What is air blast circuit breaker?
An Air Circuit Breaker (also known as an Air Blast Circuit Breaker or ACB) is an automatically operated electrical switch that uses air to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its primary function is to interrupt current flow after a fault is detected.
What is air breaker PDF?
Air Circuit Breaker (ACB) is electronic equipment that is used for the protection of electric circuits from short circuits or overcurrent. The ACB operates at atmospheric pressure in air. ACB is used in the switching mechanism and protection of the electrical system.
What is the difference between air circuit breaker and air blast circuit breaker?
Air break CB is a simple CB which operates in open air with No extra equipments or systems attached to it. Air break CB is a simple CB which operates in open air with No extra equipments or systems attached to it. On the other hand, Air blast circuit breaker uses compressed air or gas as the arc interrupting medium.
What are the types of air blast circuit breaker?
Types of Air Blast Circuit Breakers
- Axial Blast Type – air blast is directed along the arc path.
- Cross Blast Type – air blast is directed at right angles to the arc path.
- Radial Blast Type – air blast is directed radially. Types of Air Blast Circuit Breaker.
What is the breaking capacity of air blast circuit breaker?
The air blast circuit breaker is the type of circuit breaker where high pressure (at a pressure of 30 kg/cm2) air-blast is used for arc extinction. So they seek applications in the high voltage (132 kV and above) transmission system and interconnected networks with breaking capacity up to 7500 MVA.
Where are air blast circuit breakers used?
Air blast circuit breakers are used in arc furnace duty, traction systems, and used for the railway electrification because they are suitable for repeated duty.
How many types of air circuit breakers are there?
These circuit breakers are used in places with a high possibility of fire or explosion hazards in most cases. There are three different types of air circuit breakers. These are the basic break type of air circuit breaker, magnetic blowout type of air circuit breaker and the air chute circuit breaker.
What is VCB?
VCB stands for Vacuum Circuit Breaker. In vacuum circuit breakers, the vacuum is used as the arc quenching medium. Vacuum offers the highest insulating strength. For higher voltage vacuum technology has been developed but not commercially viable.
How many coils does an air circuit breaker have?
Most modern circuit breakers are specified with two trip coils. Energizing either one trips the breaker.
Are used in air blast circuit breaker should be?
Air blast circuit breaker used compressed air or gas as the arc interrupting medium. Though gasses such as carbon dioxide, nitrogen, freon or hydrogen are used as the arc interrupting medium, compressed air is the accepted circuit breaking medium for gas blast circuit breakers.
What is the working principle of VCB?
The working principle of the Vacuum Circuit Breaker is that once the circuit breaker is opened inside the contact vacuum, an arc can be generated between the contacts by ionization of the metal vapor in the contact. But the arc can be easily extinguished.
Which gas is used in air circuit breaker?
Sulfur hexafluoride is generally used in present high-voltage circuit breakers at rated voltage higher than 52 kV. Into the 1980s, the pressure necessary to blast the arc was generated mostly by gas heating using arc energy.
What is an air blast circuit breaker?
CONSTRUCTION In air blast circuit breaker (also called 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.
What is the principle of Arc extinction in circuit breaker?
Principle of Arc Extinction in Circuit Breaker. When opening air is required, compressed air is admitted to the arc extinction chamber. It pushes away the moving contacts. In doing so, the contacts are pulled apart, and the air blast moves away the ionized gas along with it and assists arc extinction.
What type of gas is used in circuit breakers?
Though gasses such as carbon dioxide, nitrogen, freon or hydrogen are used as the arc interrupting medium, compressed air is the accepted circuit breaking medium for gas blast circuit breakers.
What is the function of the air circuit breaker?
The air circuit breaker does the same but in different manner. For interrupting arc it creates an arc voltage in excess of the supply voltage. Arc voltage is defined as the minimum voltage required maintaining the arc. This circuit breaker increases the arc voltage by mainly three different ways,