寻找最佳声发射传感器阵列定位电力变压器局部放电源的方法

Shao-Rui Qin, Yan-Bo Wang, G. Ding, Taiyun Zhu, Jianlin Li, Guanjun Zhang
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引用次数: 1

摘要

局部放电是电力变压器绝缘失效的主要原因。有效、准确地定位变压器局部放电源对绝缘维护具有十分重要的意义。声发射(AE)方法因其具有优异的抗电磁干扰能力和安装方便等优点而受到研究人员的关注。许多研究人员使用多个声发射传感器阵列来采集PD信号,并利用信号之间的时间差来定位PD源。但是,如果传感器布置不合理,必然会在时差估计中引入巨大的误差。本文简要介绍了声发射信号的传播特性和到达时间差法的基本原理。然后,本文介绍了如何建立变压器物理模型,提出了一种优化超声波传感器阵列布置的方法,以更好地定位变压器局部放电功率。将该算法应用于35kV变压器两平面传感器阵列的优化设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Methodology of Searching the Best AE Sensor Array to localize PD sources in Power Transformer
The partial discharge (PD) is the main cause of the insulation failure in power transformers. Localization of the partial discharge source in the transformer effectively and precisely has a very important meaning in the insulation maintenance. The acoustic emission(AE) method has attracted researchers' attention because AE sensors have excellent ability to resist electromagnetic interference and they are convenient to be installed. Many researchers use an array of multiple AE sensors to collect PD signals and use the time difference between the signals to localize the PD source. However, if the sensor arrangement is unreasonable, it will inevitably introduce a huge error in time difference estimation. In this paper, the propagation characteristics of AE signals and the basic principles of time-difference-of-arrival (TDOA) methods are briefly introduced. After that, this paper describes how to set up a transformer physical model proposes a method of optimizing the arrangement of ultrasonic sensor arrays to better localize the partial discharge power in transformers. The algorithm is used to optimize the sensor array on two planes of a 35kV transformer.
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