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Open AccessArticle

Flexible Sensor Array Based on Transient Earth Voltage for Online Partial Discharge Monitoring of Cable Termination

1
Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610000, China
2
College of Electrical Engineering, Sichuan University, Chengdu 610065, China
3
Electric Power Research Institute, Smart Grid Ningxia Electric Power Company, Yinchuan 750011, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(22), 6646; https://doi.org/10.3390/s20226646
Received: 28 October 2020 / Revised: 15 November 2020 / Accepted: 17 November 2020 / Published: 20 November 2020
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. View Full-Text
Keywords: partial discharge (PD); online partial discharge (OLPD) monitoring system; cable termination; transient earth voltage (TEV) partial discharge (PD); online partial discharge (OLPD) monitoring system; cable termination; transient earth voltage (TEV)
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MDPI and ACS Style

Zhao, M.; Cao, X.; Zhou, K.; Fu, Y.; Li, X.; Wan, L. Flexible Sensor Array Based on Transient Earth Voltage for Online Partial Discharge Monitoring of Cable Termination. Sensors 2020, 20, 6646. https://doi.org/10.3390/s20226646

AMA Style

Zhao M, Cao X, Zhou K, Fu Y, Li X, Wan L. Flexible Sensor Array Based on Transient Earth Voltage for Online Partial Discharge Monitoring of Cable Termination. Sensors. 2020; 20(22):6646. https://doi.org/10.3390/s20226646

Chicago/Turabian Style

Zhao, Mingshu; Cao, Xiaoyan; Zhou, Kai; Fu, Yao; Li, Xutao; Wan, Li. 2020. "Flexible Sensor Array Based on Transient Earth Voltage for Online Partial Discharge Monitoring of Cable Termination" Sensors 20, no. 22: 6646. https://doi.org/10.3390/s20226646

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