A life-cycle cost assessment method for cable line steel support based on thermal fatigue

Abstract

A life-cycle cost assessment method for cable line steel brackets based on thermal fatigue. The electromagnetic field, flow field, and temperature field of the cable line in the cable tunnel are calculated using finite element elements to obtain the loss of induced eddy currents on the steel bracket and the temperature of the steel bracket. The change and the thermal stress of the cyclical change caused by it are calculated according to the thermal fatigue analysis to obtain the fatigue life of the steel bracket. Then, the whole life cycle cost model of the cable steel support is established. The parameters in the model include the eddy current loss of the steel support calculated by the electromagnetic field as the operating cost, and the thermal fatigue life is taken as the life cycle of the whole life cycle. Finally, for the entire process of cable lines from construction, operation, maintenance to decommissioning, the increase in operating costs caused by eddy current loss, the decrease in fatigue life caused by thermal fatigue and the change in the service life of the entire life cycle are taken as influencing factors, and these factors are combined and applied The life-cycle cost theory evaluates the economics of cable lines, and provides a new idea and theoretical basis for the design and selection of support for cable lines.

Description

technical field [0001] The invention relates to a thermal fatigue-based life-cycle cost evaluation method for a steel support of a cable line, which relates to the research fields of power transmission line engineering and mechanical fatigue life. Background technique [0002] In recent years, because the power cable system meets the needs of resource conservation and environmental friendliness, the power cable transmission system has been vigorously developed. In order to achieve greater transmission capacity and longer transmission distance, people continue to increase the voltage level of cable lines, and at the same time, in order to enhance the safety and stability of the cable system, reduce the cost of cable production, installation and operation and maintenance, the technology of cables and their brackets keep improving. At present, in the cable tunnel, the cable line uses more supports made of steel materials, which are divided into several types such as angle stee...

AI Technical Summary

Problems solved by technology

However, the eddy current loss of the steel bracket only increases the operating cost of the cable line, the heating problem of the bracket caused by the eddy current loss, and the cable current changing with the load change will cause the temperature cycle of the bracket to change, and the resulting thermal stress will cause Fatigue damage of steel bracket affects its service life

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