Wind excitation vibration wear simulation test device for composite insulated cross arm

Abstract

The invention discloses a wind excitation vibration wear simulation test device for a composite insulated cross arm, which comprises a swing end driving mechanism, a sliding connecting rod and a composite insulated cross arm simulation assembly which are arranged on a combined rack according to a design position. The swing end driving mechanism is connected with the sliding connecting rod through a centering slider-crank mechanism; the sliding connecting rod is connected to the bottom of the composite insulated cross arm simulation assembly, the swing end driving mechanism drives the sliding connecting rod to move horizontally through the centering type crank sliding block mechanism, and the sliding connecting rod drives the composite insulated cross arm simulation assembly to swing back and forth. In the swinging process, a measuring device on the composite insulated cross arm simulation assembly monitors in real time and transmits data to a computer, and corresponding monitoring data are obtained. A test platform provided by the invention is simple in structure and convenient to use, and can simulate low-frequency large-amplitude swing and high-frequency low-amplitude aeolian vibration of a lead in a distribution line, thereby providing convenience for research on wind-excited vibration wear characteristics of suspension string fittings.

Description

technical field [0001] The invention relates to the technical field of composite insulating cross-arm aging characteristics and state evaluation research, in particular to a composite insulating cross-arm wind-excited vibration wear simulation test device. Background technique [0002] Composite insulating cross arm is a new material cross arm, small in size, light in weight, high in mechanical strength and superior in electrical performance. It has the advantages of corrosion resistance, anti-aging, reduced line maintenance costs, reduced transportation and assembly costs, improved insulation level of distribution lines, etc., and well solved the problem of small reserved corridor width. At present, the composite cross-arm is showing a rapid development trend in our country, and has a wide application prospect in the future. In order to optimize the overall performance of the new composite cross-arm, and to be able to run on the net for a long time, it is necessary to cons...

AI Technical Summary

Problems solved by technology

[0003] Because the amplitude of the breeze vibration is very small, it is difficult to be found in routine inspections, which leaves a serious safety hazard for the composite crossarm installed with overhead wires that has been operating under the condition of breeze vibration for a long time

After continuous breeze vibration, fatigue of the wire material and the cross-arm composite insulation material (ie, fretting fatigue) will suddenly cause strand breakage or wire breakage during a certain gallop or sub-gap vibration, or even when there is no galloping or sub-gap vibration Under such conditions, major accidents such as sudden strand breakage and disconnection occurred, which seriously affected people's life and production.

The operating experience of overhead transmission lines at home and abroad shows that: overhead conductors operating in deserts, valleys, river valleys, coasts and other terrain conditions are prone to severe breeze vibrations, and overhead conductors without any protective measures may be damaged within two weeks. Fretting leads to fatigue and broken strands, which not only greatly increases the power loss of the transmission line, wastes power resources, but even leads to broken wires after multiple strands break, which leads to power outages and seriously affects the safety of transmission lines.

In addition, it is estimated that the cost of overhead conductors and cross-arm facilities accounts for about 80% of the entire transmission line, so the replacement of accidental overhead conductors will be a huge investment

At present, a lot of research has been carried out on wind vibration at home and abroad. The principle of energy balance is generally used to evaluate the vibration of conductors abroad. However, the complexity of wind vibration makes the numerical analysis method unable to be well applied in practice.

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