Arc Extinction In Circuit Breaker

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.

Arc extinction in circuit breaker.

Principle of arc extinction. In circuit breaker with plain break arc in oil arc in chutes or narrow slots nearly all the heat loss due to conduction. Hence the current is. There are two methods of extinguishing the arc in circuit breakers.

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

Therefore while designing the circuit breaker provision of mechanical strength to withstand such sudden release of large quantities of energy must be made. Principle of arc extinction in circuit breaker. The arcing resistance increases with decrease in the cross sectional area of the arc. Cross section of the arc.

It pushes away the moving contacts. 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. 1 high resistance method. There are two methods of extinguishing the arc in circuit breaker.

The air blast needs an additional compressed air system which supplies air to the air receiver. When opening air is required compressed air is admitted to the arc extinction chamber. Method of arc extinction. Principles and methods of arc extinction are discussed here.

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. Methods of arc extinction in circuit breaker. This arc is dangerous on account of the energy generated in it in the form of heat which may result in explosive force. The arc resistance increases as the length of arc increases i e.