Protection device of cylindrical self-healing capacitor with overpressure isolator

Abstract

The invention provides a protection device of a cylindrical self-healing capacitor with an overpressure isolator. The protection device comprises an upper fixing member mounted on a cover plate of the capacitor, a lower fixing member mounted below an overpressure isolation groove of the capacitor, and a normally-open contact switch and a normally-closed contact switch having one ends mounted on the upper fixing member and the other ends mounted on the lower fixing member, wherein the switching-on and switching-off of the normally-open contact switch and the normally-closed contact switch change with the relative displacement of the upper fixing member and the lower fixing member. When the overpressure isolation groove of a defective capacitor has an action distance of 3 to 4 mm, the protection device provided by the invention can provide an auxiliary signal to prompt operators on duty, or trigger a fault alarm device, or directly connect a switch control circuit to disconnect the defective capacitor through the switch, thereby preventing the seepage of liquid impregnant or even avoiding the occurrence of a fire due to the breakage of a capacitor casing. In addition, the protectiondevice can detect the damaged capacitor in time so as to avoid the occurrence of serious circuit faults and prevent accident extension.

Description

technical field [0001] The invention belongs to the category of electric equipment coupling capacitor products, and relates to a protection device for a cylindrical self-healing capacitor with a pressure isolator. Background technique [0002] Most of the cylindrical self-healing capacitors use the entire overpressure protection device, that is, the overpressure isolator. When the protection device operates, the inner lead of the capacitor is directly pulled off to make the capacitor exit the working circuit. The fault action distance is generally 6-10mm (such as figure 1 and figure 2 As shown), its disadvantages are: 1. The capacitor shell may be ruptured due to the excessive arc current when the lead wire is broken, and the liquid impregnating agent may leak or even catch fire; 2. It may be due to the characteristics of the circuit, even if the capacitor is damaged, it should not The circuit exits, but the capacitor has been damaged after all. If it is not repaired or re...

AI Technical Summary

Problems solved by technology

[0002] Most of the cylindrical self-healing capacitors use the entire overpressure protection device, that is, the overpressure isolator. When the protection device operates, the inner lead of the capacitor is directly pulled off to make the capacitor exit the working circuit. The fault action distance is generally 6-10mm (such as figure 1 and figure 2 As shown), its disadvantages are: 1. The capacitor shell may be ruptured due to the excessive arc current when the lead wire is broken, and the liquid impregnating agent may leak or even catch fire; 2. It may be due to the characteristics of the circuit, even if the capacitor is damaged, it should not The circuit exits, but the capacitor is damaged after all. If it is not repaired or replaced in time, it may cause more serious failures in the entire circuit and expand the accident.

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