Rubber and plastic composite insulating pipe bus and manufacturing method thereof

Abstract

The invention relates to a rubber and plastic composite insulating pipe bus and a manufacturing method thereof in a power transmission and transformation system. The bus comprises a conductor tube, a conductor shielding layer, a composite insulation layer, an insulation shielding layer, a grounding layer and an outer sheath layer. The composite insulation layer is made through compounding a liquid silicone rubber and a cross-linked polyethylene insulating tape and is twined outside the conductor shielding layer. Through heating, vulcanization and solidification, an integral insulation structure is formed. By using the technology, insulating making can be performed on the pipe buses with any shapes, extrusion equipment is not needed, and production processes are simplified. The pipe bus and the method have characteristics that an insulating property is good; partial discharge is low; reliability is high and so on.

Description

technical field [0001] The invention relates to a rubber-plastic composite insulating pipe busbar used in the field of high voltage transmission technology. Specifically, the invention relates to a liquid silicone rubber and cross-linked polyethylene composite insulation structure and its production method. Background technique [0002] At present, there is an extruded insulating pipe busbar, the insulation of which is mainly made of EPDM or silicone rubber through an extruder through double-layer co-extrusion or three-layer co-extrusion. The weight of a single pipe busbar is large and the length is short. It is difficult to avoid scratches and bruises in the process, and it is impossible to extrude the pipe busbars with bends; in practical applications, there are many special-shaped bends for the insulating pipe busbars, so that some 6m There are as many as 6 bending angles with different bending degrees and bending directions on the long pipe mother; moreover, in practica...

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Problems solved by technology

[0002] At present, there is an extruded insulating pipe busbar, the insulation of which is mainly made of EPDM or silicone rubber through an extruder through double-layer co-extrusion or three-layer co-extrusion. The weight of a single pipe busbar is large and the length is short. It is difficult to avoid scratches and bruises in the process, and it is impossible to extrude the pipe busbars with bends; in practical applications, there are many special-shaped bends for the insulating pipe busbars, so that some 6m There are as many as 6 bending angles with different bending degrees and bending directions on the long pipe mother; moreover, in practical applications, the pipe bus has a small bending radius, the general bending radius is 350mm and 450mm, and the diameter of the pipe mother is 100mm ~ 150mm ; When the naked pipe was bent, there was a crack in the 90° bend; after the insulation layer was squeezed, the bending experiment also had the overall fracture of the conductor pipe when it was bent; silicone rubber and The advantage of EPDM rubber is that it is flexible, but its disadvantage is that it has poor tear resistance. Therefore, after the insulation layer is squeezed and then the busbar is bent, the damage to the insulation layer and the conductor tube is greater, and there is a certain safety risk.

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