Electrical bushing

Abstract

A power casing comprises a body (1) made of a thick layer (4) with epoxy resin mixed material. The internal wall of the body is provided with a bus voltage-equalizing ring (2), and two ends are respectively provided with a copper spiral ring (21); the bus voltage-equalizing ring and the copper spiral rings are cast in the thick layer of epoxy resin mixed material of the casing; a shielding ring (3) is arranged between the voltage-equalizing ring and the grounding; two ends of the shielding ring are respectively provided with an arc (3) the internal and the external surfaces of which are encased with semiconductor material layers; the voltage-equalizing ring is provided with a spring leap (6) which contacts with the bus. The invention has the advantage that the voltage-equalizing ring and an earth shielding ring are additionally arranged in epoxy resin of a bus casing with a nominal voltage of 35kV to eliminate partial discharge and equalize the electric field; secondly, the end parts of the voltage-equalizing ring are additionally provided with the copper spiral rings to equalize the electric field to achieve better and closer combination with the epoxy resin thick layer and eliminate the air space. The invention has rational structure and can considerably reduce the partial discharge quantity and the phenomenon of casing discharge arc in operation and improve the operational safety and reliability; in addition, the invention has a long 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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