Download GTU BE/B.Tech 2019 Winter 7th Sem New 2170908 Switch Gear And Protection Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019

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Subject Code: 2170908 Date: 26/11/2019
Subject Name: Switch Gear and Protection
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) With neat diagram explain the working of shaded pole type 03
electromagnetic induction disc relay.

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(b) Classify the types of relays with respect to different category. 04

(c) Explain the following protection scheme as applied to synchronous 07
generator:
(a) Loss of excitation protection
(b) Stator inter-turn fault protection

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Q.2 (a) Discuss the difficulties in implementing HVDC circuit breaker. 03

(b) Explain the behavior of Merz—Price protection during normal load, 04
external fault and internal fault condition.

(c) Compare the performance of distance relay in respect of its sensitivity to 07
following:

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(a) Effect of arc resistance,
(b) Effect of power swing
(c) Directional property

OR

(c) Select CT ratios and determine the TMS, and Plug setting of the IDMT 07

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relays at location O and A, for the over-current protection of radial feeder
shown in Fig.1. The characteristic.of IDMT relay is given in the Table-2.
Minimum fault currents at each point are given Table-1. Maximum load
current from each bus are‘indicated in the Fig .

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