Vacuum arc-extinguishing chamber

Abstract

The invention provides a quick arc-extinguishing device for extinguishing an arc of a high-voltage switch cabinet. The quick arc-extinguishing device structurally comprises a fixed contact 2, an arc-extinguishing chamber ceramic shell 3, a moving contact 4, a grounding contact 5, a watchband contact finger 6 and a miniature gas generator 7, wherein the fixed contact 2 is located at the upper part of the arc-extinguishing chamber ceramic shell 3; the grounding contact 5 is located at the lower part of the arc-extinguishing chamber ceramic shell 3 and is grounded; the watchband contact finger 6 is arranged in a groove of the moving contact 4; the moving contact 4 is arranged in a hole in the grounding contact 5; and the miniature gas generator 7 is arranged at the bottom part of the grounding touch 5. The quick arc-extinguishing device has the advantage that a main loop of the switch cabinet is grounded; and a switch cabinet protecting device sends out a circuit breaker breaking command of the cabinet, so that the switch cabinet is powered off. The time from the moment when an arc probe sends out a signal to the moment when an electronic detection device receives the signal is about 2ms; the time from the moment when the electronic detection device sends out the signal to the moment when the quick arc-extinguishing device extinguishes an arc light is about 2ms; and the condition that the arc duration is about 4ms is ensured, so that the arc energy is reduced and the safety of switch cabinet equipment is ensured.

Description

technical field [0001] The invention is a vacuum interrupter, which belongs to the technical field of high-voltage power distribution equipment. Background technique [0002] Arc generation is a common fault in high-voltage switchgear. Using arc protection devices to protect high-voltage switchgears is a solution to avoid accidents caused by arcs. The current working principle of arc protection devices on the market is: the arc detection probe is installed on each of the high-voltage switchgear Compartment, when arc light is detected in the compartment, an electronic pulse signal is sent to the special electronic detection device installed in the secondary instrument room of the high-voltage switch cabinet; the electronic detection device then sends out an electrical signal to open the circuit breaker at the upper level to The switchgear is de-energized. The arc is then extinguished. [0003] The time from the signal sent by the arc probe to the reception of the signal by ...

AI Technical Summary

Problems solved by technology

[0003] The time from the signal sent by the arc probe to the reception of the signal by the electronic detection device is about 2ms, the time from the signal sent by the electronic detection device to the opening of the upper circuit breaker is about 80ms, and the arc in the switchgear lasts for more than 80ms. The temperature and air pressure inside the switchgear rise sharply, which can cause the cabinet body in the high-voltage equipment to be deformed and broken; it may also cause the components to burn out, and the duration of the arc can be reduced to ensure the safe and reliable operation of the switchgear

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