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Method and device for evaluating the durability of a composite insulating cross arm

A technology of composite insulation and insulating cross-arm, applied in the field of electric power, can solve the problems of lack of dynamics and durability design methods

Active Publication Date: 2019-06-21
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The safety calculation and evaluation of the composite cross-arm is only at the level of statics and strength design, lacking dynamics and durability design methods

Method used

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  • Method and device for evaluating the durability of a composite insulating cross arm
  • Method and device for evaluating the durability of a composite insulating cross arm
  • Method and device for evaluating the durability of a composite insulating cross arm

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Embodiment Construction

[0059] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0060] Such as figure 1 As shown, the composite insulation cross-arm durability evaluation method of the present invention comprises steps:

[0061] (1) Perform finite element analysis on the stress response of the composite insulating cross-arm under static load to find the key section for durability performance evaluation; the specific steps are as follows:

[0062](1.1) Establish the finite element model of the composite insulating cross-arm; the connection between the composite insulating cross-arm and the utility pole can usually be regarded as a fixed connection, and the connection of the remaining nodes can be designed as a fixed connection or a hinged connection according to the actual situation by means of node coupling. Generally, space beam elements are used for simulation;

[0063] (1.2) The straight part and the brace part of...

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Abstract

The invention discloses a method and device for evaluating the durability of a composite insulating cross arm, and the method comprises the steps: carrying out the finite element analysis of the stress response of a composite cross arm under the action of a static load, and finding a key cross section for durability evaluation; for three key load factors influencing the service durability of the composite cross arm, namely a broken line load, conductor galloping and breeze vibration, adopting different evaluation strategies for evaluation; for the line breaking working condition, applying a line breaking load to the cross arm, acquiring the dynamic stress response of the key section, calculating the impact coefficient and evaluating safety; selecting a standard load block of galloping andbreeze vibration, carrying out dynamic analysis on a cross arm under the action of conductor galloping and breeze vibration to obtain a dynamic stress response of a key section, and carrying out fatigue life evaluation. According to the method, the durability of the cross arm under the combined action of various loads can be evaluated, the nonlinear development process of damage can be reflected,and the method is accurate and reliable compared with a traditional estimation method.

Description

technical field [0001] The invention belongs to the field of electric power, in particular to a method and device for evaluating the durability of a composite insulating cross-arm. Background technique [0002] Resin and glass fiber composite materials have many advantages in terms of electrical and mechanical properties. At present, it is a trend for composite insulating cross-arm towers to replace all-steel towers. [0003] At present, composite material crossarms are mainly used in transmission lines with lower voltage levels of 220kV and below in China, and the material strength method of static load is used for design and safety check; however, there are few applications for ultra-high voltage transmission lines of 500kV and above. The main reason is that the safety, durability and long-term reliability requirements of high-voltage transmission lines are higher. The main obstacle hindering the application of composite cross-arms to high-kilovolt transmission lines is t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 贾勇勇吴佰建付慧戴建卓郭小明张廼龙
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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