This document appears to be an exam for a course on Advanced Power System Protection. It contains 8 questions related to different types of power system relays and protection schemes. The questions cover topics like quadrilateral relays, reactance relays, distance relays, MHO relays, static relays, transley schemes, carrier current protection, A/D converters, HAAR transforms, microprocessor-based reactance relays, and the advantages of different relay types. The exam is for a Master's level course and asks students to answer any 5 of the 8 multi-part questions, each worth 12 marks.

1. JNTUW
ORLD
Code No: D4902, D6402
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
M.Tech II - Semester Examinations, March/April 2011
ADVANCED POWER SYSTEM PROTECTION
(COMMON TO ELECTRICAL POWER ENGINEERING, POWER
ENGINEERING & ENERGY SYSTEMS)
Time: 3hours Max. Marks: 60
Answer any five questions
All questions carry equal marks
- - -
1. Write short notes on the following:
a) Quadrilateral Relay.
b) Reactance Relay. [6+6]
2. a) Explain the principle of operation of distance relays and discuss the effect of
power swing and fault impedance on distance relay.
b) Explain the working of a MHO relay. [6+6]
3. a) What are the merits and demerits of a Static relay over electromechanical relay?
b) Draw the block diagram of Static relay and explain various functional blocks with
individual circuits. [6+6]
4. a) Draw a schematic diagram of Transley scheme and explain its principle of
operation.
b) Explain about phase comparison carrier current protection with a neat sketch.
[6+6]
5. a) Explain the working of A/D converter.
b) Write a brief note on rationalized HAAR transform techniques. [6+6]
6. a) Obtain generalized equations for Distance relays and Offset MHO relays.
b) Explain the principle of operation of Microprocessor based Reactance relay with a
suitable diagram. [6+6]
7. a) Discuss the advantages and disadvantages of Static relays as protective devices.
b) Obtain the time current characteristic of Static relay. [6+6]
8. a) Give the merits of distance protection compared to over current protection for
protection of transmission lines.
b) Discuss how to realize different conic characteristics of Distance relays with a
neat diagram. [6+6]
*****
R09
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