Contact of vacuum arc extinguishing chamber

Abstract

The invention provides a contact of a vacuum arc extinguishing chamber. The contact comprises a first contact and a second contact. The first contact is connected with a first conducting rod, and the second contact is connected with a second conducting rod. An arc ignition contact is arranged on and protrudes out of an end surface of the first contact. The arc ignition contact is connected inside the first conducting rod by a spring. An auxiliary contact is arranged on an end surface of the second contact and is used to cooperate with the arc ignition contact to generate an arc. The invention provides the contact reducing the breakdown field strength, controlling the arcing point, improving the interrupting capability of the vacuum arc extinguishing chamber, and having a low cost.

Description

technical field [0001] The invention relates to the technical field of electric switches, in particular to a contact of a vacuum interrupter. Background technique [0002] The vacuum interrupter, also known as the vacuum switch tube, is the core component of the medium and high voltage power switch. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off through the excellent insulation of the vacuum in the tube, so as to avoid accidents and accidents. It is mainly used in the transmission and distribution control system of electric power. [0003] The vacuum interrupter is mainly composed of airtight insulating shell, shielding system, dynamic and static contacts, bellows, conductive rods and other parts. Since the dynamic and static contacts of the vacuum interrupter are the parts that generate and extinguish the arc, the protection of the contact The material and structure requirements are relativel...

AI Technical Summary

Problems solved by technology

[0003] The vacuum interrupter is mainly composed of airtight insulating shell, shielding system, dynamic and static contacts, bellows, conductive rods and other parts. Since the dynamic and static contacts of the vacuum interrupter are the parts that generate and extinguish the arc, the protection of the contact The material and structure requirements are relatively high. In the existing technology, most of the materials with high pressure resistance and electric corrosion resistance such as copper-chromium alloy are used to make the moving contact and the static contact. The moving contact and the static contact pass through Spherical or plane surface contact, this contact has the following disadvantages: first, when the switch is closed, the static contact and the moving contact are in contact, and the arc may generate an arc at any position where the static contact and the moving contact contact , and under the action of the arc, the metal at the position where the arc is generated is easy to evaporate, and the contact end surface of the moving contact and the static contact is easy to be uneven, thereby increasing the contact resistance between the moving contact and the static contact, and affecting the vacuum arc extinguishing Chamber breaking capacity

Second, because the moving contact and the static contact are in surface contact, the effective area is large when the gate is opened, and the breakdown field strength is high, which is easy to cause a large arc and cause burning of the contact surface

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