Arc Extinction In Circuit Breaker

When opening air is required compressed air is admitted to the arc extinction chamber.

Arc extinction in circuit breaker.

The arc resistance increases as the length of arc increases i e. In air blast circuit breaker or in breaker where a gas flow is present between the electrical contacts the heat loss of arc plasma occurs due to convection process. This is the main drawback of this method of arc extinction and so its use is restricted to dc circuit breakers and air break type ac circuit breakers of relatively low capacities of the. The air blast needs an additional compressed air system which supplies air to the air receiver.

Cross section of the arc. 1 high resistance method. Principles and methods of arc extinction are discussed here. Method of arc extinction.

In high resistance method the arc resistance is made to increase gradually with the time so that the current force in between the two contacts is insufficient to maintain the arc. In this method the arc resistance is increases gradually so that current is reduced to such a value that heat is insufficient to maintain the arc. It pushes away the moving contacts. In doing so the contacts are pulled apart and the air blast moves away the.

The arcing resistance increases with decrease in the cross sectional area of the arc. In circuit breaker with plain break arc in oil arc in chutes or narrow slots nearly all the heat loss due to conduction. Principle of arc extinction in circuit breaker. These are high resistance methods and low resistance or zero resistance method.

This arc is dangerous on account of the energy generated in it in the form of heat which may result in explosive force. Methods of arc extinction in circuit breaker. There are two methods of extinguishing the arc in circuit breakers. As the separation between the contacts of breaker increases the arcing resistance also increases.

Hence the current is. Principle of arc extinction. Heat loss from an arc in circuit breaker is takes place through conduction convection as well as radiation. The main designing criteria of a circuit breaker is to provide appropriate technology of arc quenching in circuit breaker to fulfill quick and safe current interruption.