& Vacuum interrupter product introduction: Vacuum interrupter, also known as vacuum switch tube, is the core component of medium and high voltage power switches. Its main function is to quickly extinguish the medium and high voltage circuit after cutting off the power through the excellent insulation of the vacuum in the tube. Arc and suppress current to avoid accidents and accidents. It is mainly used in power transmission and distribution control systems, and is also used in power distribution systems such as metallurgy, mining, petroleum, chemical industry, railways, broadcasting, communications, and industrial high-frequency heating. It has the characteristics of energy saving, material saving, fire prevention, explosion proof, small size, long life, low maintenance cost, reliable operation and no pollution. Vacuum arc extinguishing chambers are divided into arc extinguishing chambers for circuit breakers and arc extinguishing chambers for load switches. The arc extinguishing chambers for circuit breakers are mainly used in substations and power grid facilities in the power sector, and the arc extinguishing chambers for load switches are mainly used in power grids. end users.
Vacuum interrupter product classification:
According to shell:
Glass vacuum interrupter, ceramic vacuum interrupter.
According to application:
Vacuum arc interrupter for circuit breaker, vacuum arc interrupter for load switch, vacuum arc interrupter for contactor, vacuum arc interrupter for recloser, vacuum arc interrupter for segmenter and others Special purpose vacuum interrupter.
Working principle of vacuum interrupter:
The vacuum interrupter inside the vacuum bubble uses high vacuum working insulating arc extinguishing medium, and relies on a pair of contacts sealed in the vacuum to realize the on and off of the power circuit. Functional electric vacuum device. When it disconnects a certain amount of current, at the moment when the moving and static contacts are separated, the current shrinks to the point where the contacts have just separated, and the resistance between the electrodes increases sharply and the temperature rises rapidly until the evaporation of the electrode metal occurs, and at the same time a pole is formed. The high electric field intensity leads to extremely strong emission and gap breakdown, resulting in a vacuum arc. When the power frequency current approaches zero, the contact opening distance also increases. The plasma of the vacuum arc quickly spreads to the surroundings, and the arc current After zero crossing, the medium in the contact gap quickly changes from a conductor to an insulator, so the current is interrupted. Due to the special structure of the contact, an appropriate longitudinal magnetic field will be generated in the contact gap during arcing. This magnetic field can evenly distribute the arc on the surface of the contact and maintain a low arc voltage, thereby making the vacuum arc extinguishing chamber have a high back-arc medium. Strength recovery speed, small arc energy and small corrosion rate. In this way, the ability and service life of the vacuum interrupter to break current are improved.
2016 new independently developed fully insulated vacuum arc extinguisher\vacuum switch tube