Switchgear for short circuit arc extinguishing for low voltage, medium voltage or high voltage

Abstract

The invention relates to a switchgear for low-voltage, medium-voltage or high-voltage short-circuit arc extinguishing, which includes a housing, static contacts and a cylinder are respectively arranged at both ends of the inner cavity of the housing, a piston is arranged in the cylinder, and a gas generator is arranged at the bottom of the cylinder , the front end of the piston is provided with a moving contact, the cylinder, the piston and the moving contact are electrically connected, the side of the housing cavity close to the static contact is a vacuum chamber, and the front end of the static contact is provided with an anti-rebound buckle, The front end of the movable contact is provided with a guide limit groove corresponding to the anti-rebound buckle, and the front end of the anti-rebound buckle forms an angle β with the guide limit groove, and the angle β ranges from 5° to 15°. The moving contact is provided with a positioning ring, and a guiding and limiting groove is formed between the positioning ring and the moving contact. When the moving contact is driven into the static contact, the anti-rebound buckle is inserted into the guiding and limiting groove. The beneficial effect of the present invention is 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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