矿用XLPE电缆老化状态对温升的影响

通过分析电缆绝缘参量的温度效应和老化特征,明确运行中矿用高压电缆的介质损耗不可忽略,并据此建立了老化对在役矿用XLPE电缆温升影响的评估方法.根据单芯电缆温升计算式,给出了兼顾老化因素的三芯电缆温升解析式,进行稳态温升预测.基于导体损耗的温度正相关性,利用ANSYS有限元仿真软件,建立热电耦合迭代模型来确认理论模型,并对电缆温升进行仿真计算.算例对比分析了老化电缆水树附近和老化电缆整体的温升,为实际运行中电缆的状态监测提供参考依据.

Impact on temperature rise of mining XLPE cable under aging condition

Based on the analysis of temperature effect and aging characteristics of cable insulation parameters, it can be concluded that the dielectric loss of high voltage mining cable should not be neglected, and therefore an assessment method for the temperature rise of the mining XLPE cable in service considering the aging factor is established. The procedure to calculate the temperature rise of the three-core cable involving the aging factor is put forward by extending the single-core cable model to handle such problems. In addition, a XLPE cable thermal-electromagnetic coupling model due to the power loss＇ s dependence on the temperature is built by the ANSYS finite-element analysis software. The model is adopted to test the validity of the analytic procedures, and simultaneously simulate the temperature of mining XLPE cable. By employing the models mentioned above, the temperature rises are compared between the whole aging cable and the partial water tree region, which offers decision for monitoring of aging cable.