Air Blast Circuit Breaker - Free download as Powerpoint Presentation .ppt /. pptx), PDF File .pdf), Text File .txt) or view presentation slides online. PDF | oil Circuit Breakers, air blast circuit breakers, sf6 circuit breakers, vacuum circuit breakers. Arc Control Oil Circuit Breakers. Low Oil Circuit Breakers. Maintenance of Oil Circuit Breakers. Air-Blast Circuit Breakers. Types of.
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In air break circuit breaker the arc is initiated and extinguish in substantially static air in which the arc moves. Such breakers are used for low voltages, generally. Chapter (3) Types of Circuit Breakers. Air break circuit breaker. • The air at atmospheric pressure is used as an arc extinguishing medium in Air-Break. This article discusses about Air Circuit Breaker (ACB), its working principle, types of Air Break Circuit Breaker InterruptionAir Break Circuit Breaker Interruption.
Air circuit breaker has several advantages over the oil, as an arc quenching medium. These are Elimination of risk and maintenance associated with the use of oil. The absence of mechanical stress that is set up by gas pressure and oil movement. Elimination of the cost of regular oil replacement that arises due to deterioration of oil with the successive breaking operation. In air break circuit breaker high resistance principle is employed.
Sheet Steel Supporting Structure 2. Current Transformer for Protection Trip Unit 3. Pole Group insulating box 4. Horizontal rare terminals 5a. Plates for fixed main contacts 5b.
Plates for fixed arcing Contacts 6a. Plates for Main moving contacts 6b. Plates for Moving Arcing contacts 7. Arcing Chamber 8.
Terminal box for fixed version — Sliding Contacts for withdrawable version 9. Protection Trip Unit Circuit breaker Closing and Opening Control The main aim of circuit breaker is to prevent reestablishment of arcing after current zero where the contact gap will withstand the system recovery voltage.
It does it same work, but in a different manner.
During interruption of arc, it creates an arc voltage instead of supply voltage. Arc voltage is defined as the minimum voltage required for maintaining arc. The circuit breaker increases the voltage in three different ways: Arc voltage can be increased by cooling arc plasma. As soon as the temperature of arc plasma motion of particle in arc plasma is reduced, more voltage gradient will be required to maintain the arc.
By splitting the arc into a number of series will increases the arc voltage. Arc voltage can be increased by lengthening the arc path. As soon length of arc path is increased the resistance path will increase more arc voltage is applied across the arc path hence arc voltage is increased.
It is operated within voltage level up to 1 KV. It contains two pairs of contact. The main pair carries the current and the contact made of copper. An additional pair of contact is made of carbon. When the breaker is opened, the main contact opens first. During opening of the main contact, the arc contact remains in touch with each other.
The arcing gets initiated when arc contacts are separated.
The circuit breaker is obsolete for medium voltage. Types of Air Circuit Breaker There are four types of ACBs used in the control and protection to maintain and stable operation of switch gears and indoor medium voltage. Plain air circuit breaker or Cross-Blast Air Circuit Breaker: The circuit breaker is fitted with a chamber surrounding the contact. The arc chute is divided into a number of small compartments by using metallic separation plates. Metallic separation plates are arc splitters and each of small compartments behave as a mini arc chute.
Initial arc will split into a series of arcs this will make all arc voltages higher than system voltage. They are preferable choice in low voltage application.
The main contacts are made of copper and the silver plates having low resistance and conducts the current in closed position. Auxiliary or arcing contacts are made of copper alloy as they are heat resistance and used to prevent from damaging the main contacts due to arcing and can be easily replaced when needed in case of wear and tear.
During the circuit breaker operation, the arcing or auxiliary contacts are closed before and open after the main contacts of the circuit breaker. Magnetic blowout air circuit breakers provide magnetic control over the arc moment to make arc extinction within the devices. The arc extinction is controlled using magnetic field provided by the current in blowout coils connected in series with the circuit being interrupted. Magnetic field does not control and extinguish the arc made in the breaker, but it moves the arc into chutes where the arc is lengthened, cooled and extinguished accordingly.
These kind of circuit breakers are used up to 11kV. This type of circuit breaker is used for system voltage of KV, KV and even more. Related post: Related Articles: Please Subscribe. Enter your Email in the above right sidebar corner. So that, we will send you each post in your mailbox. Sr me iti kr rha hu electricia se.
Sr kya apne hindi bhasha me bhi notes teyar kiy h? Sir, Thanks for such clear and perfect practically notes.
Dear Sir, Thanks for the perfect and practical notes. Very educative. Your email address will not be published. Air blast circuit breaker has further divided into three categories: Axial blast breaker Axial blast with sliding moving contact.
Related Posts: Axial blast breaker. The moving contact is in contact. There is a nozzle orifice in fixed contact at normal closed condition of breaker. When a fault occur high pressure is introduced into the chamber. High-pressure air will flow through nozzle orifice voltage is sufficient to sustain. Axial blast with sliding moving contact.
The moving contact is fitted over a piston supported by a spring. The blast transfers arc to arcing electrode. Show More. Related Articles.