A high-voltage AC-DC wall-piercing bushing above 35kV and its preparation method

Abstract

The invention discloses a high-voltage AC / DC wall-piercing bushing above 35kV and a preparation method thereof. The wall-piercing bushing is suitable for a voltage level above 35kV and includes a guide rod and a main insulation sheathed on the guide rod. The main insulation includes The pressure equalizing layer and the current limiting layer are sequentially arranged from the inside to the outside. The pressure equalizing layer is sleeved on the guide rod, and the position near the middle of the current limiting layer is provided with a flange and an electrode extension layer, and the electrode extension layer is embedded in the current limiting layer. The flange is sleeved on the electrode extension layer, and also includes a plurality of outer insulating sheds, the plurality of outer insulating sheds are sleeved on the main insulation, and the plurality of outer insulating sheds are respectively located on both axial sides of the flange. The invention has a simple structure, simplifies the preparation process, and is convenient for processing. In addition, it can greatly reduce the size of the main insulation, reduce the volume of the bushing, improve the heat dissipation problem of the bushing at a high voltage level, improve the reliability of the bushing, and meet the miniaturization of electrical equipment. direction of development.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical equipment, in particular to a high-voltage AC and DC wall-penetrating bushing of more than 35kV and a preparation method thereof. Background technique [0002] Wall bushings are often used in the field of high-voltage power transmission. The electrode structure of the wall bushings is a typical plug-in structure. As the connection structure between the wall bushings and the wall, the flange is mainly used for mechanical fixing. The electrode structure of the through-wall casing is composed of the high-voltage electrode guide rod inserted into the center of the ground electrode flange, so it is a highly uneven electric field with a strong vertical electric field component. If the local field strength at the flange is too large, it is easy to cause the aging of the insulating material, or even breakdown, which affects the insulation performance. At the same time, the axial field int...

AI Technical Summary

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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