This paper addresses the accelerated aging of medium-voltage (MV) cable terminations with resistive stress-grading due to supraharmonics. The paper introduces a simple and quick way to relate the risk of cable termination failure to the characteristics of supraharmonic distortion in the system. The motivation is to give practical recommendations and guidelines to evaluate the risk of failure of cable terminations under the presence of supraharmonics in MV networks. The underlying model relates the heating in the cable termination linearly with the frequency of the voltage applied and proportionally with the square of the magnitude of the voltage. The indicator can be used to decide whether given levels and frequencies of supraharmonics in the MV network represent a risk to cable terminations. The parameters of the cable termination design are not needed for that decision. However, the decision criterion is based on one sample data (Eagle Pass) and more field information is crucial to improve the approach.

中文翻译：

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超谐波电压导致的中压电缆终端故障：风险指标

本文讨论了由于超谐波引起的具有电阻应力等级的中压（MV）电缆端子的加速老化。本文介绍了一种将电缆端接故障的风险与系统中超谐波失真的特性相关联的简便方法。这样做的动机是提供实用的建议和指南，以评估在MV网络中存在超谐波的情况下电缆端接失败的风险。基本模型将电缆终端中的加热与所施加电压的频率线性相关，并与电压幅值的平方成比例。该指示器可用于确定MV网络中超谐波的给定电平和频率是否代表电缆终端的风险。该决定不需要电缆终端设计的参数。但是，决策标准基于一个样本数据（Eagle Pass），更多的现场信息对于改进该方法至关重要。