Dry capacitive-type through wall-penetrating bushing employing impregnated fiber

Abstract

The invention discloses a dry capacitive-type through wall-penetrating bushing employing an impregnated fiber. The dry capacitive-type through wall-penetrating bushing comprises a capacitor core, a current transformer, a wall-penetrating flange and a protecting tube, wherein the capacitor core is a cylinder; the left end and the right end of the capacitor core are connected with umbrella skirts through epoxy resin; connection terminals are arranged at the outer ends of the umbrella skirts; the wall-penetrating flange is arranged at the middle part of the capacitor core; the protecting tube is arranged in the wall-penetrating flange and wraps the middle part of the capacitor core; the protecting tube and the wall-penetrating flange are clamped together; the current transformer is arranged between the protecting tube and the wall-penetrating flange; and the protecting tube is in a grid structure. The dry capacitive-type through wall-penetrating bushing is rigorous in material selection and scientific in preparation method; the capacitor core adopts the impregnated fiber as a main insulating material; by vacuum casting, the stability is improved; the insulating strength is strengthened; and the produced bushing is good in heat dissipation performance, environment-friendly, portable, firm to install and not easy to fall off.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment, and in particular relates to a glue-impregnated fiber dry-type capacitive type penetrating wall bushing. Background technique [0002] Wall bushings are usually used in power distribution devices in power stations and substations, allowing conductive parts to pass through partitions, walls or other grounding objects, and play the role of insulating support and fixed connection with external wires. In the current power system, the traditional The oil-paper capacitor type and the two wall bushings using PTFE as the capacitor core are mainly used. During long-term operation, the bushing must not only withstand the long-term maximum working voltage, but also withstand various possible overvoltages. The traditional oil-paper capacitive wall-piercing bushing itself is gradually deteriorated due to the insulating medium (cable paper, transformer oil) Various accidents are prone to occur du...

AI Technical Summary

Problems solved by technology

During long-term operation, the bushing must not only withstand the long-term maximum working voltage, but also withstand various possible overvoltages. The traditional oil-paper capacitive wall-piercing bushing itself is gradually deteriorated due to the insulating medium (cable paper, transformer oil) Various accidents are prone to occur due to reasons such as moisture, partial discharge, etc. Among them, the lack of oil in the bushing will cause moisture to invade, resulting in damp insulation, which will cause partial discharge inside the bushing, and even cause an explosion; and another structure, the capacitor core The polytetrafluoroethylene film is used as the insulating layer, and the capacitive screen is made of aluminum foil. Since the gap between the insulating layers or between the insulating layer and the aluminum foil is filled with insulating silicone oil, the core itself is easy to slide the screen, which reduces the stability of the bushing operation.

[0003] Due to the large number of windings of the current transformer required by the secondary equipment, the dedicated current transformer cannot meet the needs of the current circuit of the secondary equipment. Therefore, the current transformer is usually installed in the bushing to provide the secondary equipment with secondary current. , At present, the traditional wall bushing will reserve the position of the current transformer, which is produced and installed separately, which is costly and difficult to install. At the same time, the independently installed current transformer will inevitably condense, causing metal parts to corrode. even insulation breakdown

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