基于暂态热路模型及反演算法的电缆接头导体温度监测

摘要

对电缆接头温度进行实时监测对于预防电缆接头的热致事故是十分重要的，但传统的基于精确热网络模型的温度反演算法实现难度非常大。建立了计入电缆接头分布式热容的暂态热路模型，并据此推导出电缆接头导体温度反演算法。同时，利用仿真软件模拟各种负荷状态下电缆接头温度的变化，为电缆接头温度反演算法的研究提供技术手段。通过实验室模拟，证实了所提出的监测方法的有效性。%It is very important to monitor the temperature of cable joint conductor for preventing its thermal faults, but the traditional inversion algorithm of cable joint conductor temperature based on accurate thermal model is hard to realize.This paper establishes a transient thermal circuit model which included distributed heat capacity of cable joint, and based on the model derives an inversion al-gorithm of the cable conductor temperature.In addition, the temperature change of cable joint under various loads is simulated with a simulation software to provide technique means for the inversion algorithm research.The effectiveness of the proposed monitoring method is verified thorough simulations in laboratory.