the factor affecting such measurement.

Explain impulse testing of transformers with neat sketch.

Discuss measurement of dielectric constant and loss tangent of capacitor.

Short Notes on Paschan’s law for gaseous insulating medium

Explain various theories for breakdown in commercial liquids.