METHOD FOR DYNAMICALLY DETERMINING OPTIMAL NUMBER OF INSULATING LAYERS IN TRANSIENT THERMAL PATH OF HIGH-VOLTAGE CABLE

摘要

A method for dynamically determining an optimal number of insulating layers in a transient thermal path of a high-voltage cable, comprising the following steps: S1, choosing a high-voltage cable needed; S2, building a transient thermal path model and corresponding mathematical model of the cable body; S3, determining each parameter in the models; S4, editing a calculation program in the mathematical model in S1; S5, importing each model parameter, calculating a temperature value of a conductor in different numbers of layers at the same moment, and solving a change rate of the conductor temperature along with the number of layers, wherein when the change rate reaches a lower limit of a set change rate, the number of layers at this time is the optimal number of layers; S6, determining the optimal number of insulating layers at the next moment based on a calculation result in S5; and S7, repeating S5 and S6 to obtain a real-time optimal number of of insulating layers in a transient thermal path of the high-voltage cable. By means of the method, a better transient thermal path model can be obtained, and the model has a real-time correction property, laying an important foundation for accurate calculation of the carrying capacity of a cable.