SU517065A1 - Contact Vacuum Circuit Breaker System - Google Patents

Description

I

This invention relates to the field of vacuum circuit breakers.

In vacuum switches, the contact system consists of contacting and arcing parts. The material of the contacting part has a low weldability and a small current of the sruze, and the material is short and capable of cutting off large

currents and withstand a high arc. In this case, for normal operation of the contact system with a sufficient amount of current, the arc must move from the contacting part to the arcing. Under "the motion of the arc depends on the magnetic field created in the gap and on the ground of the contacts where the arc moves.

Known as a material of contact parts is an alloy of copper, bismuth and boron, which has weak weldability. Also known are arc-resistant metal-ceramic composites that satisfy the requirements of materials for arc-suppressing parts.

The purpose of the invention is to increase the switch off the ability of the switch due to

boron materials for the entire contact system as a whole.

A vacuum breaker contact system is proposed in which the material for each part is selected according to the arc-burning voltage on each of the materials. In this case, the arc burning voltage on the arc-suppressing part must be less than the burning voltage on the contacting part. With this combination of materials, the breaking capacity of the contact system is maximum.

The contacting part is made of an alloy of copper, bismuth, boron, in the following ratio (in%):

Bismuth 0.05-4

Bor0, OO4-4

Honey Rest,

and the arc section of the alloy of iron, copper, antimony in the following ratio (in%):

Iron50-90

Antimony0, O5-5

CopperE rest

Claims (2)

A free vacuum arc tends to occupy a position in which the voltage of its burning is the least, and the occupation is 1. if there are no obstacles. In the proposed contact system, the direction of the electromagnetic forces coincides with the direction to the place of the most stable arc burning with mallvs directly. If the material of the contacting part has a arc burning voltage less than the material of the arcing part, then the arc tends to install on the contacting part, and the electromagnetic Forces are opposing factors. As tests have shown, in this case (lateriap of the contacting part, such as iron-copper alloy; uram, arc-suppressing material; copper) the arc occupies an intermediate position near the boundary of the two materials, or the contacting agent, Ori, the disconnecting capacity of switching off the bodies is limited. matching the action of electric forces with the direction of increasing arc stability, it is proposed to use metal ceramics with sharply different portions of the heat input accumulator co: l: onentov, iron-copper, iron-copper-antimony on these materials (iron 7O weight, 7 °, copper 26 wt.%, antimony 4 weight%,) the fire burns steadily with small burning voltage. In this case, the contacting part is bypassing from the same material L1-5 from the material with bsiljil pryrlensenem arc burning, for example from an alloy based on copper with added jiBMH, and preventing welding (copper-bismuth boron, bismuth 1 wt.% boron O, O08 weight%, copper else. To add weldability, bismuth is added (0, O5 weight,% - 4 weight,%); Bor (O, OO4 wt.% "4 Aes"%) for improving mechanical properties. Claim 1, A contact system of a vacuum switch containing contacting and arcing parts made of various materials, Increasing the breaking capacity of the switch of the arc extinguishing part of the wavelength of material with a lower voltage of 1 arc or arc, than the contacting arc extinguishing part of metal-ceramic, and the contacting part of copper with additives. 2. The contact system according to claim 1, which means that the contacting part is made of a copper-bismuth-boron alloy, with the following ratio (in%); BKCivtyx0, Oh, Else. from an alloy of iron - Kyd and a dugogas schan yugtseg., ratio (in%): antimony at cl Iron 50-90 Antimony C; 05-5 The rest