Exam Details
| Subject | power system practice and design | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | April, 2016 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
BE SEMESTER-VII(OLD) • EXAMINATION WINTER 2016
Subject Code: 170903 Date: 23/11/2016
Subject Name: Power System Protection
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
With a neat sketch, describe the percentage differential protection of an alternator.
07
Discuss the protective scheme which protects transformers against faults but does not operate in case of magnetizing inrush current.
07
Q.2
Define Knee point, Aliasing, Incipient fault, Plug setting Multiplier Reach of a relay, Burden, Unit protection.
07
Distinguish between an earth fault relay and an over current relay. Discuss various methods to energize an earth fault relay.
07
OR
Explain the impedance relay characteristics on the R-X diagram. Discuss the range setting of 3 impedance relays placed at a particular location. Why is the first zone unit not set to protect 100 of the line.
07
Q.3
Explain with a neat diagram, the over current protection of a 3 phase feeder against phase faults and earth faults. How many phase fault and earth fault relays are used?
07
Discuss the essential qualities of a protective relay.
07
OR
Q.3
Under what circumstances are over current relays having very inverse and extremely inverse characteristics used?
07
Explain the differential protective scheme for protection of bus-zone.
07
Q.4
What are the limitations of three stepped distance protection? How are they overcome by carrier current protection.
07
Discuss carrier aided directional comparison relaying.
07
OR
Q.4
Discuss area of application of directional over current relays.
07
What do you understand by a zone of protection. Discuss various zones of protection for a modern power system. Why do adjacent protective zones overlap?
07
Q.5
What are the advantages of numerical relays
. Discuss the block diagram of a numerical relay.
07
Discuss the block diagram of finite impulse response filter and Infinite impulse response filter.
07
OR
Q.5
Explain the block schematic diagram of interface for a reactance relay.
07
Write a brief note on the type tests carried out on relays.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
BE SEMESTER-VII(OLD) • EXAMINATION WINTER 2016
Subject Code: 170903 Date: 23/11/2016
Subject Name: Power System Protection
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
With a neat sketch, describe the percentage differential protection of an alternator.
07
Discuss the protective scheme which protects transformers against faults but does not operate in case of magnetizing inrush current.
07
Q.2
Define Knee point, Aliasing, Incipient fault, Plug setting Multiplier Reach of a relay, Burden, Unit protection.
07
Distinguish between an earth fault relay and an over current relay. Discuss various methods to energize an earth fault relay.
07
OR
Explain the impedance relay characteristics on the R-X diagram. Discuss the range setting of 3 impedance relays placed at a particular location. Why is the first zone unit not set to protect 100 of the line.
07
Q.3
Explain with a neat diagram, the over current protection of a 3 phase feeder against phase faults and earth faults. How many phase fault and earth fault relays are used?
07
Discuss the essential qualities of a protective relay.
07
OR
Q.3
Under what circumstances are over current relays having very inverse and extremely inverse characteristics used?
07
Explain the differential protective scheme for protection of bus-zone.
07
Q.4
What are the limitations of three stepped distance protection? How are they overcome by carrier current protection.
07
Discuss carrier aided directional comparison relaying.
07
OR
Q.4
Discuss area of application of directional over current relays.
07
What do you understand by a zone of protection. Discuss various zones of protection for a modern power system. Why do adjacent protective zones overlap?
07
Q.5
What are the advantages of numerical relays
. Discuss the block diagram of a numerical relay.
07
Discuss the block diagram of finite impulse response filter and Infinite impulse response filter.
07
OR
Q.5
Explain the block schematic diagram of interface for a reactance relay.
07
Write a brief note on the type tests carried out on relays.
07
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