首先人工模拟了变压器绕组辐向变形、联合变形、匝间短路等几种典型的绕组故障,然后通过脉冲响应的方法,得到不同故障下的频率响应曲线,提取谐振点信息,分频段计算其频率响应曲线之间的相关系数和欧式距离,总结了不同故障下频率响应曲线的差异.结果表明:当绕组发生机械性位移时,故障前后频率响应曲线的相关性比较明显,相关系数可达0.7;与绕组辐向变形和联合变形相比,绕组短路故障谐振点的幅值变化不明显,但在4~6 MHz高频区域的频率变化较为明显.利用方波脉冲构建的频率响应曲线可以对多种绕组故障进行检测分析.
Typical types of winding faults, including radial deformation, combined deformation, turn-to-turn short circuit, were simulated artificially, then the frequency response curves under different faults were obtained by impulse response method. The information of resonance points was extracted, and the correlation coefficient and Euclidean distance of frequency response curves were calculated. The differ-ences of frequency response curves under different faults were summarized. The results show that when the winding has mechanical displacement, the correlation of frequency response curves before and after fault is obvious, and the correlation coefficient reaches 0.7. Compared with the radial deformation and combined deformation, the amplitude of resonance points in the frequency response curve of turn-to-turn fault does not change apparently except at the higher frequency range (4~6 MHz). The frequency re-sponse curves obtained by square-wave pulse can detect and analyze different kinds of winding faults.
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