Exam Details
| Subject | power system protection | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | November, 2018 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VII EXAMINATION WINTER 2018
Subject Code:X70901 Date: 15/11/2018
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 neat sketch explain percentage differential protection of alternator.
07
Draw basic protection circuit .Give function of each element. Explain working at the time of fault.
07
Q.2
Explain the requirements of effective protective system.
07
What is PSM and TSM for relays. Which are different time current characteristics of over current relays, explain with diagram.
07
OR
What is ratio error and phase angle error for CT? Give difference between measuring CT and protective CT?
07
Q.3
Explain biased differential protection for power transformer with difficulties and their remedies in brief.
07
What are the limitations of three stepped distance protection? How they can overcome by carrier current protection.
07
OR
Q.3
Discuss the Buchholz relay for transformer protection. When it maloperates.
07
What is meant by loss of excitation in generator? Explain protection to overcome it.
07
Q.4
Explain principle of distance relaying. What do you understand by "over reach" and "under reach" in distance relay.
07
Explain ring main feeder protection
07
OR
Q.4
Derive an expression for the torque produced by an induction relay. What are the merits of induction cup construction over the induction disc construction?
07
Explain restricted earth fault protection of transformer.
07
Q.5
Show the characteristics of following distance relays on R-X diagram. Reactance Relay Mho Relay Impedance Relay. Discuss their suitability for Long, Medium or Short transmission line protection.
07
What are the advantages and disadvantages of numerical relays.
07
OR
Q.5
With the help of block diagram explain organization of Numerical relay.
07
Write brief note on relay testing.
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-VII EXAMINATION WINTER 2018
Subject Code:X70901 Date: 15/11/2018
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 neat sketch explain percentage differential protection of alternator.
07
Draw basic protection circuit .Give function of each element. Explain working at the time of fault.
07
Q.2
Explain the requirements of effective protective system.
07
What is PSM and TSM for relays. Which are different time current characteristics of over current relays, explain with diagram.
07
OR
What is ratio error and phase angle error for CT? Give difference between measuring CT and protective CT?
07
Q.3
Explain biased differential protection for power transformer with difficulties and their remedies in brief.
07
What are the limitations of three stepped distance protection? How they can overcome by carrier current protection.
07
OR
Q.3
Discuss the Buchholz relay for transformer protection. When it maloperates.
07
What is meant by loss of excitation in generator? Explain protection to overcome it.
07
Q.4
Explain principle of distance relaying. What do you understand by "over reach" and "under reach" in distance relay.
07
Explain ring main feeder protection
07
OR
Q.4
Derive an expression for the torque produced by an induction relay. What are the merits of induction cup construction over the induction disc construction?
07
Explain restricted earth fault protection of transformer.
07
Q.5
Show the characteristics of following distance relays on R-X diagram. Reactance Relay Mho Relay Impedance Relay. Discuss their suitability for Long, Medium or Short transmission line protection.
07
What are the advantages and disadvantages of numerical relays.
07
OR
Q.5
With the help of block diagram explain organization of Numerical relay.
07
Write brief note on relay testing.
07
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