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For the large generators with different branch winding potential overlap, the existing stator ground fault location methods are difficult to determine the faulty branch. Therefore, this paper presents a novel fault location method based on the flexible optical current transformer. Based on the Faraday magneto-optical effect principle, the optical fiber reflection reciprocal interference technology is used to detect the rotation angle. The flexible optical current transformer is used to measure the equivalent zero-sequence current of each generator branch, and then the dynamic time warping distance (DTW) algorithm is used to compare the similarity of each zero-sequence current, to identify the correct faulty branch and achieve accurate grounding fault location. The simulation results verify the effectiveness of the proposed method, and the results are still reliable and sensitive when the transition resistance is 500 Ω.

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