Composite electrical cross arm and design method of structure thereof

Abstract

The invention relates to a composite electrical cross arm and a design method of a structure thereof, belonging to the design field of assorted structural parts of transmission poles. The electrical cross arm is of cylindrical solid structure and comprises an inner core layer, a middle layer and an outer layer from inside to outside in a radial direction. The middle layer is the base and is a composite hollow pipe, the core of the pipe is filled with foaming polyurethane material to form the inner core layer, and the outer surface of the pipe is wound with glass fiber polymer matrix composite material to form the outer layer. The design method comprises the steps of: carrying out solid modeling, meshing, load applying and analog computation by utilizing the operation order of an ANSYS and confirming the structure setting, optimization of outer winding thickness and direction angle of the cross arm so that the cross arm meet the requirements of a design safety coefficient value and deflection. The cross arm produced by the design method has the advantages of light weight, good insulation performance, convenient installation and high section bending resistance index, and can effectively improve a safety margin when being applied to an actual circuit, can reduce the cost and is beneficial for popularization and application.

Description

technical field [0001] The invention relates to a composite material power cross arm and a design method for its structure, which belongs to the design field of supporting structural parts of transmission poles. Background technique [0002] In the field of power facilities, the cross arm for transmission lines is an important supporting structural part of the transmission pole. One end of the cross arm is connected to the main body of the transmission pole, and the other end is hung with the transmission wire. Traditional cross-arms usually use iron cross-arms and wooden cross-arms. Iron cross-arms and wooden cross-arms have exposed various problems during long-term operation, such as heavy weight, perishability, rust or cracking, durability, resistance Poor flammability and insulation performance, low strength, short service life, difficult construction, transportation and operation and maintenance, which consumes materials and increases the labor intensity of operators; t...

AI Technical Summary

Problems solved by technology

Traditional cross-arms usually use iron cross-arms and wooden cross-arms. Iron cross-arms and wooden cross-arms have exposed various problems during long-term operation, such as heavy weight, perishability, rust or cracking, durability, resistance Poor flammability and insulation performance, low strength, short service life, difficult construction, transportation and operation and maintenance, which consumes materials and increases the labor intensity of operators; there are also various safety hazards

In order to solve the defects of poor insulation performance and short service life of the existing cross-arms, there are FRP cross-arms processed with composite materials. Lightweight, corrosion-resistant and fatigue-resistant, durable and electrical insulation, performance can be designed, etc., using this fiberglass cross-arm to replace iron and wooden cross-arms improves the electrical insulation performance of the cross-arm and solves the problem of iron cross-arms. There are various defects in the cross-arm and wooden cross-arm; however, because the FRP cross-arm still uses a solid structure, that is, the entire cross-arm is made of resin-based reinforced glass fiber, although its weight is slightly lower than that of the iron cross-arm. There is a reduction, but the weight advantage is not great; at the same time, the cross-arm structure layer is realized by winding, which increases the material cost much more than the iron cross-arm and wooden cross-arm. It can meet the requirements of ensuring rigidity under load and having good insulation performance. Under the previous question, using resin-based reinforced glass fiber to make a solid electric cross-arm, the safety weight under the load is not significantly different from the safety weight of the traditional cross-arm, and the cost is high, so it cannot be popularized and implemented

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