Why capacitors are equivalent to circuit breakers

What is grading capacitor in circuit breaker?

Grading capacitor is commonly used in High Voltage Circuit Breaker for uniform voltage distribution across the Breaker contacts at CB open position. In a multi-break Circuit Breaker, Grading capacitors are connected in parallel with every break of the CB. Reasons for using Grading Capacitors in Circuit Breakers.

Why is grading capacitor used in 400 kV circuit breaker?

This means, if a double break circuit breaker with grading capacitor is used in 400 kV system, then voltage across each of the breaker contact will be equally distributed. This means, the voltage across each interrupter unit will be approximately 200 kV. Voltage equalization by using grading capacitor has great advantage.

What is grading capacitor in 765kv circuit breaker?

Grading capacitors are generally used in 400KV and above voltage level circuit breakers. In the 765KV Circuit breaker, always grading capacitors are used. There are 04 nos. of Breaks available in 765KV Circuit Breaker and Grading capacitors are used for the equal voltage distribution to avoid failure of the CB.

What are the advantages of using a grading capacitor?

By using a grading capacitor, the failure of the break can be avoided in that condition due to the uniform distribution of voltage across the breaks. During switching of Reactor or any inductor unit, Restriking voltage will generate across the breaks of Circuit Breaker. Restriking over voltage may lead to failed Circuit Breaker.

How does a circuit breaker discharge a capacitor?

Following the closing of circuit breaker, the capacitors are discharged through the loop closed by the interrupter; the highest discharging current is associated with the initial voltage across the capacitor, along with the damping resistance. The insulating requirement for the capacitor is relatively modest.

How does a capacitor work?

Initial State: When the circuit is first connected to the voltage source, the capacitor acts like a short circuit, allowing a large initial current to flow. Steady State: As the capacitor charges up, the current through it decreases, and eventually, the capacitor acts like an open circuit. At this point, the current flows only through the resistor.