why an isolator is used in series with air blast circuit breaker
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Air blast industrial circuit breaker are used today from 11 to 1100 KV for a range of applications. They offer several advantages: faster operations, suitability for related operation, auto-reclosure, unit type multi-break construction, simple assembly, and modest maintenance. A compressor plant is necessary to maintain high air pressure in the receiver. Air blast industrial circuit breakers are used for interconnected lines as well as lines in which rapid operation is desired.
Construction of the Air Blast Industrial circuit breaker
In the air blast industrial circuit breaker (also called a compressed air circuit breaker), high pressure air is forced on the arc through a nozzle at the instant of contact separation. The ionized medium between the contacts is blown away by the blast of the air. After the arc extinction, the chamber is filled with high pressure air, which prevents re-strike. In some low capacity industrial circuit breakers, the isolator is an integral part of the industrial circuit breaker. The industrial circuit breaker opens and immediately after that the isolator opens, to provide an additional gap.
Two Types of Air Blast Industrial Circuit Breakers
Air blast industrial circuit breakers are classified according to the type of air blast around the contacts for arc extinction. They are: 1) Axial-blast air industrial circuit breakers and 2) Cross blast air industrial circuit breakers.
Axial-blast Industrial Circuit Breaker: This type of an industrial circuit breaker consists of fixed and moving contacts that are held in closed position by spring pressure under normal conditions. The air reservoir is connected to the arcing chamber through an air valve. This valve remains closed under normal conditions but opens automatically by tripping impulse when a fault occurs in the system.
Construction of the Air Blast Industrial circuit breaker
In the air blast industrial circuit breaker (also called a compressed air circuit breaker), high pressure air is forced on the arc through a nozzle at the instant of contact separation. The ionized medium between the contacts is blown away by the blast of the air. After the arc extinction, the chamber is filled with high pressure air, which prevents re-strike. In some low capacity industrial circuit breakers, the isolator is an integral part of the industrial circuit breaker. The industrial circuit breaker opens and immediately after that the isolator opens, to provide an additional gap.
Two Types of Air Blast Industrial Circuit Breakers
Air blast industrial circuit breakers are classified according to the type of air blast around the contacts for arc extinction. They are: 1) Axial-blast air industrial circuit breakers and 2) Cross blast air industrial circuit breakers.
Axial-blast Industrial Circuit Breaker: This type of an industrial circuit breaker consists of fixed and moving contacts that are held in closed position by spring pressure under normal conditions. The air reservoir is connected to the arcing chamber through an air valve. This valve remains closed under normal conditions but opens automatically by tripping impulse when a fault occurs in the system.
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