GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION - SUMMER 2019
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Subject Code: 170903 Date: 16/05/2019Subject Name: Power System Protection
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Describe the principle of circulating current differential Protection (07)
(b) Enlist causes of faults and differentiate unit type protection and non unit type protection. (07)
Q.2 (a) Discuss the important requirements to be satisfied by a protective system. (07)
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(b) Explain the working principle of induction type electromagnetic relays. (07)OR
(b) Why is back up protection required? Discuss different types of back-up protections used. (07)
Q.3 (a) Define the following terms as applied to protective relays. (07)
(1) Burden (2) Selectivity and discrimination (3) Reach (4) Plug setting multiplier.
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(b) Explain the faults in transformer. Explain the construction and Working Principle of Buchholz relay. (07)
OR
Q.3 (a) Design schematic diagram of carrier current protection of transmission line and describe it. (07)
(b) Restricted earth fault protection is provided to alternators though it does not protect the complete wiring against earth faults. Justify this type of protection. (07)
Q.4 (a) Discuss the 3 zone protection of transmission lines using impedance relays (07)
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(b) Explain under reach and over reach of distance relay. (07)OR
Q.4 (a) Present characteristics of following distance relays with their applications (07)
(1) Mho relay (ii) off set.mho relay (iii) reactance relay.
(b) Explain Differential protection of alternator with diagram. (07)
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Q.5 (a) Draw the block diagram of a numerical relay and explain the working of each block. (07)
(b) List the type tests carried out on the relays. Discuss any three of them. (07)
OR
Q.5 (a) Explain the installation and commissioning test of relays in brief. (07)
(b) Explain current, time and current-time discrimination methods of protection of transmission line. (07)
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