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 | June, 2016 | |
| City, State | new delhi, |
Question Paper
1. Fill in the blanks with most suitable option. Electromagnetic relays are attracted armature type
(ii) digital type
(iii) Neither nor Buchholz relays are used for the protection of a generator
(ii) transformer
(iii) transmission line Compressed air is used in
(i) vacuum circuit breaker
(ii) air break circuit breaker
(iii) air blast circuit breaker
(d) is used to sense the fault.
(i) Relay
(ii) Circuit breaker
(iii) Fuse
(e) The load connected to the secondary of a CT is called pick up value
(ii) burden
(iii) reset value
(f) An amplitude comparator compares the of two input quantities.
(i) magnitudes
(ii) phase angles
(iii) Both and Impedance relays are directional
(ii) non-directional
(iii) Neither nor (ii)
2. Explain the following in the context of relay coordination:
Time grading Current grading Combination of time and current grading Pick up current
3. Derive the general relay equation for directional relays. Explain the construction and operation of an induction type directional overcurrent relay.
4.(a) Derive the basic equation of a mho relay and explain its characteristics. Explain the carrier current protection of transmission lines in detail.
5.(a) Explain the working of differential protection for a 3-phase star connected generator. Explain the construction and operation of a Buchholz relay.
6. Explain the phenomenon of arc quenching in circuit breakers using energy balance theory, and recovery rate theory.
7. A 132 kV alternator is connected to a circuit breaker. The inductive reactance up to the circuit breaker is 4.5 ohm per phase. The
capacitance up to the circuit breaker between phase and neutral is 0.01 uF. Calculate frequency of restriking voltage transient, and maximum value of RRRV.
(ii) digital type
(iii) Neither nor Buchholz relays are used for the protection of a generator
(ii) transformer
(iii) transmission line Compressed air is used in
(i) vacuum circuit breaker
(ii) air break circuit breaker
(iii) air blast circuit breaker
(d) is used to sense the fault.
(i) Relay
(ii) Circuit breaker
(iii) Fuse
(e) The load connected to the secondary of a CT is called pick up value
(ii) burden
(iii) reset value
(f) An amplitude comparator compares the of two input quantities.
(i) magnitudes
(ii) phase angles
(iii) Both and Impedance relays are directional
(ii) non-directional
(iii) Neither nor (ii)
2. Explain the following in the context of relay coordination:
Time grading Current grading Combination of time and current grading Pick up current
3. Derive the general relay equation for directional relays. Explain the construction and operation of an induction type directional overcurrent relay.
4.(a) Derive the basic equation of a mho relay and explain its characteristics. Explain the carrier current protection of transmission lines in detail.
5.(a) Explain the working of differential protection for a 3-phase star connected generator. Explain the construction and operation of a Buchholz relay.
6. Explain the phenomenon of arc quenching in circuit breakers using energy balance theory, and recovery rate theory.
7. A 132 kV alternator is connected to a circuit breaker. The inductive reactance up to the circuit breaker is 4.5 ohm per phase. The
capacitance up to the circuit breaker between phase and neutral is 0.01 uF. Calculate frequency of restriking voltage transient, and maximum value of RRRV.
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