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基于全相位傅里叶变换的磁调制交直流漏电电流检测方法

, PP. 254-260

Keywords: 全相位傅里叶变换,磁调制,交直流电流,漏电检测

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Abstract:

电力电子设备发生漏电故障时,其漏电电流为交直流复合的复杂电流信号,传统的电磁式电流检测方法、霍尔电流检测方法或双铁心磁调制电流方法均无法满足复杂漏电电流的检测要求。针对这一问题,提出一种基于全相位傅里叶变换的磁调制交直流漏电电流检测方法,采用电压型单铁心磁调制互感器进行交直流漏电电流检测,可以简化互感器结构;同时采用全相位傅里叶变换进行磁调制电流解调,可以简化解调电路结构。试验结果表明,全相位傅里叶变换有效克服了非周期采样造成的频谱泄漏问题,从而使互感器具有较高的检测准确度。

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