Arc-resistance piece structure and vacuum switch contact

Abstract

Structure of arc-resistant piece includes an arc-resistant piece with high breaking capacity. Being in use for cutting off electric arc generated when vacuum switch is turned to off, at least one part with small diversion closure value is embedded on upper surface of the arc-resistant piece. The invention also is related to a vacuum switch contactor includes body case, conductive part, conductive bottom, magnetic generation assembly, and the said structure of arc-resistant piece. Perforated notch is setup inside the magnetic generation assembly from up to down. Being inserted to the notch, conductive part with two ends contacts to the conductive bottom and structure of arc-resistant piece respectively. Conductivity of the magnetic generation assembly is lower than conductivities of other parts. Melting point of the body case is higher than melting points of other parts. Features are: high capability of anti fusion welding, high breaking capacity, and low diversion closure value.

Description

technical field [0001] The invention relates to an arc-resistant structure and a vacuum switch contact, in particular to an arc-resistant structure and a vacuum switch contact for a high-voltage vacuum switch. Background technique [0002] Switching equipment is a kind of equipment that must be applied in the circuit, and it plays the role of closing and breaking the circuit. During the breaking process of the switch contact, an arc will be generated, and the plasma arc with the arc column as the cone surface will be generated from the cathode spot combustion. Especially in high-voltage circuits, the arc generated by the switch is particularly strong. [0003] The arc will increase the temperature of the switch and wear the switch, and the existence of the arc will reduce the current breaking capacity of the contacts. Therefore, the arc must be extinguished during the switching process of the switch contact. Most of the current switchgear uses such as oil, sulfur hexafluo...

AI Technical Summary

Problems solved by technology

[0005] However, the arc cannot be completely eliminated, so the existing high-voltage switches all have arc-resistant parts on the switch contacts.

The arc-resistant parts of vacuum switch contacts in the prior art use metals such as copper or chromium, or use copper-chromium alloys. Due to the small resistance of copper, the resistance to pressure is strong but the anti-welding ability is poor, while the anti-welding ability of chromium is strong but The resistance is large and the withstand voltage is poor. Therefore, although it is hoped to achieve strong anti-welding ability, strong breaking capacity and small current cut-off value at the same time, this has become a contradiction and cannot be achieved at the same time.

One of the requirements of breaking capacity, withstand voltage capacity and current interception value can only be achieved by choosing different ratios of copper and chromium, but it will inevitably sacrifice other capabilities and cannot be achieved at the same time

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