Vacuum Circuit Breaker

"Vacuum breaker" because of the media and arc interrupter contact gap after high vacuum insulating medium are named; their small size, light weight, suitable for frequent operation, no maintenance interrupter advantages in distribution grid applications more popular. Vacuum circuit breaker is 3 ~ 10kV, 50Hz three-phase AC power distribution system in the indoor unit for industrial and mining enterprises, power plants, substations and electrical equipment as protection and control purposes, especially for applications that require non-oil and less maintenance and use of premises frequent operation, the circuit breaker can be configured in the center cabinet, double cabinet, fixed cabinet as the control and protection of high-voltage electrical equipment.
Overview Introduction

"High-voltage vacuum circuit breaker" because of the media and arc interrupter contact gap after high vacuum insulating medium are named;
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Its small size, light weight, suitable for frequent operation, maintenance arc without the advantages of the application in the distribution network is more popular. A brief history of 1893, the United States proposed structure Rittenhouse simple vacuum interrupter, and obtained design patents. 1920 Sweden Buddhism Canadian company made the first vacuum switch. 1926 U.S. Sorensen and other published research also shows current in a vacuum carve off the possibility, but the breaking capacity is small, but also by the development of vacuum technology and vacuum material level of restrictions, still can not put into practical use. With the development of vacuum technology, 50 years before the United States made the first cut off the capacitor bank for special requirements such as vacuum switch, breaking current kA still stopped at four levels. As advances in technology vacuum smelting materials and structure of the vacuum switch contacts on the breakthrough in 1961, the U.S. General Electric Company began producing 15 kV, breaking current of 12.5 kA vacuum circuit breakers  1966 trial made 15 kV, 26 kA 31.5 kA vacuum circuit breaker, so that the vacuum breaker into a high-voltage, large-capacity electrical system. Mid-1980s, a vacuum circuit breaker breaking capacity has reached 100 kA. China started to develop from 1958 vacuum switch, 1960, Xi'an Jiaotong University and Xi'an switch rectifier plant jointly developed into the first batch of 6.7 kV, breaking capacity of 600 amp vacuum switch; subsequently made 10 kV, breaking capacity of 1.5 kA three-phase vacuum switch. 1969 Love photoelectron Pipe Factory and Xi'an High Voltage Apparatus Research Institute made a 10 kV, 2 kA fast single-phase vacuum switch. After 70 years, China has been able to independently develop and produce all kinds of vacuum switch.
Vacuum air circuit breaker is usually divided into a plurality of voltage levels. Low pressure type generally used for explosion-proof electrical use. Like coal and so on.
Feature

① contact opening distance of small, 10KV vacuum circuit breaker contact opening distance is only about 10mm, the operating mechanism of the operating power is small, the mechanical part of the stroke is small, and its mechanical life is long.
② arcing time is short, and has nothing to do with the size of the switch current, generally only half cycle.
③ After the contact gap arc media recovery speed, off-off line fault better performance.
④ Because dredge in breaking current amount of wear is small, so the electrical contacts, long life, full capacity breaking up 30-50 times the rated current breaking up to 5,000 times more noise for frequent operation.
⑤ small size and light weight.
⑥ For breaking capacitive load current.
Due to its many advantages, it is widely used in substations, the current models are: ZN12-10 type, ZN28A-10 type, ZN65A-12 type, ZN12A-12 type, VS1 type, ZN30 type.
Works
Vacuum circuit breaker works: When dynamic and static contact under the action of the operating mechanism sub-gate, the contact between the arcing contact surface evaporate out of steam at a high temperature, due to the special shape of the contact design, in the current When generating a magnetic field through the arc in this magnetic field along the contact surface tangentially rapid movement in the metal cylinder (shield) metal vapor condenses on the part of the arc in the natural zero crossing went out, contact between the dielectric strength and quickly recover.