Views: 0 Author: Site Editor Publish Time: 2022-01-18 Origin: Site
"Vacuum circuit breaker" is called because its arc extinguishing medium and the contact line insulation medium after arc extinction are both high vacuum; It has the advantages of low size, low weight, suitable for frequent operation and maintenance-free arc removal. The use in the power grid is more popular. Here we present the vacuum circuit breaker in the following words, let us see it.
What are the specifications of vacuum circuit breakers?
What is included in the structure of a vacuum circuit breaker?
What is the function of the main shielding cover of the vacuum circuit breaker?
vacuum circuit breakers can usually be divided into several voltage levels. The low voltage type is generally used for explosion-proof electrical applications. Like coal mines and so on.
The rated current reaches 5000A, the cut-off current reaches good 50kA and has developed to a voltage of 35kV.
Before the 1980s, the vacuum circuit breaker was in the early stages of development. The technology was constantly being researched and technical standards could not be formulated. Only 1985 the corresponding product standards were established.
Air-tight insulation system (housing)
The airtight insulation system consisting of airtight insulation cylinder made of ceramics, glass or glass ceramics, movable end cover, solid end cover and stainless steel bar is a vacuum air-tight container. In order to ensure air density, in addition to strict operating techniques for the type of sealing, the material itself must have air permeability and low internal exhaust.
It consists of a fixed conductive rod, a fixed arc surface, a fixed contact, a movable contact, a movable arc surface and a movable conductive rod. There are roughly three types of contact structures: cylindrical contact, transverse magnetic field contact with spiral curve surface and longitudinal magnetic field contact. This type of vacuum circuit breaker is currently using longitudinal magnetic field technology and has a strong and stable light arc switching capability.
The shield cap is an indispensable part of the vacuum circuit breaker, and there are many types such as the main shield cap around the contacts, the shield cap and the shield cap for the voltage balance.
The function of the main shield is:
A. Prevent the arc product from spraying on the inner wall of the insulating casing during the arc process, thereby reducing the insulation strength of the casing.
B. Improve the uniformity of the electric field distribution within the arc-extinguishing chamber, reducing the local field strength and promoting the miniaturisation of the vacuum switch tube.
C. Condenses the arc product, absorbs part of the arc energy and helps restore the strength of the crack after the arc.
Zhejiang Zhegui Electric Co., Ltd strives to offer high quality vacuum circuit breaker at reasonable prices, efficient production times and the most professional customer service.