Partial discharge location using a hybrid transformer winding model with morphology-based noise removal
Partial discharge location using a hybrid transformer winding model with morphology-based noise removal
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DOI：
10.1016/j.epsr.2013.03.003
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发表时间：
2013-08
影响因子：
3.9
通讯作者：
T. Ji;W. Tang;Qinghua Wu
中科院分区：
文献类型：
--
作者：
T. Ji;W. Tang;Qinghua Wu
本文采用混合模型的电力Transformer绕组的局部放电（PD）的准确定位。该混合模型大大降低了多导体传输线（MTL）模型的计算复杂度，但保留了准确表示绕组的能力。在得到混合模型的传递函数后，可以从一组检测点处的线端和中性端计算局部放电信号。随后，比较所计算的信号对，并且在检测到两个信号的最小归一化欧几里得距离或F比的点处定位PD。为了提高计算效率，提出了一种两轮技术，即粗轮和精轮，并给出了一种分区准则。还考虑了测量设备引入的噪声的影响。为了在去除噪声的同时保留特征波形，采用了自适应形态滤波器。仿真研究表明，即使存在高斯噪声，利用混合模型进行局部放电定位也是准确可行的。
This paper employs a hybrid model of a power transformer winding for accurate partial discharge (PD) location. The hybrid model greatly reduces the computation complexity of the multi-conductor transmission line (MTL) model, yet retains the ability to accurately represent a winding. Having obtained the transfer functions of the hybrid model, PD signals can be calculated from both line-end and neutral-end at a set of detecting points. Subsequently, the pairs of the calculated signals are compared and a PD is located at the point where the minimum normalized Euclidean distance or F-ratio of the two signals is detected. In order to enhance computation efficiency a two-round technique, which includes a coarse round and a precise round, is developed and a guideline for section division is given. The influence of noise introduced by measurement devices has also been considered. To reduce the noise meanwhile preserve the feature waveforms, an adaptive morphological filter is employed. Simulation studies have shown that it is accurate and feasible to perform PD location using the hybrid model even with the presence of Gaussian noise.