Vacuum contactor

Abstract

The invention discloses a vacuum contactor which comprises an electric insulation frame, a metal base, a transmission connecting lever, an electromagnetic system, an auxiliary switch and a vacuum switch tube. The metal base is fixed to the bottom face of the electric insulation frame. The transmission connecting lever, the electromagnetic system, the auxiliary switch and the vacuum switch tube are arranged in the electric insulation frame. The vacuum switch tube is connected with the electromagnetic system through the transmission connecting lever, and is also connected with the auxiliary switch. The vacuum contactor further comprises a discrete cavity, wherein the discrete cavity is located in the side face of the electric insulation frame and can move relative to the electric insulation frame. By means of the structure, the situation that high maintenance cost and a complex maintenance process are needed when the service life of an electrolytic capacitor is due is avoided, and the maintenance cost of the electrolytic capacitor of the vacuum contactor is very low; the electrolytic capacitor can be removed out of the vacuum contactor through easy operations, and then the vacuum contactor can be replaced.

Description

technical field [0001] The invention belongs to the field of vacuum contactors, in particular to a vacuum contactor suitable for the field of flexible DC transmission. Background technique [0002] With the development of the national economy and the continuous improvement of people's material and cultural living standards, people's demand for electricity is increasing, and new and higher requirements are put forward for the reliability and safety of power supply. According to statistics, more than 80% of the electric energy in the power system is distributed and used by electrical appliances. Vacuum contactor is an indispensable electrical product with a large quantity and a wide range in electric drive and automatic control systems. It is used to frequently connect and disconnect AC and DC main circuits and large-capacity control circuits, and can realize remote control. In the design of a vacuum contactor, the design of the control circuit is always one of the difficulti...

AI Technical Summary

Problems solved by technology

However, the life of energy storage capacitors is currently a bottleneck affecting the development of vacuum contactors. Most of the energy storage capacitors used in control circuits now use electrolytic capacitors. The electrolyte of electrolytic capacitors will deteriorate over time, thus making the insulation of electrolytic capacitors The resistance decreases, the leakage current increases, and the life of the capacitor is shortened

[0004] Existing vacuum contactors encapsulate electrolytic capacitors inside the structure, which cannot be replaced by simple plugging and unplugging. When the life of the electrolytic capacitors expires and cannot provide the energy required for opening and closing of the vacuum contactors, the vacuum contactors will fail

At this time, special technicians are required to repair the vacuum contactor and replace the electrolytic capacitor. The maintenance cost is high, and the process is very cumbersome. The structure of the vacuum contactor needs to be improved.

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