GATE EE 2019 Set 1 — Question 62
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Power Systems → Power System Protection → Circuit Breakers
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Question
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 . The critical value of resistance in ohms required to be connected across the circuit breaker contacts which will give no transient oscillation is __________.
Correct answer
500 to 500
Solution
For critical damping (no transient oscillation) in a circuit breaker, the resistance is given by the formula:Given:
- Series inductance
- Shunt capacitance
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