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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. OR Q6) Write short notes on : a) Autoreclosing. b) Vaccume Circuit Breaker advantages and disadvantages. c) Air circuit breaker. [18] SECTION - II Q7) a) b) Draw a neat sketch of Buchholz relay and explain with reference to its operation, installation, merits and limitations. [8] A 11 kV, 3 phase alternator has full load rated current of 200 A. Reactance of armature winding is 15 percent. The differential protection system is set to operate on earth fault currents of more than 200A. Find the neutral earthing resistance, which gives earth fault protection to 90% of stator winding. [8] OR Q8) a) b) Q9) a) b) What are different types of faults occuring in an alternator? Explain each in short. [8] Explain the Merz -Price protection scheme for protection of power transformer which are connected in star-delta configuration. [8] Explain the carrier current protection scheme for long transmission lines. Draw its block diagram and explain working of each block. How is the frequency selected in power line carrier system. [9] Draw the necessary sketches for 3 zone distance protection scheme for transmission lines and explain it. [7] OR Q10)a) b) What do you mean power swings and arc resistance? Explain the effect of power swings and arc resistance on the performance of the distance relay. [8] Explain the principle of distance relaying as applied for the protection of transmission lines. Distinguish between the impedance, reactance and admittance relays as regards to their application in distance protection. [8] [3864] - 231 -2- Q11)a) b) c) Draw a neat block diagram of static relays and explain function of each block. Also compare static relays with conventional relays. [8] Describe the realisation of over current relay by using a microprocessor. [5] Give justifications for preferring half cycle data window over full cycle data window for numerical protective relaying. [5] OR Q12)Write short notes (on any three) : a) Sampling theorem. b) Principle of Duality. c) Amplitude and phase comparator. d) Rationalised Haar Transform (RHT). e) Walsh-Hadamard Transform Technique. [3864] - 231 -3- [18]

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