Cable group cable core transient temperature calculation method based on finite element method

Abstract

The invention provides a cable group cable core transient temperature calculation method based on a finite element method. The method includes the steps of firstly, checking the cable group laying condition, secondly, measuring relevant parameters of cables, thirdly, building a model for a cable group according to measured data, fourthly, dividing the cable model, fifthly, reading currents and determining alternating current resistance and thermal loads, sixthly, conducting simultaneous solution on all division units, and seventhly, repeatedly executing the fifth step and the sixth step, and repeatedly conducting iteration to get a cable core transient temperature. The cable group cable core transient temperature calculation method plays a significant role in solving the problem of cable core temperature when multiple cables are used at the same time under a complex laying condition, real-time temperature of cable cores can be accurately calculated, and judgment of the real-time operating state of cables can be facilitated.

Description

technical field [0001] The invention belongs to the field of cable temperature evaluation of power cable equipment, and in particular relates to a method for calculating transient temperature of cable group cores based on finite element method. Background technique [0002] Underground cables have the advantages of not occupying ground space, being less affected by natural weather conditions, high power supply reliability, and low operation and maintenance costs, and are currently widely used in power transmission and distribution systems. If the ampacity of the cable is set too high, the working temperature of the cable core will exceed the allowable value, which will shorten the life of the cable or even cause a fire; Necessary waste. Real-time monitoring of the transient temperature of the cable during operation can maximize its ampacity while ensuring the safety of the power cable. [0003] In the existing research, the IEC-60853 standard proposes a calculation method ...

AI Technical Summary

Problems solved by technology

In the actual site, the laying conditions are complex and the environmental conditions are changeable. It is obviously not enough to use the same empirical formula uniformly, and other methods for determining the transient temperature of the cable core are mainly focused on improving on the basis of the IEC-60853 standard. Research on the situation of multiple cables and load current changes is still shallow

[0004] In short, the existing evaluation standards and methods for cable core temperature have shortcomings such as narrow application range, insufficient scalability, and inaccurate temperature calculation due to simultaneous operation of multiple cables.

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