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2. 发明公开

EP3264112A1 METHOD FOR DETECTING A DC MAGNETIC BIAS IN TRANSFORMER 有权转让
标题翻译：在变压器中检测直流磁偏置的方法
公开(公告)号：EP3264112A1
公开(公告)日：2018-01-03
申请号：EP17179000.9
申请日：2017-06-30
申请人： Siemens Transformer Company Ltd.
发明人： LI, Lin Da , FAN, Xing Hua , SI, Dai Jun
IPC分类号： G01R31/02
CPC分类号： G01R31/027
摘要： The present invention relates to a method for detecting DC magnetic bias in a transformer, comprising the following steps: a signal acquisition step (S52), a signal processing step (S54) and a determination step (S56). The signal acquisition step consists of acquiring a vibration signal of an oil tank of the transformer. The signal processing step comprises: forming a time domain waveform of the vibration signal (S542); subjecting the time domain waveform to frequency domain decomposition, to convert the time domain waveform into a frequency domain waveform (S544); calculating an amplitude of each odd number frequency and an amplitude of each even number frequency of the frequency domain waveform (S546). The determination step is as follows: if the amplitude of an odd number frequency is greater than half of the amplitude of an even number frequency, then there is DC magnetic bias in the transformer.
摘要翻译：包括以下步骤：信号获取步骤（S52），信号处理步骤（S54）和确定步骤（S56）。本发明涉及用于检测变压器中的直流偏磁的方法。信号采集步骤包括获取变压器油箱的振动信号。信号处理步骤包括：形成振动信号的时域波形（S542）; 对时域波形进行频域分解，将时域波形转换为频域波形（S544）; 计算每个奇数频率的幅度和频域波形的每个偶数频率的幅度（S546）。确定步骤如下：如果奇数频率的幅度大于偶数频率幅度的一半，则在变压器中存在直流偏磁。

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