Exam Details
| Subject | power system protection | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | November, 2017 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VII EXAMINATION WINTER 2017
Subject Code: X70901 Date:02/11/2017
Subject Name: Power System Protection
Time:10:30AM TO 1:00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
State and explain basic requirements of protective system.
07
What is primary and Backup protection? Explain different types of backup protection.
07
Q.2
Define the following terms.
Over reach Under reach Plug setting multiplier CT ratio error
CT phase angle error Burden Seal in relay.
07
What do you understand by a Zone of protection? Discuss various zones of protection for a modern power system.
07
OR
Draw a neat sketch of induction disc type relay and discuss its operating principle
07
Q.3
Explain construction and working of balanced beam type electromechanical relay.
07
Why biased differential relay is preferred over a simple differential relay? Make
a list of applications of a biased differential relay.
07
OR
Q.3
Explain differential protection of transformer.
07
Describe the principle of directional over current relay. How does it help in
discrimination in protection of parallel feeders and ring mains
07
Q.4
Explain the faults in transformer. Explain the construction and working principle of Buchholz relay.
07
Explain protection scheme for alternator.
07
OR
Q.4
What do you mean by field suppression of an alternator? How is it achieved?
07
What are the types of faults that are likely to occur in a three phase induction motor? Distinguish between short circuit protection, overload protection and earth fault protection of motor
07
Q.5
Explain various parts of numerical relay with its block diagram.
07
Explain various types of Installation and commissioning tests for Relay
07
OR
Q.5
What is carrier aided distance protection? What are it s different types? Discuss
the permissive under reach transfer tripping scheme of protection.
07
Explain advantages of numerical relay over electromechanical relay.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VII EXAMINATION WINTER 2017
Subject Code: X70901 Date:02/11/2017
Subject Name: Power System Protection
Time:10:30AM TO 1:00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
State and explain basic requirements of protective system.
07
What is primary and Backup protection? Explain different types of backup protection.
07
Q.2
Define the following terms.
Over reach Under reach Plug setting multiplier CT ratio error
CT phase angle error Burden Seal in relay.
07
What do you understand by a Zone of protection? Discuss various zones of protection for a modern power system.
07
OR
Draw a neat sketch of induction disc type relay and discuss its operating principle
07
Q.3
Explain construction and working of balanced beam type electromechanical relay.
07
Why biased differential relay is preferred over a simple differential relay? Make
a list of applications of a biased differential relay.
07
OR
Q.3
Explain differential protection of transformer.
07
Describe the principle of directional over current relay. How does it help in
discrimination in protection of parallel feeders and ring mains
07
Q.4
Explain the faults in transformer. Explain the construction and working principle of Buchholz relay.
07
Explain protection scheme for alternator.
07
OR
Q.4
What do you mean by field suppression of an alternator? How is it achieved?
07
What are the types of faults that are likely to occur in a three phase induction motor? Distinguish between short circuit protection, overload protection and earth fault protection of motor
07
Q.5
Explain various parts of numerical relay with its block diagram.
07
Explain various types of Installation and commissioning tests for Relay
07
OR
Q.5
What is carrier aided distance protection? What are it s different types? Discuss
the permissive under reach transfer tripping scheme of protection.
07
Explain advantages of numerical relay over electromechanical relay.
07
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