A new transformer protection principle based on two-instantaneous-value-product algorithm to extract the feature of fundamental current amplitude is put forward in this paper.
提出了一种基于两采样值积算法快速提取基波幅值变化特征的变压器保护新原理。
This is a single-phase measurement that multiplies the amplitude of fundamental current of a line by a sine signal which has the same phase with the current.
此方法属于单相检测法，先提取电网电流中的某相基波幅值，再将基波幅值乘以与该相电流同相位的正弦波，从而得出该相的瞬时基波电流。
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