Insulated tubular busbar having composite insulation layer and in voltage class of 1kV and below and preparation method thereof

Abstract

The invention discloses an insulated tubular busbar having a cold-hot shrinkage composite insulation layer and in a voltage class of 1kV and below and a preparation method thereof. The cross section structure of a tubular busbar is a four-layer structure, which is formed by a metal tube conductor layer, a cold-hot shrinkage composite insulation layer (the inner layer is an ethylene propylene diene monomer cold shrinkage layer, and the outer layer is a polyolefin hot shrinkage layer), a metal grounding shielding layer and an outer protection cover layer from the inside out in sequence. The provided insulated tubular busbar product suitable for the voltage class of 1kV and below is characterized in that a shrinkage tube co-extruded by the cold-hot shrinkage composite insulation layer can be fit to a metal conductor pipe very well without leaving a gap inbetween after heating shrinkage, and the phenomenon of heat expansion and cold contraction does not appear due to the influence of hot and cold environment. The preparation method is simple and feasible; works and labor intensity are reduced; product quality is not influenced by human factors; production efficiency and finished product ratio are improved greatly; cost is reduced; and comprehensive competitiveness of an enterprise is improved.

Description

technical field [0001] The invention relates to a tubular busbar with a voltage level of 1 kV and below and a preparation method thereof, belonging to the manufacturing and processing field of the tubular busbar with a cold-shrinkable-heat-shrinkable composite insulating layer. Background technique [0002] Insulated tubular busbar has the characteristics of high current, good heat dissipation, low skin effect, low power loss, high mechanical strength, good insulation performance, anti-environmental interference, high safety factor, convenient installation and maintenance, and long service life. It has been recognized and accepted by more and more customers, and has been widely used in power transmission and transformation lines. However, at present, the manufacturing process of the insulating layer of the insulating tubular bus produced in China still needs to be improved and perfected. For example, there is a gap between the polytetrafluoroethylene-wrapped insulating tubul...

AI Technical Summary

Problems solved by technology

However, at present, the manufacturing process of the insulating layer of the insulating tubular bus produced in China still needs to be improved and perfected. For example, there is a gap between the polytetrafluoroethylene-wrapped insulating tubular bus and the wrapping insulating layer, and there is a problem of high partial discharge; Epoxy resin cast insulated tubular busbars have high cost, and the thermal expansion and contraction of insulating materials and conductor materials are inconsistent, which may cause cracks in the insulating layer; ethylene-propylene rubber co-extruded insulating tubular busbars cannot directly extrude the elbow structure. After the package is completed, there are quality problems such as stress concentration in the insulation layer or cracking of the conductor in the bent pipe.

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