Novel dry-type bush for electric power system

A dry-type bushing and power system technology, applied in the direction of circuits, electrical components, transformer/inductor parts, etc., can solve the problem of high product cost

CN112863786APending Publication Date: 2021-05-28安徽智达电气科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-05-28

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Abstract

The invention discloses a novel dry-type bush for an electric power system. According to the invention, a main insulation core is made of an insulation pipe formed by dipping glass fiber yarns in epoxy resin and conducting pultrude moulding; a semiconductor material is sprayed on the inner cavity wall of the main insulation core, and an equipotential surface is formed on the inner cavity wall of the main insulation core; a current-carrying conducting rod is arranged in the main insulation core in a penetrating manner and is connected with the equipotential surface; a groove is formed in the outer wall of the main insulation core; carbon fibers impregnated with epoxy resin are wound in the groove; a mounting flange is glued on the grounding electrode; a silicon rubber umbrella cover is arranged on the main insulation core; an air end electrode of the grounding electrode is wrapped in the silicon rubber umbrella cover; and a conductive joint and a voltage-sharing ball are respectively installed on two sides of the main insulation core. A wide variety range of bushes can be made in the invention; the voltage levels of the bushes may be in a range of 380V-550kV or higher; the current levels of the bushes may be from several amperes to tens of thousands of amperes; the bushes can be used for an alternating-current power system and a direct-current power system; manufacturing cost is low; and explosion risks are avoided.
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Description

Technical field:

[0001] The invention relates to a novel dry bushing used in an electric power system. Background technique:

[0002] At present, high-voltage bushings with a voltage level of 60kv and above are used in power systems, including transformer bushings, reactor bushings, wall bushings, etc. In order to improve electrical performance and reduce partial discharge, all capacitive screen structures are used. Some bushings with a voltage level of 20kv-35kv also adopt this structure in order to improve reliability.

[0003] There are three types of capacitive screen casings used in the market:

[0004] Oil-paper capacitive bushing. Among them, the capacitor core is wound with cable paper and impregnated with transformer oil after vacuum drying. This type of product has low profile, good electrical performance, and low cost, but it has the risk of explosion and fire. It is the product with the greatest safety hazard in the power system, and it needs to be monitored r...

Examples

Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 , a new type of dry bushing for power system of the present invention, including current-carrying conductive rod 1, conductive joint 4, main insulating core 5, carbon fiber ground electrode 6, mounting flange 7, silicone rubber umbrella cover 8 and pressure equalizing ball 9.

[0021] The main insulating core 5 is made of glass fiber yarn impregnated with epoxy resin and made of an insulating tube formed by pultrusion, without a capacitive screen in the middle.

[0022] Spray semiconductor material on the inner cavity wall of the main insulating core 5 and form an equipotential surface on the inner cavity wall of the main insulating core 5. High-voltage electrodes connected together to form a casing.

[0023] A groove is processed at the mounting flange 7 of the main insulating core 5, and carbon fiber impregnated with epoxy resin is wrapped...