Electric arc erosion resisting switch

Abstract

The invention relates to the field of switches, in particular to an electric arc rotation resisting switch. The electric arc erosion resisting switch comprises a first contact portion and a second contact portion. The first contact portion and the second contact portion are in sliding contact with each other. One end of the first contact portion is provided with a first alloy contact. One end of the second contact portion is provided with a second alloy contact. When the first contact portion is not in contact with the second contact portion, the first alloy contact is opposite to the second alloy contact. When the first contact portion is in contact with the second contact portion, the first alloy contact and the second alloy contact are arranged with the back towards each other. According to the electric arc rotation resisting switch, the two contact portions of the switch are provided with the alloy contacts respectively, after the two contact portions are in contact with each other and then separated, because the resistance of the alloy contacts is large, the discharging effect of the contact portions is lowered, and the probability of an arc discharging phenomenon is reduced; because the alloy contacts are resistant to erosion, the erosion, caused by an electric arc, of the contacts is reduced, the surfaces of the two contact portions of the on-load switch are protected, the stability of contact is guaranteed, and the service life of the switch is prolonged.

Description

technical field [0001] The invention relates to the field of switches, in particular to an arc ablation resistant switch. Background technique [0002] The switch often needs to break a large current, so its contact is easy to be ablated gradually from the separation point, and finally the contact surface is gradually reduced due to severe ablation of the contact, and it is burned due to heat. The present invention takes a transformer on-load switch as an example. The transformer on-load tap changer is a switching device that provides a constant voltage for the transformer when the load changes. The basic principle is to switch between taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and finally realizing the purpose of voltage regulation. Transformer on-load capacity regulation switch is a switch device through which the transformer can change its own c...

AI Technical Summary

Problems solved by technology

[0004] In the process of opening and closing the on-load switch used in the prior art, an arc will be generated at the two ends of the on-load switch at a certain distance, that is, an arcing phenomenon will occur, and then it will be affected by the high voltage and high current of the arc. The on-load switch is destroyed, causing more spots on the contact surface of the on-load switch, resulting in poor contact of the on-load switch, which greatly affects the service life of the on-load switch

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