中文摘要：

大量非线性工业负荷在矿井配电网中的高度渗透使电力谐波对电缆的影响不可忽略,通过分析谐波引发的附加功率损耗,建立了谐波对矿用高压XLPE电缆容量和稳态温度影响的评估方法。定义额定容量降低因子,定量描述谐波引发的额外损耗导致的电缆载流量降低,并修订鉴幅式电流保护动作值。根据单芯电缆温升计算式,给出了兼顾谐波电流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,并对电缆温升和载流能力进行仿真计算。算例表明该研究为谐波环境下电缆的设计、选型、监测和保护提供有效决策依据。

英文摘要：

The impacts of electric harmonics on mining cables must be taken into account because of a large amount of non-linear industrial load in the power distribution system for a mine. An assessment method of impacts of harmonics on capacity and steady temperature of the mining high-voltage XLPE cable is established by analyzing the additional power loss caused by the harmonic current. Reduction factor of transmission capacity is defined to quantify the capacity reduction in the presence of harmonics, and to determine the activation value for triggering current protection. A formula of steady temperature rise involving the harmonics for three-core cable is put forward on the basis of the formula for single-core cable to predict steady temperature rise. Considering the positive dependence of the power loss on temperature, an electromagnetic-thermal coupling model of the XLPE cable is built with the finite element analysis software ANSYS. The model is adopted to validate the analytic procedures, and to simulate the temperature rise and capacity of the mining XLPE cable. Example shows that the proposed methods are efficient in design,type selection,monitoring, and protection of the mining XLPE cable under non-sinusoidal currents.