Electrical bushing

Abstract

An electric bushing, which comprises a body (1) made of a thick layer (4) of epoxy resin mixture, the inner wall of the body is provided with a busbar pressure equalizing ring (2) and copper spirals are respectively provided at both ends rings (21), which are poured in the thick layer of epoxy resin mixture of the sleeve, a shielding ring (3) is arranged between the equalizing ring and the ground, and arcs ( 31) and its inner and outer surfaces are surrounded by a layer of semiconductor material; the pressure equalizing ring is provided with a spring piece (6) in contact with the bus bar. A voltage equalizing ring and a ground screen shielding ring to eliminate air gap discharge and make the electric field uniform; secondly, a copper spiral ring is added at the end of the voltage equalizing ring to even out the electric field, and to achieve better tightness with the epoxy resin Combined to eliminate the air gap, its structure is reasonable, which can greatly reduce the partial discharge during operation and the phenomenon of bushing discharge arcing, improve the operation safety and reliability, and have a good service life.

Description

technical field [0001] The invention relates to the bushing field, in particular to a power bushing suitable for a power system with an AC power frequency of 50 Hz and a rated voltage of 35 kV. Background technique [0002] At present, insulated power bushings used in China in power systems with an AC power frequency of 50 Hz and a rated voltage of 35 kV are formed by pressing epoxy resin, and their structural design is similar to that of ordinary pipe fittings. For the busbar type bushing, there are some unreasonable things. Another example is the scheme disclosed in "A Chlorinated Polyvinyl Chloride High-Voltage Power Bushing and Fitting" with Chinese Patent No. 02130610.9. Vinyl: 8-15, Heat Stabilizer: 3-4, Lubricant: 2-3, Impact Modifier: 8-10, Processing Modifier: 2-4, Flame Retardant: 3-4, Nano Calcium carbonate: 3; wherein the main components of the pipe fittings are used in parts by weight: chlorinated polyvinyl chloride resin powder: 100, nano-polyvinyl chloride r...

AI Technical Summary

Problems solved by technology

[0003] However, its shortcoming is that the structural design of the chlorinated polyvinyl chloride high-voltage power bushing also fails to fully consider the unreasonableness of eliminating the air gap discharge and making the electric field uniform. Larger, the phenomenon of bushing discharge and arcing is serious, so there are potential safety hazards, and even the bushing is burned and broken down, which affects the normal operation of the power system

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