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High Voltage Engineering

C.L. Wadhwa

Chapter 1

Breakdown Mechanism of Gaseous, Liquid and Solid Materials - all with Video Answers

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Chapter Questions

00:24

Problem 1

Discuss various factors which affect breakdown of gases.

Mari Davey
Mari Davey
Numerade Educator

Problem 2

. Define Townsend's first and second ionisation coefficients. Explain the Townsends criterion for a spark.

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Problem 3

State and explain Paschen's law. How do you account for the minimum voltage for breakdown under a given $p d$ condition?

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Problem 4

Explain the mechanism of development of anode and cathode streamers and explain how these lead to breakdown.

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Problem 5

What is time-lag? Discuss its components and the factors which affect these components.

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Problem 6

Explain briefly various theories of breakdown in liquid dielectrics.

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Problem 7

Explain clearly suspended particle mechanism of liquid breakdown.

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Problem 8

State various process which lead to formation of bubbles in liquid dielectrics and explain clearly cavity breakdown mechanism in liquid dielectrics.

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Problem 9

What is electroconvection? Explain liquid breakdown based on electroconvection.

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01:15

Problem 10

Discuss various criteria suggested by researchers for transition from avalanche to streamer.

Ajay Singhal
Ajay Singhal
Numerade Educator
01:17

Problem 11

Explain Penning Effect when referred to gaseous discharges.

Ren Jie Tuieng
Ren Jie Tuieng
Numerade Educator
02:01

Problem 12

What is corona discharge? Explain clearly Anode and Cathode coronas.

Shahina -
Shahina -
Numerade Educator

Problem 13

Describe briefly various mechanism of breakdown in solids.

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Problem 14

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

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Problem 15

Derive an expression for maximum thermal voltage and show that the voltage is independent of thickness of specimen. State clearly the assumptions made.

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Problem 16

Derive an expression for critical electric field and show that the field is independent of the critical temperature of the dielectric. State the assumptions made.

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Problem 17

What do you mean by 'Intrinsic strength' of a solid dielectric? Explain electric breakdown of solid dielectrics.

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Problem 18

Explain Thermal breakdown in solid dielectrics. How this mechanism is more significant than the other mechanisms?

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Problem 19

Explain the process of breakdown in electronegative gases.

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01:27

Problem 20

Explain the application of oil in power apparatus and discuss clearly its function with reference to a circuit breaker.

Ankur S
Ankur S
Numerade Educator

Problem 21

Describe the main requirements of solid insulating materials used for power apparatus and describe the dielectric characteristics of the following material:
(i) vulcanized rubber (ii) PVC (iii) cross-link polyethylene (iv) insulating press board (v) mica (vi) ceramics (vii) glass (viii) epoxy resins.

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Problem 22

Describe the application of various insulating materials used in the following power apparatus:
(i) Power transformers
(ii) Circuit breakers
(iii) Rotating machines
(iv) Power cables
(v) Power capacitors
(vi) Capacitor bushings

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Problem 23

Explain clearly various processes which explain electric breakdown in vacuum.

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Problem 24

What is "conditioning of elecrodes"? How does it affect breakdown in vacuum?

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01:21

Problem 25

Discuss the effect of "Area of electrode" and "Effect of pressure" on the breakdown of vacuum.

Ajay Singhal
Ajay Singhal
Numerade Educator
01:03

Problem 26

Discuss the application of gases in electric power apparatus.

Narayan Hari
Narayan Hari
Numerade Educator