Optical Ultrasonic Detection for Partial Discharge Under Pulsed High Voltage

IF 5.6 2区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Instrumentation and Measurement Pub Date : 2024-10-18 DOI:10.1109/TIM.2024.3472790

Jun Jiang;Yaqian He;Yu Song;Qiang Wu;Qian Wang

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Abstract

Medium voltage power electronic transformer (PET), composed of power electronics modules and a high-frequency transformer (HFT), plays a significant role in the hybrid ac/dc distribution power grid, with renewable energy sources and electrified loads. Stressed by the high frequency, high voltage, and high temperature, the insulation of HFT is the weak point. However, it is difficult to get access to the discharge signal under severe electromagnetic interference (EMI) due to the fast-switching of the power electronics modules. An optical interference-based partial discharge (PD) detection is proposed and verified to evaluate the insulation status of HFT and PET. In this article, the method of detecting and extracting PD signals under high-voltage and high-frequency pulse waveform is studied by using a skeleton optical fiber sensor (OFS), Sagnac interference structure, and noncorrelation coefficient algorithm. The algorithm distinguishes PD activities from interference signals by analyzing the correlation of signals. The ultrasonic interference characteristics of frequency below 20 kHz and pulse voltage rise time above 50 ns are analyzed. The results demonstrate that the main frequency range of the disturbing signal is from 20 to 100 kHz, which overlaps with the frequency distribution of the PD signal. The noncorrelation coefficient between the signals is proportional to the PD strength. The PD signal is detected successfully on the HFT prototype. It is expected to provide a convenient approach to insulation detection and evaluation of high power, high frequency, and high voltage power apparatus.

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脉冲高压下局部放电的光学超声波探测

中压电力电子变压器（PET）由电力电子模块和高频变压器（HFT）组成，在具有可再生能源和电气化负载的交流/直流混合配电网中发挥着重要作用。受高频、高电压和高温的影响，高频变压器的绝缘是其薄弱环节。然而，由于电力电子模块的快速开关，在严重的电磁干扰（EMI）下很难获得放电信号。本文提出并验证了一种基于光干扰的局部放电（PD）检测方法，用于评估 HFT 和 PET 的绝缘状态。本文利用骨架光纤传感器 (OFS)、Sagnac 干涉结构和非相关系数算法，研究了在高压和高频脉冲波形下检测和提取局部放电信号的方法。该算法通过分析信号的相关性，从干扰信号中区分出 PD 活动。分析了频率低于 20 kHz 和脉冲电压上升时间高于 50 ns 的超声波干扰特性。结果表明，干扰信号的主要频率范围为 20 至 100 kHz，与 PD 信号的频率分布重叠。信号之间的非相关系数与 PD 强度成正比。在 HFT 原型上成功检测到了 PD 信号。它有望为大功率、高频率和高压电力设备的绝缘检测和评估提供一种便捷的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Instrumentation and Measurement 工程技术-工程：电子与电气

CiteScore

9.00

自引率

23.20%

发文量

1294

审稿时长

3.9 months

期刊介绍： Papers are sought that address innovative solutions to the development and use of electrical and electronic instruments and equipment to measure, monitor and/or record physical phenomena for the purpose of advancing measurement science, methods, functionality and applications. The scope of these papers may encompass: (1) theory, methodology, and practice of measurement; (2) design, development and evaluation of instrumentation and measurement systems and components used in generating, acquiring, conditioning and processing signals; (3) analysis, representation, display, and preservation of the information obtained from a set of measurements; and (4) scientific and technical support to establishment and maintenance of technical standards in the field of Instrumentation and Measurement.