Composite shielding insulated tube type bus based on co-extrusion layer and manufacturing method

Abstract

The invention discloses a composite shielding insulated tube type bus based on a co-extrusion layer and a manufacturing method. The bus comprises a conductor (1) serving as a main body, a first layer body wrapping the conductor (1) and formed in a co-extrusion manner, and a second layer body wrapping the conductor (1) and distributed in a superposition manner, wherein the first layer body wraps the conductor (1) in the co-extrusion manner, and the second layer body wraps the conductor (1), thereby preventing gaps and bubbles between the first layer body and the conductor (1); and insulating tapes in a lapping form are no longer used, so that the reliability of the insulated tube type bus is improved.

Description

1. Technical field [0001] The invention relates to a composite shielding insulating tubular bus bar based on a co-extrusion layer and a preparation method thereof, belonging to the field of bus bar production and manufacturing. 2. Background technology [0002] In order to meet the needs of large rated current of the low-voltage side of the transformer with large main capacity, the tubular busbar has the technology of large carrying capacity, low skin effect, low temperature rise, good insulation performance, good heat dissipation and high mechanical strength. Performance, replacing the rectangular busbar and bare busbar, so the tubular busbar and its preparation method are an important electrical component. In the existing tubular busbar and its preparation method, the main insulating material used to insulate the tubular busbar is polyethylene , PTFE, silicone rubber, EPDM, epoxy resin rubber and other rubber and plastic materials, commonly used production processes includ...

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Problems solved by technology

Patent CN101339824A discloses the production of insulating tubular bus bars in the form of wrapping with insulating tape. This method has complex process, low efficiency and difficult quality control. The liquid is solidified to fill the gap, which increases the complexity of the process. The winding of the insulating tape and the uniformity of the insulating liquid application are uncontrollable. The gap and air bubbles are inevitable, which is easy to cause breakdown and high partial discharge, which will shorten the service life of the product. short

Epoxy resin cast insulated tubular busbar, ordinary epoxy resin has high hardness, high brittleness, and poor impact resistance. Due to the different expansion coefficients of insulating materials and conductor materials, inconsistent thermal expansion and contraction may cause cracks in the insulating layer. Due to shielding There are gaps and air bubbles between layers, insulation and wires, which affect the reliability of the performance of the insulated tubular busbar

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