Application of Time Frequency Characteristics of Gas Spectrogram for State Diagnosis of Bushing

Dandan Han, L. Zhang, Ying Zheng
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Abstract

To effectively diagnose the defects of oil impregnated paper insulation bushing by using the result of dissolved gas analysis, the gas spectrum is constructed by using the relative content of dissolved gases in oil. The equivalent time length Teq and equivalent frequency band width Feq are extracted as the characteristic parameters of gas spectrum, and are used to cluster and separate the gas spectrum of different defects. Based on that, the time-frequency eigenvalue boundary for identifying different bushing defects is constructed, and the bushing state diagnosis method based on the time-frequency characteristics of spectrum is proposed according to the distribution results of the Teq - Feq graph. Finally, the diagnosis effect of time-frequency spectrum method and Duval triangle method is compared and analyzed, and the effectiveness of spectrum time-frequency feature in bushing defect diagnosis is verified by disassembly visual inspection. The results show that the time-frequency characteristics of spectrum can effectively diagnose the state of bushing, and its diagnostic accuracy is due to Duval triangle method, and it can make up for the defects of Duval triangle method in misjudging or difficult to judge the normal state of bushing, which can be used as an important basis for the state diagnosis of oil impregnated paper insulated bushing.
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气相频谱时频特性在衬套状态诊断中的应用
为了利用溶解气体分析结果有效诊断油浸纸绝缘套管的缺陷,利用油中溶解气体的相对含量构建了油浸纸绝缘套管的气相谱。提取等效时间长度Teq和等效频带宽度Feq作为气谱特征参数,用于对不同缺陷的气谱进行聚类和分离。在此基础上,构造了识别不同衬套缺陷的时频特征值边界,并根据Teq - Feq图的分布结果,提出了基于谱时频特征的衬套状态诊断方法。最后,对比分析了时频谱法和杜瓦尔三角法的诊断效果,并通过拆装目视检测验证了谱时频特征在轴套缺陷诊断中的有效性。结果表明,谱的时频特性能有效诊断衬套状态,其诊断精度得益于杜瓦尔三角法,弥补了杜瓦尔三角法误判或难以判断衬套正常状态的缺陷,可作为油浸纸绝缘衬套状态诊断的重要依据。
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