谐波制动原理防止励磁涌流误动的改进措施

目前，国内保护原理大部分采用二次谐波制动原理，该原理是目前最成熟、运用最广泛的防止励磁涌流的方法，但是在实际运用中还存在一些问题。文章结合实际，分析了励磁涌流导致差动保护误动作的原因，介绍了目前国内对这一问题研究的最新进展及二次谐波原理的改进方法，并分析了这些方法的特点和在现场中的实际运用情况。

Corrective Measure of Preventing False Tripping of Excitation Surge Current on the Basis of the Principle of Harmonic Restraining

At the point, second harmonic escapement is wildly used as protection principles in China, which is the most relevant and popular harmonic excitation system, however, some problems exist in practical operation. In this regard, the article reasons the rationale behind false tripping of excitation surge current, introduces the latest development of the issue domestically, the corrective measures and analyzes their features and the practical applications.