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In a 132 kV system, the series inductance up to the point of circuit breaker location is 50 mH. The shunt capacitance at the circuit breaker terminal is 0.05 μF. The critical value of resistance required to be connected across the circuit breaker contacts which will given no transient oscillation is:
  • a)
    50000 Ω
  • b)
    50 Ω
  • c)
    5000 Ω
  • d)
    500 Ω
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
In a 132 kV system, the series inductance up to the point of circuit b...
Concept:
 Circuit diagram for the resistance switching of circuit breaker is shown below.
  • Resistance Switching in Circuit Breaker refers to a method adopted for dampening the over voltage transients due to current chopping, capacitive current breaking etc.
  • In this method, a shunt resistance is connected across the contacts of circuit breaker.
  • The main role of shunt resistance R is to limit the growth of re-strike voltage and cause it to grow exponentially up to recovery voltage.
  • R is so selected that the circuit becomes critically damped then re-strike voltage rises exponentially till recovery voltage is reached.
  • The value of R for critical damping is 
  • Resistance Switching also reduces the oscillatory growth of Re-striking Voltage
  • Voltage appearing across the electrodes of circuit breaker or switching voltage or prospective voltage 
Calculation:
Given that V = 132 kV, C = 0.05 μF, L = 50 mH
Critical resistance, 
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In a 132 kV system, the series inductance up to the point of circuit breaker location is 50 mH. The shunt capacitance at the circuit breaker terminal is 0.05 μF. The critical value of resistance required to be connected across the circuit breaker contacts which will given no transient oscillation is:a)50000 Ωb)50 Ωc)5000 Ωd)500 ΩCorrect answer is option 'D'. Can you explain this answer?
Question Description
In a 132 kV system, the series inductance up to the point of circuit breaker location is 50 mH. The shunt capacitance at the circuit breaker terminal is 0.05 μF. The critical value of resistance required to be connected across the circuit breaker contacts which will given no transient oscillation is:a)50000 Ωb)50 Ωc)5000 Ωd)500 ΩCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In a 132 kV system, the series inductance up to the point of circuit breaker location is 50 mH. The shunt capacitance at the circuit breaker terminal is 0.05 μF. The critical value of resistance required to be connected across the circuit breaker contacts which will given no transient oscillation is:a)50000 Ωb)50 Ωc)5000 Ωd)500 ΩCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a 132 kV system, the series inductance up to the point of circuit breaker location is 50 mH. The shunt capacitance at the circuit breaker terminal is 0.05 μF. The critical value of resistance required to be connected across the circuit breaker contacts which will given no transient oscillation is:a)50000 Ωb)50 Ωc)5000 Ωd)500 ΩCorrect answer is option 'D'. Can you explain this answer?.
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