Arc Extinction In Circuit Breaker

These are high resistance methods and low resistance or zero resistance method.

Arc extinction in circuit breaker.

Cross section of the arc. 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. Therefore while designing the circuit breaker provision of mechanical strength to withstand such sudden release of large quantities of energy must be made. When opening air is required compressed air is admitted to the arc extinction chamber.

In circuit breaker with plain break arc in oil arc in chutes or narrow slots nearly all the heat loss due to conduction. The arc resistance increases as the length of arc increases i e. Principle of arc extinction in circuit breaker. It pushes away the moving contacts.

Heat loss from an arc in circuit breaker is takes place through conduction convection as well as radiation. 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. 1 high resistance method. 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.

Arc extinction when the current carrying contacts of the circuit breaker are moved apart an arc is formed which insist for a short period after the separation of contacts. 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. Hence the current is. Methods of arc extinction in circuit breaker.

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. There are two methods of extinguishing the arc in circuit breakers. There are two methods of extinguishing the arc in circuit breaker. Principles and methods of arc extinction are discussed here.

Principle of arc extinction. Method of arc extinction. As the separation between the contacts of breaker increases the arcing resistance also increases. In doing so the contacts are pulled apart and the air blast moves away the.