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Gujarat Technological University

This document outlines the examination details for the High Voltage Engineering course at Gujarat Technological University for Winter 2024, including subject code, date, time, and total marks. It provides a list of questions covering various topics such as breakdown strength, corona discharge, and impulse generators, with specific marks allocated to each question. Students are instructed to attempt all questions and make suitable assumptions where necessary.

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21 views2 pages

Gujarat Technological University

This document outlines the examination details for the High Voltage Engineering course at Gujarat Technological University for Winter 2024, including subject code, date, time, and total marks. It provides a list of questions covering various topics such as breakdown strength, corona discharge, and impulse generators, with specific marks allocated to each question. Students are instructed to attempt all questions and make suitable assumptions where necessary.

Uploaded by

dannydhanraj56
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Enrolment No.

/Seat No_______________

GUJARAT TECHNOLOGICAL UNIVERSITY


BE- SEMESTER–VII (NEW) EXAMINATION – WINTER 2024
Subject Code:3170917 Date:30-11-2024
Subject Name:High Voltage Engineering
Time:10:30 AM TO 01:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Why is the breakdown strength higher in electronegative gases than in other gases? 03
(b) Obtain current growth equation due to Townsend’s first and second ionization 04
coefficients.
(c) What are the mechanisms by which lightning strokes develop and induce over voltages on 07
overhead power lines?

Q.2 (a) Explain suspended particle theory related to liquid breakdown. 03


(b) What are the commercial liquids? Explain purification test cell system related to liquids. 04
(c) Explain corona discharge. What are different factor affecting Corona losses? How 07
Corona loss can be eliminated?
OR
(c) What is paschen’s law? Explain minimum voltage for breakdown under a given pd 07
condition.

Q.3 (a) Explain Metal Oxide Arrestor. 03


(b) Explain generating voltmeters used for measuring high voltage. 04
(c) Describe the working of a Van de Graff generator with a neat sketch. 07
OR
Q.3 (a) What is surge arrester? Explain it’s application in power system. 03
(b) Discuss the method of balanced detection for locating partial discharges in electrical 04
equipments.
(c) Explain cascade transformer unit with isolating transformer for high alternating 07
voltage generation.

Q.4 (a) Explain how a sphere gap can be used to measure the peak value of voltages. 03
(b) List out the common test facilities available in High Voltage Lab. 04
(c) A 12 stage impulse generator has 0.126µF capacitors. The wave front and wave tail 07
resistances connected are 800Ω and 5000Ω respectively. If the load capacitor is 1000pF,
find the front and tail times of the impulse wave produced.
OR
Q.4 (a) Explain Trigatron gap. 03
(b) Enlist factors affecting ionization process and state processes responsible for gaseous 04
breakdown.
(c) Discuss the modified Marx circuit for generating an impulse wave and components used 07
in it.

Q.5 (a) Discuss power frequency tests of insulator. 03


(b) What is Finite Element Method? Brief it for solving the field problems 04
(c) What is meant by insulation co-ordination? How are the protective devices chosen 07
for optimal insulation level in a power system?
OR

1
Q.5 (a) Discuss Hall effect in Hall generator. 03
(b) Give comparison between uniform and non-uniform field. 04
(c) A steady current of 600µA flows through the plane electrodes separated by a distance 07
of 0.5cm when a voltage of 10kV is applied. Determine the Townsend’s first
ionization constant if a current of 60µA flows when the distance of separation is
reduced to 0.1cm and the field is kept constant at previous value.

**********

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