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2003 Course Switchgear & Protection

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 231 P 1063 B.E. (Electrical) SWITCHGEAR & PROTECTION (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 questions from each section. 2) Answer 3 questions from Section I and 3 questions from Section II. 3) Answers to the two sections should be written in separate books. 4) Neat diagrams must be drawn wherever necessary. 5) Figures to the right indicate full marks. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) b) What do you mean by zones of protection? Explain what is primary protection & backup protection? [8] Explain the concept of directional over current protection and explain the principle, construction of directional over current relay. [8] OR Q2) a) b) What are the essential qualities of protective relaying? Derive the torque equation in induction type relay. [8] [8] Q3) a) b) Explain high & low resistance principles of arc interruption. Define and derive RRRV. [8] [8] OR Q4) a) b) Explain the resistance switching in case of circuit breaker. Explain what is current chopping. Q5) a) Describe in detail the terms related to circuit breaker [9] i) Making capacity. ii) Breaking capacity. iii) Rated interrupting duties. Draw the neat sketch & explain in detail the construction & working [9] principle of SF6 circuit breaker. b) [8] [8] P.T.O.

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