Tuesday, January 24, 2023

Dr. A.P.J. Abdul Kalam University MTECH I SEM (PS) Advance Power System Protection Relays [MTPS103] Dec 2020 Question Paper

Dr. A.P.J. Abdul Kalam University

Master of Technology

First Semester Main Examination, Dec-2020

Advance Power System Protection Relays [MTPS103]

Time: 3:00 Hrs Max Marks 70

Note: Attempt any five questions out of eight. All questions carry equal marks.

Q.1 (a) Enlist the advantages and disadvantages of static relays. Explain the different

types of amplitude and phase comparators with neat sketches.

(b) What is Protective relay? Explain its functional characteristics.

Q.2 (a) Explain sampling circuit and zero crossing detector.

(b) Explain the principle of operation of distance relays and discuss the effect of

power swing and fault impedance on distance relay.

Q.3 (a) Explain the working principle of directional and non- directional type over

current relays.

(b) Explain the construction, working principle and characteristics of reactance type

distance relays.

Q.4 (a) Explain the construction, working principle and characteristics of percentage

differential relay for internal and external fault.

(b) Draw the block diagram of Static relay and explain various functional blocks

with individual circuits.

Q.5 (a) Explain the Duality between of amplitude and phase comparators.

(b) Explain the carrier system of protection. With the block diagram and neat

sketches discuss how the phase comparison scheme can be used for protecting a

transmission line.

Q.6 (a) What causes loss of Prime movers? Explain it.

(b) Explain earth fault protection. Explain Generator transformer unit protection

Q.7 (a) Explain high impedance bus differential scheme for bus bar protection.

(b) Describe with block diagram the principle of operation of microprocessor based

percentage differential relay scheme for the operation of a power transformer.

Q.8 Write Short notes on

(a) Time delay cuts and level detectors

(b) Hall effect comparator

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