The ZW68-12 intelligent complete set of pole-mounted circuit breaker is a new generation of integrated intelligent automatic vacuum circuit breaker. Suitable for protection and control in power distribution systems of substations and industrial and mining enterprises, and more suitable for rural power grids and frequently operated places. It's a second-time fusion product: Deep integration of isol...

1. Electrical Structure (see Figure 1) Figure 1 Schematic diagram of solid-sealed pole structure The electrical main circuit part of VB5 (ZN21B) adopts advanced epoxy resin casting technology, and the vacuum interrupter is directly sealed in epoxy resin, and there is a silicone rubber buffer layer between the two, which becomes a casting type circuit breaker pole. column. This process makes the co...

1．Main bus installation The main busbar use rectangular busbar in switchgear. In consideration of the convenience of installing the main bus, the main bus is segmented made according to the width and length of the cabinet. The basic steps of main bus installation are as follows: 1）After inspecting the busbar bushing without damage, install busbar bushing and supporting busbar bushing board 2）Wipe ...

Switchgear shell, baffle and pressure relief device The shell and baffle of the switchgear are assembled by high-strength bolts (or rivets) after being processed and bent by CNC machine tools with anti-oxidation and anti-corrosion aluminum-zinc plates. Therefore, the assembled switchgear can ensure the uniformity on the size and high mechanical strength. The door surface paint of switchgear adopts...

1. Circuit breaker handcar enters the cabinet: Inspect the condition of the circuit breaker carefully，check whether it is in good condition before circuit breaker handcar enter into the cabinet. Whether the circuit breaker is in the opening state, otherwise, must opening first. Whether tools and other sundries are omitted in the handcar, after confirming good, push the handcar into the cabinet and...

When you want to buy switchgears, you should know some basic knowledge for "What? How? Why?" (part 1) 1．Why is switchgear called "complete set"? What kinds of cabinet does it compose of? Switchgear is composed of incoming line, metering, PT, outgoing line, etc. Primary and secondary Components are installed inside the cabinet, when buying, must form a complete set, so we call "complete set". 2. Wh...

When you want to buy switchgears, you should know some basic knowledge for "What? How? Why?" (part 3) 27、What kinds of circuit breakers are there? 1) Vacuum circuit breaker: Use vacuum as arc extinguishing medium and main insulating medium. The dynamic and static contacts of arc extinguishing are sealed in vacuum arc extinguishing room. There are mainly 10VK and 35KV voltage classes. 2) SF6 circui...

Analyze the reasons for the failure of the high and low voltage switchgear, mostly in the insulation, conductivity and mechanical aspects. 1. Insulation failure: Insulation level is to correctly handle the relationship between various voltages (including operating voltage and various overvoltages) acting on the insulation, various voltage limiting measures, and insulation strength. Strive to make ...