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30. a. ii. 3Lai ii. ii. 32. ai. ii. ii. Page 4 of 4 With a neat sketch, discuss the operation of phase comparison carrier current protection for a transmission line. Describe the operating principle and application of air blast circuit breaker. (OR) i. Write in detail about any two methods of arc interruption. Enumerate various properties of SF, gas. Describe the protection of station and sub-station against direct lightning strokes. Write short notes on (1) Rod gap (2) Arcing horn (OR) i. What is Peterson coil? What protective functions are performed by Peterson coil? Explain volt-time curve arid terminology associated with impulse testing. Draw the block diagram of a typical numerical differential relay and explain its function. Explain the advantages of FPGA based relays over conventional relays. (OR) i. What are the properties and capabilities of artificial intelligerice to power system protection? Draw the block diagram of a typical numerical relay. List its advantages and disadvantages. eR EK 10DF1-8/15EE302 Note: @ Gi) Time: Three Hours Page 1 of 4 B.Tech. DEGREE EXAMINATION, DECEMBER 2019 First to Eighth Semester Reg, No. 15EE302 — POWER SYSTEM PROTECTION (For the candidates admitted during the academic year 2015 ~ 2016 to 2017-2018) Part - A should be answered in OMR sheet within first 45 minutes and OMR sheet should be handed over to hall invigilator-at the end of 45" minute. Part - B and Part - C should be answered in answer booklet. Max. Marks: 100 PART — A (20 x 1 =20 Marks) Answer ALL Questions . The relay used to protect electrical machines against overheating due to unbalanced current is (A) Zero sequence relay (C) Monitoring relay (B) Negative sequence relay (D) Biased relay . The rated secondary current of CT is 5A. Plug setting is 3.75 A. Power consumption is 4 VA. The VA burden of relay is (A) 7VA (B) 7.11 VA (C) 69VA (D) 6.7VA The condition for the distance relay to operate is (A) Z
