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Insulation of vacuum interrupter


Vacuum circuit breaker insulation is divided into fracture insulation, interphase insulation and insulation to the ground. vacuum interrupter in the vacuum circuit breaker in addition to breaking the working current and short circuit current, but also bear the task of fracture isolation. At present, the manufacturer of interrupter is good and bad, in order to ensure the vacuum circuit breaker in the safe and reliable operation of the power system, vacuum interrupter as the core of the vacuum circuit breaker device to ensure its insulation capacity, select the quality assurance manufacturers is essential The
Vauum interrupter contactor insulation is divided into internal insulation and external insulation, the internal insulation is divided into static insulation and dynamic insulation. In the type test, the insulation of the vacuum interrupter mainly assess the short-time power frequency withstand voltage and lightning impulse withstand voltage, and in actual use, due to grid conditions and the use of different environments, vacuum interrupter insulation needs Consider the factors, such as breaking the small inductor current cut off the over-voltage, open the fault load when the heavy blow through the voltage and in the high temperature, hot and humid, dirty, high altitude and other harsh conditions of insulation tolerance ability. In view of the above factors, the insulation of the vacuum interrupter mainly from the insulation design, manufacturing process and the use of three ways to consider. Insulation design and manufacturing process is done by the manufacturer of the vacuum interrupter, while the use of the need for more vacuum circuit breaker manufacturers to consider.

Vacuum interrupter in the design and manufacture of the insulation after the completion of the guarantee, does not mean that can be used under any conditions, empty interrupter in the practical application of the insulation problem is limited by the use of conditions, circuit breaker manufacturing Manufacturers must be based on the use of end-users place to make a different design to meet the insulation needs.
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The process of vacuum interrupter production

The exhaust platform process refers to the vacuum interrupter parts through brazing and argon arc welding process to be made into the exhaust pipe, and then connected to the exhaust platform for vacuum and baking degassing, and finally cold folder The process of sealing. This process, the process is complex, long route, generally have 9 processes. So the efficiency is low and the Vauum interrupter contactor parts of the pollution links. Moreover, according to this process to produce vacuum interrupter baking temperature is low (450 ℃ or so), and thus degassing is not complete. A row of packaging technology Refers to the vacuum interrupter parts of the first brazing into several parts, and then several parts assembled into the vacuum interrupter the whole, and then in the vacuum furnace to complete the exhaust, bake to the gas and brazing sealing process. This process, the process is relatively simple, there are generally 7 processes, and thus more efficient and less polluting man. ...
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What is the role of the glass enclosure of the vacuum interrupter?

Arc is actually the shape of the current in the air, in the final analysis, or the current, the conductivity of the metal is good, of course, can attract current, so the arc ran to the metal grid, the arc energy, of course, can burn metal grating, so the energy of the arc Not on the consumption of it, like Dayu flood control, not to be out is not possible, the key is to ease the arc burning bar that it will not burn the contact, so only for the arc chamber breaker Can be reused. Part of the main screen shield and bellows shield, generally use oxygen-free copper or stainless steel main effect: 1) to prevent the contact in the arcing process to produce a large number of metal vapor and droplet splashing, pollution of the inner wall of the insulating shell, to avoid causing the vacuum interrupter shell insulation strength decreased or flashover. Bellows shield is mainly to protect the bellows from the corrosion of metal vapor and lead to leakage, and now some of the desi...
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Pressure measurement of the vacuum interrupter

Pressure measurement is an important one in the vacuum interrupter parameter test. The pressure in the arc chamber is the basis for the formation of air blowing, but too high pressure will cause excessive requirements for the strength of the arc chamber housing. Therefore, the arc valve optimization design of an important goal is: to improve the breaking performance at the same time, as much as possible to reduce the pressure inside the interrupter. The main contents of the design of the low-voltage circuit breaker interrupter include: the shape and size of the outlet; the shape and arrangement of the grille; the structure of the exhaust channel; the size and structure of the arc chamber; the choice of gas-generating material. In the arc chamber to place gas production materials, on the one hand the use of gas to improve the pressure of the Vacuum interrupter for load break switch to promote air blowing; the other hand, the use of gas, such as hydrogen and other components con...
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