A kind of vacuum arc extinguishing chamber contact

Abstract

The invention provides a vacuum arc extinguishing chamber contact, which includes an anode side contact piece, a cathode side contact piece, an anode side conductive rod, a cathode side conductive rod, an anode side cup holder, anode side spring No. No. 1 spring, No. 1 spring on the cathode side, and No. 2 spring on the cathode side. The invention adopts a spring with high temperature resistance, high strength and high elastic coefficient to achieve the effect of buffering and shock absorption, which is beneficial to the huge impact when the contact is opened and improves the overall mechanical strength. At the same time, springs are used to cleverly design the conversion between the normal working structure of the contact and the structure during breaking. During normal operation, the conductive rod contacts the contact piece, and the cross-sectional area through which the current flows increases, which is beneficial to reducing the temperature rise. Extend contact life. The rotation direction of the spring is clockwise (from the anode to the cathode), and the current during interruption can be used to generate a magnetic field, which strengthens the longitudinal magnetic field twice, alleviates arc contraction and is beneficial to arc extinguishing. The use of springs can effectively control the pressure between the dynamic and static contacts to achieve an effective balance between the increase in contact resistance due to too small pressure and the deformation caused by excessive pressure. The number of slots in the contact piece is increased, which further suppresses eddy currents and reduces residual magnetism. Compared with traditional cup-shaped longitudinal magnetic contacts, the vacuum arc extinguishing chamber contacts provided by the present invention have smaller temperature rise during rated operation, larger longitudinal magnetic field during breaking, higher breaking success rate, strong impact resistance, and small residual magnetism. It helps to further improve the breaking capacity of vacuum circuit breakers.

Description

technical field [0001] The invention relates to the field of electrical equipment, in particular to a vacuum interrupter contact. Background technique [0002] Circuit breakers play dual roles of protection and control in power systems, and their breaking performance is very important. Vacuum circuit breakers, which use vacuum as the insulation and arc-extinguishing medium, occupy an absolute dominant position in the medium-voltage field of power systems due to their excellent performance, and are currently developing in the direction of high voltage and high current. [0003] During the breaking process of the vacuum circuit breaker, the contact material evaporates and ionizes to form a vacuum arc plasma. The vacuum arc will produce an obvious shrinkage effect under the action of a strong magnetic pinch force in the magnetic field, which will cause severe ablation on the contact surface and flow to the arc. The column plasma provides a large amount of metal vapor and parti...

AI Technical Summary

Problems solved by technology

[0004] However, the current longitudinal magnetic contact system has the following defects: 1. When the cup-shaped longitudinal magnetic contact system is running at rated current, due to structural reasons, the conductive area is relatively small, resulting in serious heating of the contacts, posing safety hazards and reducing service life; 2. Due to the large mechanical impact during breaking, the contact structure is easily damaged without a good buffer, which affects its subsequent use; 3. In order to ensure mechanical strength and other related reasons, the magnetic field generated by the current cup-shaped longitudinal magnetic contact Relatively small, it is easy to cause severe ablation of the contact surface when a large current is broken

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