11-06-2013, 04:53 PM
SEMESTER EXAMINATIONS FOR ADVANCED POWER SYSTEM PROTECTION
ADVANCED POWER.pdf (Size: 21.41 KB / Downloads: 33)
Answer any five questions
All questions carry equal marks
1.a) Mention the merits and demerits of static relays in power system protection.
b) Explain clearly the primary and back up protection in power systems.
2. Explain the different types of amplitude and phase comparators with neat sketches.
3. Explain the principle of operation of the following with block diagram.
a) Inverse-time over-current relay
b) Definite time over-current relay
4. Realize the reactance relay and MHO relay using sampling comparator.
5. Explain the effect of Power surges (Power swings) on the performance of distance relays.
6. Explain the following Wire pilot protection schemes
(i) Circulating current scheme
(ii) Opposed voltage scheme.
(iii) Transley scheme
(iv) Transely ‘S’ protection.
7. Explain the principle of operation of Microprocessor based
a) Impedance Relay
b) Reactance Relay
with flowchart and block diagram.
8. Derive the generalized mathematical expression for distance relays and realize the various types of distance relays using microprocessor based approach.