Following Paper illand Roll No. to be filled in your Answer Book) Roll No.
B.Tech. (SEM. VII) OOD SE~ESTERTHEORY
EXAMINATION
2010-11
SWTICHGEAR
Note:
AND PROTECTION
(1) Attempt all questions. (2) All questions carry equal marks (3) Be precise in your answers. (4) No Second Answer book will be provided.
(a)
What is a zone of protection ? Discuss various zones of protection of a power system with the help ofline diagram .
•
(b)
hat are basic requirements
of protective
relaying
schemes? (c)
Derive an expression for torque produced in an induction relay.
(a)
Explain the concept of duality in static comparators.
(b)
Discuss
the coincidence
comparators.
principle
used in phase
What do you mean by time multiplier setting (TMS) and plug multiplier setting of an over current relay? Explain with the help of relay characteristics.
(a)
Explain stepped a time-distance characteristics of three distance relaying units used for fIrst, second and third zones of protection.
(a)
Discuss different methods of interrupting the arc current in circuit breakers. Explain two main theories of current zero interruption.
5.
Attempt any two parts of the following: (a)
(lOx2=20)
Explain with a neat diagram the method of harmoniccurrent restraint for protection of a transformer.
(b)
A 13.8 kV, 125 MVA, star connected alternator has a asynchronous reactance of 1.4 pulphase and negligible resistance. It is pr.otected by a Merz-Price balanced current system which operates
when out of balance current
exceeds 10% of the full load current. If the neutral point is earthed through a 2 n resistor, determine what portion of the winding is p,rotected against earth fault. (c)
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