Scribd
Upload
23 views2 pages

SGP (Eee)

The document outlines the examination structure for the Switchgear and Protection course at Lendi Institute of Engineering & Technology, detailing the format and topics covered in the March 2023 supplementary exams. It includes five units with specific questions related to circuit breakers, protective relays, alternator protection, 3-zone protection, and overvoltage effects. Each question is designed to assess understanding and knowledge in electrical engineering principles relevant to the course.

Uploaded by

lsk Saikrishna
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
23 views2 pages

SGP (Eee)

The document outlines the examination structure for the Switchgear and Protection course at Lendi Institute of Engineering & Technology, detailing the format and topics covered in the March 2023 supplementary exams. It includes five units with specific questions related to circuit breakers, protective relays, alternator protection, 3-zone protection, and overvoltage effects. Each question is designed to assess understanding and knowledge in electrical engineering principles relevant to the course.

Uploaded by

lsk Saikrishna
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

R19EEE-PC3203 R19

LENDI INSTITUTE OF ENGINEERING & TECHNOLOGY (AUTONOMOUS)


Permanently Affiliated to JNTUK, Kakinada
Jonnada: Vizianagaram
III B. Tech, II-Semester Supplementary Examinations, March-2023
Switchgear and Protection
(EEE Only)
Date: 14-03-2023 Time: 3 Hours. Max. Marks: 70
Answer ONE Question from each UNIT and each question carries 14 Marks

UNIT-1
1. (A) Explain the fundamental difference in the operation of an isolator and a circuit
breaker. [7 Marks,CO1, Understand]
(B) Explain the principle of operation of DC circuit breaker in detail.
[7 Marks,CO1, Understand]
(OR)
2. (A) Discuss the process of arc extinction in the medium of oil and what
characteristics it should have? Discuss the various types of OCBs used in power
network. [7 Marks,CO1, Remember]
(B) What is the effect of opening the C.B. connecting an unloaded transmission
line? Explain briefly. [7 Marks,CO1, Understand]
UNIT-2
3. (A) Summarize the role of protective relay in a modern power system.
[7 Marks,CO2,Remember]
(B) Explain about the directional relay in details. [7 Marks,CO2,Understand]
(OR)
4. (A) Explain about instantaneous over current relay in details.
[7 Marks,CO2,Understand]
(B) Summarize the role of protective relay in a modern power system
[7 Marks,CO2,Remember]
UNIT-3
5. (A) What are the abnormal conditions in a large alternator against which
protection is necessary? [7 Marks,CO3,Remember]
(B) Explain about the rotor protection against earth fault in detail.
[7 Marks,CO3, Understand]
(OR)
6. (A) What are the different types of protection used for alternator? Explain in
detail. [7 Marks,CO3,Understand]
(B) What is restricted earth fault protection for alternators? Why is this form of
protection used for alternators even though it does not provide protection for the
complete winding? [7 Marks,CO3,Understand]

Page 1 of 2
UNIT-4
7. (A) What is meant by 3-zone protection? Give such schemes of protection for
(i) short length lines, (ii) medium length lines, and (iii) long lines.
[7 Marks,CO4,Remember]
(B) Explain about a scheme of protection for a ring main having three substations
and fed from one end. [7 Marks,CO4,Understand]
(OR)
8. (A) With schematic diagrams of 3-zone protection. Explain the principle of
operation. [7 Marks,CO4,Understand]
B) Give various schemes of protection for feeders and compare their performance.
[7 Marks,CO4,Remember]
UNIT-5
9. (A)Define the characteristics of amplitude comparator.
[7 Marks,CO5,Remember]
(B) What are the effects of over voltage on power systems? Explain briefly.
[7 Marks,CO5,Understand]
(OR)
10. (A) Explain the causes of over voltage in power system.
[7 Marks,CO5,Understand]
(B) What is voltage surge in power system? Explain.
[7 Marks,CO5,Understand]

----THE END----

Page 2 of 2

You might also like