Low-voltage alternating-current and direct-current wall bushing and preparation method thereof

Abstract

The invention discloses a low-voltage alternating-current and direct-current wall bushing and a preparation method thereof. The wall bushing is suitable for voltage classes of 35kV or below. The wallbushing comprises a guide rod and a main insulator sleeved on the guide rod; the main insulator comprises a current limiting layer; the current limiting layer is sleeved on the guide rod; a flange andan electrode extension layer are arranged at the position, close to the middle, of the current limiting layer; the electrode extension layer is embedded in the current limiting layer; the flange is sleeved on the electrode extension layer; the wall bushing also comprises a plurality of external insulation umbrella skirts; the plurality of external insulation umbrella skirts are sleeved on the main insulator; and the plurality of external insulation umbrella skirts are respectively located at the two axial sides of the flange. The wall bushing has the advantages that the structure is simple, the preparation process is simplified, the processing is convenient, in addition, the main insulator size can be greatly reduced, the size of the bushing is reduced, the heat dissipation problem of thebushing under a high-voltage grade is improved, the reliability of the bushing is improved, and the miniaturization development direction of electrical equipment is met.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical equipment, in particular to a low-voltage AC-DC wall bushing and a preparation method thereof. Background technique [0002] In the field of high-voltage power transmission, wall-piercing bushings are often used. The electrode structure of wall-piercing bushings is a typical plug-in structure. The flange is used as a connection structure between wall-piercing bushings and walls, etc., mainly for mechanical fixation. The electrode structure of the wall-through bushing is composed of a high-voltage electrode guide rod inserted into the center of the ground electrode flange, so it is an extremely non-uniform electric field with a strong vertical electric field component. If the local field strength at the flange is too large, it will easily cause the aging of the insulating material, or even breakdown, which will affect the insulation performance. At the same time, the axial field in...

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Problems solved by technology

The wall-piercing bushing of the related art adopts the traditional capacitive bushing. The traditional capacitive bushing uses the capacitor core as the main insulation to forcefully regulate the radial and axial field strength distribution of the bushing. The traditional capacitive bushing uses Glue-impregnated paper or oil-impregnated paper is used as the main insulation material. The structure of the capacitor core is more complicated, and the process flow is more complicated. Generally, the long-term working field strength of glue-impregnated paper or oil-impregnated paper insulation materials is 4MV / m, and the dielectric strength is low. Therefore, In order to meet the insulation strength, the size of the capacitor core cannot be made smaller, which cannot meet the development direction of the miniaturization of electrical equipment

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