Thermal shrinkable flexible conductive tube and production process thereof

Abstract

The invention discloses a thermal shrinkable flexible conductive tube and a production process thereof, belongs to the technical field of cables and in particular relates to a tube bus matched product. According to a formula, the thermal shrinkable conductive tube is characterized by comprising the following raw materials in part by mass: 50 to 60 parts of high polymer, 30 to 40 parts of conductive filler, 5 to 10 parts of white oil, 5 to 10 parts of polyurethane (PE) wax, 5 to 10 parts of phosphate, 1 to 5 parts of sodium benzoate and 1 to 2 parts of antioxidant. The high polymer obtained bypreheating, melting and mixing an ethylene vinyl acetate (EVA) hot melt adhesive and polyethylene terephthalate (PET) has a smooth and glossy surface, excellent electric insulativity and a higher electrical property at a high temperature and high frequency. Special conductive carbon black serves as the conductive filler, so the conductive filler has higher conductive performance due to a meshed structure; and when the conductive filler is mixed with the other raw materials, the conductive performance of the thermal shrinkable flexible conductive tube is improved.

Description

technical field [0001] The invention belongs to the technical field of electric cables, and in particular relates to a matching product of a pipe busbar. Background technique [0002] With the development of the economy, my country pays more and more attention to the power supply quality and guarantee ability of the power grid. In the process of power grid transformation and construction, my country adopts rectangular power supply busbar as the main facility for electrical equipment connection, but rectangular busbar has obvious shortcomings: obvious skin effect, serious eddy current loss, and the loss accounts for about 80% of the entire line loss. It accounts for 20% of the loss of the whole substation system. The composite pipe busbars produced by some foreign companies are directly laminated and cured on copper or aluminum pipes with epoxy resin, and there is no conductive non-metallic material as a buffer layer, which will cause changes in the cable due to cold and heat...

AI Technical Summary

Problems solved by technology

In the process of power grid transformation and construction, my country adopts rectangular power supply busbar as the main facility for electrical equipment connection, but rectangular busbar has obvious shortcomings: obvious skin effect, serious eddy current loss, and the loss accounts for about 80% of the entire line loss. Account for 20% of the loss of the entire substation system

The composite pipe busbars produced by some foreign companies are directly laminated and cured on copper or aluminum pipes with epoxy resin, and there is no conductive non-metallic material as a buffer layer, which will cause changes in the cable due to cold and heat cycles during operation. There is a gap between the outer wall of the metal tube and the resin insulation layer, which causes an increase in partial discharge, a decrease in electrical performance, and eventually leads to breakdown

Chinese manufacturers adopt the method of wrapping semi-conductive tape as a buffer layer to continuously wrap the semi-conductive tape outside the metal tube conductor. This method requires a long winding time and wastes a lot of manpower, material and financial resources, and because it is artificial Winding the semi-conductive tape will lead to spiral patterns on the winding layer, uneven surface, resulting in uneven electric field distribution, unstable long-term operation, and unstable partial discharge performance

At present, some manufacturers use conductive tubes to cover the conductors, so that manual winding is not required, and the conductive tubes are evenly wound. However, the production process of conductive tubes is complicated and difficult to implement, and the electrical properties of the prepared conductive tubes are not good at high temperature and high frequency. Excellent, low elongation