Taking into account the characteristic of the high-voltage transmission line, this paper discusses the basic principle of the eddy current testing method.

结合高压输电线的特点，在论述了电涡流检测方法的基本原理之后，进一步论述了差动式检测线圈的电涡流检测原理与方法。

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Considering problem of the leading electrode of the Locomotive traction motor crack flaw, the eddy current testing method for leading electrode crack defect is researched in the paper.

针对机车牵引电机主极裂纹问题，本文深入地研究了用电涡流方法实现对主极裂纹检测的问题。

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