What is current chopping in a circuit breaker?

Current chopping in circuit breaker is defined as a phenomenon in which current is forcibly interrupted before the natural current zero. Current Chopping is mainly observed in vacuum circuit breaker and air blast circuit breaker. There is no such phenomena in oil circuit breaker.

Why there is no current chopping in oil circuit breaker?

Current chopping is not common in oil circuit breakers because in most of the oil circuit breakers the arc extinguishing power is proportional to the magnitude of current to be interrupted.

What are the limitations of circuit breaker?

Disadvantages of Circuit Breaker Disadvantages include: Installation and repair is expensive as compared to fuse. Fuse reacts faster compared to C/B.

Is current chopping good or bad?

If the chop occurs at a current i the stored energy in the inductance is 1/2 Li2 which will discharge into the stray capacitance; equating these energies gives a voltage across the breaker of e = i√L/C which may reach dangerous values.

What is current chopping also explain how the effect of current chopping can be Minimised?

Again, if this voltage V is high enough, then it may lead to the restrike of arc in the breaker and thus current again start to flow through the circuit. In each current chopping the magnitude of current reduces. This is because of dampening effect of losses in the equipment like eddy current loss and hysteresis loss.

How the effect of current chopping can be minimized?

Current chopping produces high voltage oscillations which can be prevented by this method. During arc interruption CB contacts separate first and after arc gets extinguished ‘S’ opens depending upon the time delay provided to it. When the fault occurs the CB contacts open and arc is struck between them.

Which part of the circuit breaker is helpful in breaking the current *?

Q. Which part of the circuit breaker is helpful in breaking the current? a. Trip coil.

What are advantages of circuit breaker?

Circuit-breakers respond quicker than fuses. Circuit-breakers are more reliable. Circuit-breakers are more sensitive. Unlike fuses which only operate once and need to be replaced a circuit-breaker can be reset.

Which of the following is a disadvantage of a series circuit?

A disadvantage of series circuits is that if there is a break or fault at any of the appliances connected to the circuit, the remaining appliances will be cut from the supply. Regarding parallel circuits, appliances can be connected and disconnected to the circuit without affecting other parts of it.

What will happen when the current in the circuit exceeds the wire current rating that causes the wire to heat up?

Exceeding the rated load for the circuit wiring causes the circuit breaker to trip, shutting off the power to the entire circuit. If there were no breaker in the circuit, an overload would cause the circuit wiring to overheat, which could melt the wire insulation and lead to a fire.