20KV sleeve

Abstract

The invention discloses a 20KV sleeve, which comprises a high-voltage charged body, an equalizing shield, an inserted nut and a solid insulating layer, wherein the high-voltage charged body is a dumbbell-shaped rod body with two large ends; the equalizing shield is an annular shielding mesh cover, is sleeved in the middle of the high-voltage charged body and is coaxial with the high-voltage charged body; a space is formed between the inner wall of the equalizing shield and the high-voltage charged body; the inner diameter of the equalizing shield is 2-4 times of the middle diameter of the high-voltage charged body; the equalizing shield is fixed on the inserted nut through four pins which are uniformly distributed on the outer wall of the equalizing shield; and the solid insulating layer is cast on the high-voltage charged body, the equalizing shield and the inserted nut, so that the solid insulating layer, the high-voltage charged body, the equalizing shield and the inserted nut form the 20KV sleeve. The 20KV sleeve solves the problem of poor dynamic thermal stability of a sleeve with a voltage below a 20KV level, is safe and simple, and reduces noises caused by internal insulation corona discharge due to a non-uniform electric field.

Description

technical field [0001] The invention relates to a bushing for 20KV, which is suitable for application on cabinets in the high-voltage switch cabinet industry. Background technique [0002] The existing 20KV bus lifting cabinet uses a 20KV wall bushing. Generally, the upper main busbar copper bar (high-voltage live body) is turned up through the wall bushing, and the lower part is fixed with an insulating support. The fixing of the upper part is fixed by the bus bar of the combined cabinet, such as figure 1 shown. [0003] The prior art has the following disadvantages: [0004] (1) The dynamic and thermal stability is not good, and the gap of the wall bushing is too large to fix the main bus bar (high-voltage live body). The main bus bar is fixed on the frame, and the lower end needs to use insulating support. When subjected to the rated short-time withstand current, the main busbar (high-voltage electrified body) will swing under the action of electromotive force, and in ...

AI Technical Summary

Problems solved by technology

When the main busbar of the combined cabinet transmits current, the mechanical stress will cause the electric field on the main busbar (high voltage electrified body) to be uneven

[0006] (3) When the 20KV main bus bar passes through the wall bushing, the uneven electric field will cause the sound of corona

Although there is no problem with safety when 20KV is working normally, the sound of corona will cause the operator to panic

[0007] (4) There is a gap between the wall-piercing bushing and the main busbar (high-voltage electrified body). The creepage distance of the high-voltage electrified body must be considered along the insulation surface. Often, in actual operation, designers use the air gap plus the creepage distance of the wall-piercing pipe as the Climbing distance, in fact, climbing distance is not enough

[0008] At present, many manufacturers have not effectively solved the above shortcomings, so there is a great need for a bus bushing with a simple structure and a uniform electric field to undertake the functions of conducting bus current and insulating support

Images