Exam Details
| Subject | Switchgear And Protection | |
| Paper | ||
| Exam / Course | Diploma -VIEP-Electrical Engineering (DELVI)/Advanced Level Certificate Course In Electrical Engineering (ACELVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2015 | |
| City, State | new delhi, |
Question Paper
1. Define and explain the following terms as applied in protective relaying:
Pick-up value
Current setting
Plug setting multiplier
Time setting multiplier
2. Describe the construction and principle of operation of an induction type directional over-current relay.
3. Explain the principle of operation of an impedance relay with the help of its characteristic. Also draw a typical reactance relay characteristics.
4. Draw a schematic diagram of a phase comparison that carries current protection and explain the function of each block/apparatus shown in the schematic diagram.
5. An 11 kV, 100 MVA alternator is grounded through a resistance of 5 Q. The C.T. have a ratio of 1000/5. The relay is set to operate when there is an out of balance current of 1 A. What percentage of the generator winding will be protected by percentage differential scheme of protection
6. What is the effect of resistance in the star point earthing Suggest a scheme for differential protection of a generator transformer unit. Draw and explain the scheme.
7. With the help of a neat sketch, explain the construction and working of a Buchholz relay used in protection of transformers.
8. Explain the construction and working of a bulk oil circuit breaker and give its applications.
9. With the help of neat sketches, explain the construction and working of vacuum and SF6 circuit breaker in brief.
10. Write short notes on any two of the following:
Circulating current protection of bus bar
Directional earth fault relay
30° connection diagram of directional relay
Recovery rate theory of current interruption
Pick-up value
Current setting
Plug setting multiplier
Time setting multiplier
2. Describe the construction and principle of operation of an induction type directional over-current relay.
3. Explain the principle of operation of an impedance relay with the help of its characteristic. Also draw a typical reactance relay characteristics.
4. Draw a schematic diagram of a phase comparison that carries current protection and explain the function of each block/apparatus shown in the schematic diagram.
5. An 11 kV, 100 MVA alternator is grounded through a resistance of 5 Q. The C.T. have a ratio of 1000/5. The relay is set to operate when there is an out of balance current of 1 A. What percentage of the generator winding will be protected by percentage differential scheme of protection
6. What is the effect of resistance in the star point earthing Suggest a scheme for differential protection of a generator transformer unit. Draw and explain the scheme.
7. With the help of a neat sketch, explain the construction and working of a Buchholz relay used in protection of transformers.
8. Explain the construction and working of a bulk oil circuit breaker and give its applications.
9. With the help of neat sketches, explain the construction and working of vacuum and SF6 circuit breaker in brief.
10. Write short notes on any two of the following:
Circulating current protection of bus bar
Directional earth fault relay
30° connection diagram of directional relay
Recovery rate theory of current interruption
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
- National Centre for Disability Studies (NCDS)
- School of Agriculture (SOA)
- School of Computer and Information Sciences (SOCIS)
- School of Continuing Education (SOCE)
- School of Education (SOE)
- School of Engineering & Technology (SOET)
- School of Extension and Development Studies (SOEDS)
- School of Foreign Languages (SOFL)
- School of Gender Development Studies(SOGDS)
- School of Health Science (SOHS)
- School of Humanities (SOH)
- School of Interdisciplinary and Trans-Disciplinary Studies (SOITDS)
- School of Journalism and New Media Studies (SOJNMS)
- School of Law (SOL)
- School of Management Studies (SOMS)
- School of Performing Arts and Visual Arts (SOPVA)
- School of Performing Arts and Visual Arts(SOPVA)
- School of Sciences (SOS)
- School of Social Sciences (SOSS)
- School of Social Work (SOSW)
- School of Tourism & Hospitality Service Sectoral SOMS (SOTHSM)
- School of Tourism &Hospitality Service Sectoral SOMS (SOTHSSM)
- School of Translation Studies and Training (SOTST)
- School of Vocational Education and Training (SOVET)
- Staff Training & Research in Distance Education (STRIDE)
Subjects
- Basics of Electrical Engineering
- C - Programming
- Computer Applications In P.S.
- Control Systems
- Digital Control System
- Digital Control System Design
- Dynamics System Simulation
- Electrical Circuit Theory
- Electrical Engineering Material
- Electrical Installation and System
- E l e c t r i c a l M a c h i n e T h e o r y I I
- Electrical Machines-I
- Electrical Measurements And Instruments
- Electrical Power Transmission and Distribution
- Energy Audit
- Flexible Ac Transmission System
- Industrial Drives and Controls
- Mechatronics
- Power Generation System
- Power Plant Economics And Centering
- Power System Reliability
- Principles of Computer Architecture
- Special Electrical Machines
- Switchgear And Protection
- Utilization Of Electrical Engineering