Exam Details
| Subject | switchgear | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | May, 2017 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER EXAMINATION SUMMER 2017
Subject Code:X50904 Date: 06/05/2017
Subject Name: SWITCHGEAR
Time: 02.30PM to 05.00PM Total Marks: 7
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Explain slepain's theory of arc interruption and discuss its limitations. How does energy balance theory explain the process of arc extinction?
07
Discuss the following term with reference to circuit breaking:
Rated Breaking capacity
Rated Making capacity
Rated Operating Duty
07
Q.2
Distinguish clearly between recovery voltage and restriking voltage and explain the significance of RRRV in the operation of circuit beaker.
07
Explain capacitor switching duty the a circuit breaker has to perform.
07
OR
Explain the principle, construction of vacuum circuit breakers. Also state the merits of VCBs.
07
Q.3
With neat diagram explain the principle of synthetic testing of circuit breaker. State its advantages.
07
Explain working principle, construction, applications of HVDC circuit breaker.
07
OR
Q.3
Explain Out of phase switching.
07
Explain interruption of short line faults by circuit breaker
07
Q.4
Derive the equation of critical resistance in resistance switching.
07
State the various tests carried out to prove the ability of a circuit breaker. Distinguish between type tests and routine tests.
07
OR
Q.4
Explain the construction, working principle merits and demerits of air break circuit breaker
07
In a 132 KV power system the series inductive reactance and capacitance per phase up to the location of circuit breaker is 6Ω and 0.015 respectively. A resistance of 600 Ω is connected across the contacts of circuit breaker. Determine the following when the circuit breaker opens:
Natural frequency of transient oscillations.
Damped frequency of oscillations
(iii)Critical value of damping resistance, which will give no transient oscillations.
07
Q.5
Explain the construction, working principle, merits and demerits of minimum oil circuit breaker.
07
Explain the construction, working principle merits and demerits of air blast circuit breaker
07
OR
2
Q.5
Explain the construction, working principle of Puffer type SF6 circuit breaker with neat diagram.
07
Explain the phenomenon of current chopping and its effects on circuit interruption. What measures are taken to reduce it?
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER EXAMINATION SUMMER 2017
Subject Code:X50904 Date: 06/05/2017
Subject Name: SWITCHGEAR
Time: 02.30PM to 05.00PM Total Marks: 7
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1
Explain slepain's theory of arc interruption and discuss its limitations. How does energy balance theory explain the process of arc extinction?
07
Discuss the following term with reference to circuit breaking:
Rated Breaking capacity
Rated Making capacity
Rated Operating Duty
07
Q.2
Distinguish clearly between recovery voltage and restriking voltage and explain the significance of RRRV in the operation of circuit beaker.
07
Explain capacitor switching duty the a circuit breaker has to perform.
07
OR
Explain the principle, construction of vacuum circuit breakers. Also state the merits of VCBs.
07
Q.3
With neat diagram explain the principle of synthetic testing of circuit breaker. State its advantages.
07
Explain working principle, construction, applications of HVDC circuit breaker.
07
OR
Q.3
Explain Out of phase switching.
07
Explain interruption of short line faults by circuit breaker
07
Q.4
Derive the equation of critical resistance in resistance switching.
07
State the various tests carried out to prove the ability of a circuit breaker. Distinguish between type tests and routine tests.
07
OR
Q.4
Explain the construction, working principle merits and demerits of air break circuit breaker
07
In a 132 KV power system the series inductive reactance and capacitance per phase up to the location of circuit breaker is 6Ω and 0.015 respectively. A resistance of 600 Ω is connected across the contacts of circuit breaker. Determine the following when the circuit breaker opens:
Natural frequency of transient oscillations.
Damped frequency of oscillations
(iii)Critical value of damping resistance, which will give no transient oscillations.
07
Q.5
Explain the construction, working principle, merits and demerits of minimum oil circuit breaker.
07
Explain the construction, working principle merits and demerits of air blast circuit breaker
07
OR
2
Q.5
Explain the construction, working principle of Puffer type SF6 circuit breaker with neat diagram.
07
Explain the phenomenon of current chopping and its effects on circuit interruption. What measures are taken to reduce it?
07
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