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Note: i) Attempt any five questions.
ii) All questions carry equal marks.
Explain construction, working, torque equation and characteristics of following distance relays.
a) Admittance Relay
b) Impedance Relay
a) What is a static relay? What are the merits and demerits of static relays over electromagnetic relays?
b) Explain the types of phase comparators?
a) What is Hall Effect? Explain the working of the Hall Effect?
b) Derive generalized mathematical equation for amplitude and phase comparison.
Write short note on:
a) Square wave generator
b) Level detectors
c) Sampling circuit
d) Output-device
a) State the importance of bus-bar protection. Explain the differential protection system for bus-bar protection.
b) Describe the distance protection scheme for the protection of transmission lines.
a) What is a phase compensation carrier protection? State its function in transmission system.
b) Explain the components of a protective system?
What are the differences between digital, computer aided and microprocessor based relays? Discuss flow chart of microprocessor based under voltage relay. State advantage of modern relay over conventional (EM) relay.
Write short note on any two of following.
a) Mho Relay
b) Under and over frequency Relay
c) Wide Area Measurement System (WAMS)
d) SF6 and Vacuum Circuit Breaker