Full life cycle cost estimation method for cable line steel bracket based on thermal fatigue

Abstract

Provided is a full life cycle cost estimation method for a cable line steel bracket based on thermal fatigue. Finite element numerical calculation of electromagnetic fields, flow fields and temperature fields of cable lines is conducted, the loss of induced loop on the steel bracket is obtained, the temperature change of the steel bracket is obtained, the cyclic change thermal stress caused by thetemperature change is obtained, and the fatigue life limit of the steel bracket is calculated according to thermal fatigue analysis. Then, a full life cycle cost model of the cable steel bracket is established, the parameters in the model include the operating cost which is the same as the steel bracket vortex loss calculated by the electromagnetic fields, and the thermal fatigue life limit is taken as the full life cycle. Finally, aiming at the whole process of construction, operation, maintenance and retirement of the cable lines, the increased operating cost brought by vortex loss and thereduced fatigue life caused by thermal fatigue which leads to change of full life cycle service limit are taken as influencing factors, the factors are combined, a life cycle cost theory is used for evaluating the economy of the cable lines, and a novel idea and a theoretical basis are provided for the design and model selection of the cable line steel bracket.

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

Images