A high voltage bushing and method of passing voltage and current through building or wall

Abstract

The invention discloses a high voltage bushing and method for enabling voltage and current to pass through a building or a wall, and belongs to the technical field of high-voltage electrical equipment. The high voltage bushing comprises a grounding flange cylinder, wherein a capacitor core is fixedly installed in the grounding flange cylinder; two internal grounding shielding cylinders connected to the two ends of the grounding flange cylinder respectively; a high-voltage conducting rod fixed in the capacitor core; the capacitor core, wherein multiple layers of capacitor plates are arranged inthe capacitor core, and a high-voltage conducting rod penetrates through the center of the capacitor core; two insulator jackets respectively sleeved outside the two internal grounding shielding cylinders and respectively connected with the grounding flange cylinder; and an insulating filling medium filled in the insulator jacket and between the internal grounding shielding cylinders. According to the invention, reasonable distribution of internal and external electric fields of the high-voltage wall bushing can be ensured, and the heat dissipation performance and the end mechanical load endurance capacity are improved.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical equipment, and more particularly, to a high-voltage bushing and a method for passing voltage and current through buildings or walls. Background technique [0002] High-voltage wall bushings are used to connect the busbars in AC substations or DC converter stations, and pass high voltage and high current through buildings or walls. The main insulation of the high-voltage wall bushing bears the full voltage of the busbar, and the current-carrying conductor carries the full current of the busbar. In order to prevent slipping and flashing, high-voltage wall bushings above 72.5kV usually use capacitor plates as capacitor cores to improve electric field distribution, that is, capacitive high-voltage wall bushings. The capacitive high-voltage wall bushing has internal insulation and external insulation. The internal insulation is called the main insulation (that is, the capacitor core), ...

AI Technical Summary

Problems solved by technology

The first type is glue-impregnated paper-filled SF6 gas-insulated capacitive high-voltage wall bushing. This type of wall bushing is a capacitive high-voltage wall bushing that uses an epoxy resin-impregnated paper capacitor core as the main insulation. There is no dedicated grounding shield inside the grounding flange of the bushing; the second type is a pure SF6 gas insulated non-capacitive high-voltage wall bushing, which uses two grounding shields on both sides of the grounding flange. Cylinder structure, high-voltage conductive rods and grounding shielding cylinders form coaxial cylindrical electrodes, the main insulation is a pure SF6 gas gap, but it is a non-capacitive bushing without a capacitor core

[0006] At present, the first type of high-voltage wall bushing with rubber-impregnated paper capacitor core filled with SF6 gas insulation, due to the long capacitor core, more than 60% of the high-voltage conductive rod is covered by the insulating capacitor core, and the thermal conductivity of the insulating capacitor core Poor quality and high density make this type of casing heavy in weight and weak in thermal conductivity

The second type of pure SF6 gas-insulated non-capacitive high-voltage wall bushing bushing without capacitor core, because the capacitor-free core adjusts the distribution of internal and external electric fields, and there is no support structure in the middle of the bushing, the internal radial field of the bushing is strong; When subjected to a large cantilever load, the high-voltage conductive rod in the middle will be eccentric, and the overall mechanical performance is low

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