Preparation method of inner core filling material for composite insulated cross arm

Abstract

The invention discloses a preparation method of an inner core filling material for a composite insulated cross arm. The method comprises the steps as follows: a, producing a hollow phenolic microbeadwet mixture; b, after thoroughly cleaning a composite insulated cross arm mold, uniformly spraying a release agent; c, preheating the composite insulated cross arm mold sprayed with the release agent;d, producing a hollow phenolic microbead mixture; e, preparing the inner core filling material for the composite insulated cross arm. The inner core filling material can reduce water absorption to agreat extent so as to improve corrosion resistance and aging resistance and increase insulation distance and creepage distance.

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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