Vacuum arc-extinguishing chamber contact

Abstract

The invention provides a vacuum arc-extinguishing chamber contact. The vacuum arc-extinguishing chamber contact comprises an anode side contact blade, a cathode side contact blade, an anode side conducting rod, a cathode side conducting rod, an anode side cup base, an anode side first spring, an anode side second spring, a cathode side first spring and a cathode side second spring. According to the vacuum arc-extinguishing chamber contact, the springs with high temperature resistance, high strength and high elastic coefficient are adopted, so that the buffering and damping effects are achieved, huge impact during contact breaking is facilitated, and the overall mechanical strength is improved. Meanwhile, the springs are utilized to ingeniously design the switching between the normal working structure and the on-off structure of the contact, the conducting rods make contact with contact pieces in the normal working process, the cross sectional area where current flows is increased, temperature rise can be reduced, and the service life of contacts is prolonged. The springs rotate clockwise (from an anode to a cathode), and the current during switching-on and switching-off can be used for generating a magnetic field, so that the longitudinal magnetic field is secondarily enhanced, arc contraction is relieved, and arc extinguishing is facilitated. The use of the springs can effectively control the pressure between the moving contact and the static contact, thereby achieving the effective balance between the contact resistance increase caused by too small pressure and the deformation caused by excessive pressure. The number of slots of the contact blades is increased, so that eddy current is further inhibited, and residual magnetism is reduced. Compared with a traditional cup-shaped longitudinal magnetic contact, the vacuum arc-extinguishing chamber contact provided by the invention is small in temperature rise during rated operation, large in longitudinal magnetic field during breaking, high in breaking success rate, high in impact resistance and small in residual magnetism, and further improvement of the breaking capacity of a vacuum circuit breaker is facilitated.

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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