A novel combined in-oil PD sensor with AE and UHF methods for PD detection in transformer, part 1: structural design and development

2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE) Pub Date : 2020-09-06 DOI:10.1109/ICHVE49031.2020.9279737

W. Si, X. Huang, Zheng Zhu, B. Wei, L. Su, P. Yuan

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Abstract

According to the disadvantages and advantages of electromagnetic and acoustic partial discharges (PD) measurements shown in IEC TS 62478 Edition 1.0 2016–08, a combined in-oil PD sensor with acoustical emission (AE) and Ultra high frequency (UHF) methods for PD detection in transformer is designed and developed in this paper. It is formed by placing an AE sensor inside the end part of UHF probe, and can be mounted on the oil valve, pushed inside the transformer to measure the acoustic and electromagnetic signals from PD simultaneously. The structure design of a combined UHF/AE in-oil PD sensor considering signals coupling and oil sealing are given in detail, with AE sensor and UHF antenna working independently of each other based on two output channels to avoid the application of different bandwidth hardware filters. Tests of discharges in air show that the novel combined UHF/AE in-oil PD sensor designed and developed can couple the electromagnetic and acoustic signals generated by discharge pulse at the same time effectively.

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一种结合声发射和超高频方法的变压器局部放电检测油内传感器，第一部分:结构设计与开发

根据IEC TS 62478 version 1.0 2016-08中电磁和声局部放电(PD)测量方法的优缺点，设计并研制了一种结合声发射和超高频(UHF)方法的油内局部放电传感器，用于变压器局部放电检测。它是在UHF探头的端部放置一个声发射传感器形成的，可以安装在油阀上，推入变压器内部，同时测量PD发出的声和电磁信号。详细介绍了考虑信号耦合和油封的UHF/AE油内PD传感器的结构设计，AE传感器和UHF天线基于两个输出通道相互独立工作，避免了不同带宽硬件滤波器的应用。空中放电试验表明，所设计研制的新型超高频/声发射组合油内PD传感器能够有效地将放电脉冲产生的电磁信号和声信号同时耦合起来。

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2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)

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