Code No: 52215/MT
M.Tech. II-Semester Examinations, July/August-2006.
ADVANCED POWER SYSTEM PROTECTION
(Common to Electrical Power System and Electrical Power
Time: 3 hours Max. Marks: 60
Answer any FIVE questions
All questions carry equal marks
– – –
1.a) Explain, what is meant by primary protection and Back up
b) Define the terms (i) Burden (ii) Pick up (iii) Reset (iv) operating
2.a) State various applications of over current relaying. Distinguish
between inverse characteristic and Definite characteristic.
b) With the help of neat sketches explain the principle of the
(i) Time over current static relay.
(ii) Definite time over current static relay.
3.a) Define the following terms and explain their significance in
distance protection (i) Reach of a distance relay (ii) Underreach.
b) Explain how the arc resistance introduces an error in distance
4.a) What are the merits of carrier current protection? Why should it
be used in impedance or other type of non-unit protection?
b) Explain the phase comparision method of carrier current
5.a) Explain the differential equation technique used for the protection
of Power System Network.
b) What is meant by Walsh-Hadamard transform technique?
Discriminate the Walsh-Hadamard technique with Rationalized
harr transform technique.
6.a) Explain the architecture of a Microprocessor based micro
computer. State clearly the functions of RAM, ROM, CPU, I/o.
b) State the application of Microprocessor in Power System
7.a) Derive the Generalized mathematical expressions for Distance
b) Explain the Microprocessor based reactance relay.
8. Explain the Microprocessor implementation of digital distance