Vacuum circuit breaker
What is a vacuum circuit breaker? The "vacuum circuit breaker" is named because its arc extinguishing medium and the insulation medium of the contact gap after arc extinguishing are both high vacuum; It has the advantages of small size, light weight, suitable for frequent operation, arc extinguishing without maintenance, and is widely used in distribution networks. The vacuum circuit breaker is an indoor power distribution device in a 3~10kV, 50Hz three-phase AC system, which can be used for the protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations. It is especially suitable for use in places requiring no oiling, less maintenance, and frequent operation. The circuit breaker can be configured in the central cabinet, double layer cabinet, and fixed cabinet as the control and protection of high-voltage electrical equipment. Operating principle of vacuum circuit breaker: when the moving and static contacts are opened under the action of the operating mechanism, an arc is generated between the contacts, and the contact surface volatilizes steam under high temperature. Because the contact is designed to be of a special shape, a magnetic field is generated when the current passes through. Under the action of this magnetic field, the arc moves rapidly along the tangent direction of the contact surface, and the metal cylinder (shield) Some metal vapor condenses on the contact, the arc goes out when it naturally passes zero, and the strength of the medium between the contacts quickly recovers. Structural composition of vacuum circuit breaker: airtight insulation system (shell), conductive system, shielding system, operating mechanism, base, insulation support, insulator, etc.