The superconducting Maglev system uses a long-stator linear synchronous motor (LSM) to drive trains. Propulsion coils are arranged along the guideway as the armature of the LSM and electrically divided into sections of a fixed length to improve the power factor and the efficiency of the LSM. If a ground fault occurs in a section, the fault section will be located immediately. However, the fault point in the section also needs to be located in order to recover the section as soon as possible. Therefore, the authors have developed a ground-fault locator for the Maglev power feeding system. This paper introduces the principle of fault location and examination results of the locator by artificial ground-fault tests performed at the Yamanashi Maglev Test Line.

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