GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code:2182407 Date:17/05/2019Subject Name:Switch Gear & 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.
Q.1 (a) Draw the schematic diagram of single phase sub-station. 03
(b) Explain trip circuit and its operation with necessary diagrams. 04
(c) Define RRRV. Derive the equation for RRRVmax. 07
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Q.2 (a) Define fault condition and types of abnormal condition. 03
(b) Give advantages of SF6 circuit breaker. 04
(c) Explain current chopping with relevant diagram. 07
OR
(c) Draw and explain Air Break circuit breaker. 07
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Q.3 (a) Explain the following term: (i) Switch-gear, (ii) Lightning arrester and (iii) Earthing switch 03
(b) Compare Static versus Electromagnetic relays. 04
(c) Explain Percentage Differential Protection of Transformer with necessary diagrams. 07
OR
Q.3 (a) Explain characteristics of over current protection relays. 03
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(b) Compare Induction Disc and Induction Cup relays in tabular form. 04(c) Explain the construction and working principle of Buchholz relay. 07
Q.4 (a) Compare Vaccum circuit breaker and Oil circuit breaker in brief. 03
(b) Explain Inter-turn fault protection scheme for generator. 04
(c) Write a short note on Directional relay. 07
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ORQ.4 (a) Explain microprocessor based relay in brief. 03
(b) Explain the protection of generator against stator and rotor faults. 04
(c) Explain Distance relay with its different characteristics. 07
Q.5 (a) Explain Translay relay in brief. 03
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(b) Explain attracted armature relay. 04(c) Explain the construction and working principle of Zinc Oxide lightning arrester. 07
OR
Q.5 (a) Give difference between bushing and isolator. 03
(b) What is the need of Neutral grounding? Explain any one method of Neutral Grounding. 04
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(c) Explain the carrier current based transmission line protection scheme with block diagram. 07--- Content provided by FirstRanker.com ---
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