Preparation method of core filling material for composite insulated cross arm

Abstract

The invention discloses a preparation method of a core filling material for a composite insulated cross arm, and belongs to the technical field of preparation of the inner core filling material of thecomposite insulated cross arm. The preparation method comprises following steps: a, preparation of modified hollow organic microbeads; b, preparation of raw materials of the core filling material; c,curing molding of the raw materials of the core filling material. The preparation method has the characteristics of low hole overlapping and hole opening rates, high rate of closed hole and low waterabsorption rate. Therefore, the water absorption rate can be reduced to the great degree, corrosion resistance and aging resistance of the composite insulated cross arm are improved, and the purposeof improving internal insulation performance is achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of a composite insulating cross-arm inner core filling material. Background technique [0002] With the improvement of the technical level of my country's power grid, the transmission line presents a long-distance, large-scale and large-scale development trend. At present, my country's transmission lines are still operating in the form of traditional iron towers, steel pipe poles, and concrete poles equipped with steel cross arms and suspended insulator strings. In order to meet the requirements of the corresponding insulation distance and creepage distance, the steel cross-arm must be equipped with very long insulator strings. In severe weather such as strong winds, rain and snow, wind deflection flashovers and lightning flashovers often occur due to wire dancing. , icing flashover, pollution flashover and other faults seriously threaten the safe operation of transmission lines. The higher ...

AI Technical Summary

Problems solved by technology

In terms of the performance of the polyurethane material itself, the molded polyurethane foam has the characteristics of both solid and hollow materials, has low density and good insulation performance, but has the following problems: first, the internal pores are not evenly arranged, and the closed cell rate and pore size It will affect the internal field strength after water penetration, resulting in a decrease in the breakdown voltage of polyurethane; secondly, the performance parameters of different components of polyurethane materials have an impact on dye penetration experiments and water diffusion experiments

[0005] In long-term actual operation, the polyurethane inner core is inevitably affected by complex environmental factors. However, pure polyurethane rigid foam materials have strong water absorption and poor weather resistance.

The presence of moisture reduces the breakdown strength of polyurethane foam, leading to an increase in its leakage current and greatly reducing its insulating properties

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