Cable termination is a weak point in an underground cable system. The transient earth voltage (TEV) method is an effective and nonintrusive method for estimating the insulation condition of cable termination. However, the practical application of TEV detection is mainly focused on switchgears, generators, and transformers with a flat and conductive shell. A flexible sensor array based on the TEV method is presented for online partial discharge (OLPD) monitoring of the cable termination. Each sensing element is designed with a dual-capacitor structure made of flexible polymer material to obtain better and more stable sensitivity. Based on the electromagnetic (EM) wave propagation theory, the partial discharge (PD) propagation model in the cable termination is built to analyze and verify the rationality and validity of the sensor unit. Some influencing factors are discussed regarding the response characteristics of sensors. Finally, the performance of the sensor array is verified by simulations and experiments. Besides, an OLPD monitoring system is introduced. The monitoring system is composed of the on-site monitoring device and the remote monitoring host. The two parts of the system exchange the data through wireless networks using a wireless communication module. The experiment results show that the monitoring device could supply the PD condition monitoring demand for cable termination.

中文翻译：

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基于瞬态地电压的灵敏传感器阵列，用于电缆端接的在线局部放电监测

电缆端接是地下电缆系统的薄弱环节。瞬态接地电压（TEV）方法是一种有效且非侵入性的方法，用于估算电缆端接的绝缘状况。然而，TEV检测的实际应用主要集中在具有平坦且导电外壳的开关设备，发电机和变压器上。提出了一种基于TEV方法的灵活传感器阵列，用于对电缆端接进行在线局部放电（OLPD）监控。每个传感元件都设计有由柔性聚合物材料制成的双电容器结构，以获得更好，更稳定的灵敏度。基于电磁波传播理论，建立了电缆端接中的局部放电（PD）传播模型，以分析和验证传感器单元的合理性和有效性。讨论了有关传感器响应特性的一些影响因素。最后，通过仿真和实验验证了传感器阵列的性能。此外，还引入了OLPD监控系统。监控系统由现场监控设备和远程监控主机组成。系统的两个部分使用无线通信模块通过无线网络交换数据。实验结果表明，该监测装置能够满足对电缆端接的局部放电状态监测需求。监控系统由现场监控设备和远程监控主机组成。系统的两个部分使用无线通信模块通过无线网络交换数据。实验结果表明，该监测装置可以满足对电缆端接的局部放电状态监测需求。监控系统由现场监控设备和远程监控主机组成。系统的两个部分使用无线通信模块通过无线网络交换数据。实验结果表明，该监测装置可以满足对电缆端接的局部放电状态监测需求。