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基于时间-功率比图谱的射频局部放电测量中的源分离。

Separation of sources in radiofrequency measurements of partial discharges using time-power ratio maps.

机构信息

Department of Electrical Engineering, Universidad Carlos III de Madrid, Leganés -28911, Spain.

Department of Electrical Engineering, Universidad Técnica Federico Santa María, Santiago de Chile, Chile.

出版信息

ISA Trans. 2015 Sep;58:389-97. doi: 10.1016/j.isatra.2015.04.006. Epub 2015 May 18.

DOI:10.1016/j.isatra.2015.04.006
PMID:25997372
Abstract

Partial discharges measurement is one of the most useful tools for condition monitoring of high-voltage (HV) equipment. These phenomena can be measured on-line in radiofrequency (RF) with sensors such as the Vivaldi antenna, used in this paper, which improves the signal-to-noise ratio by rejecting FM and low-frequency TV bands. Additionally, the power ratios (PR), a signal-processing technique based on the power distribution of the incoming signals in frequency bands, are used to characterize different sources of PD and electromagnetic noise (EMN). The calculation of the time length of the pulses is introduced to separate signals where the PR alone do not give a conclusive solution. Thus, if several EM sources could be previously calibrated, it is possible to detect pulses corresponding to PD activity.

摘要

局部放电测量是高压 (HV) 设备状态监测最有用的工具之一。这些现象可以通过射频 (RF) 传感器在线测量，本文中使用的 Vivaldi 天线就是一个例子，它通过拒绝 FM 和低频电视频段来提高信噪比。此外，功率比 (PR) 是一种基于频带中输入信号功率分布的信号处理技术，用于表征不同来源的局部放电和电磁噪声 (EMN)。引入脉冲时间长度的计算是为了分离仅 PR 不能给出明确解决方案的信号。因此，如果可以预先校准几个 EM 源，就有可能检测到对应于 PD 活动的脉冲。

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