Switching device applied to low voltage, medium voltage and high voltage short circuit arc extinction

Abstract

The invention relates to a switching device applied to low voltage, medium voltage and high voltage short circuit arc extinction. The device comprises a casing, wherein a fixed contact and an air cylinder are arranged at the two ends of a casing inner chamber respectively, a piston is arranged in the air cylinder, a gas generator is arranged at the bottom of the air cylinder, a moving contact is arranged at the front end of the piston, the air cylinder, the piston and the moving contact are electrically connected, a vacuum chamber is formed in one side, close to the fixed contact, of the casing inner chamber, an anti-rebounding buckle is arranged at the front end of the fixed contact, a guide limit groove corresponding to the anti-rebounding buckle is formed in the front end of the moving contact, the front end of the anti-rebounding buckle and the guide limit groove are at an included angle beta ranging from 5 degrees to 15 degrees, a limit ring is arranged on the moving contact, the guide limit groove is formed between the limit ring and the moving contact, and when the moving contact is hit into the fixed contact, the anti-rebounding buckle is inserted into the guide limit groove. The switching device applied to low voltage, medium voltage and high voltage short circuit arc extinction has the advantage that the locking reliability is higher.

Description

technical field [0001] The invention relates to a switchgear, in particular to a short-circuit switchgear used in short-circuit systems for low-voltage, medium-voltage and high-voltage short-circuit arc extinguishing. Background technique [0002] Low-voltage, medium-voltage and high-voltage switchgear components have the task of distributing energy flows and ensuring safe operation. In the unlikely event of an internal fault (fault arc), the safety of the installation and the safety of persons must also be ensured. Due to its temperature, an arc fault occurring within a switchgear assembly produces a sharp gas pressure rise within a period of a few milliseconds, and this can cause the switchgear assembly to be destroyed by an explosion. Therefore, take steps to dissipate the pressure as quickly as possible. Furthermore, it is desirable to confine arc faults to the relevant area and never endanger operators. [0003] By proper design, eg by internal subdivision (division ...

AI Technical Summary

Problems solved by technology

[0010] Both the moving contact and the static contact of the above-mentioned patent adopt a conical complementary structure. Although the springback of the static contact can be prevented through its structural characteristics, if the force of the moving contact is too large, it may still rebound. If the bomb is fired, the entire short-circuit device will fail, and the damage will be extremely serious.

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