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Abstract

A method and a device for limiting secondary arc current of an extra-high voltage/ultra-high voltage double circuit line on the same tower. The method comprises the following steps: determining the type of a single-phase-to-ground fault when the extra-high voltage/ultra-high voltage double circuit line on the same tower has a single-phase-to-ground fault (S501); selecting a reactance value of a neutral grounding reactor according to the type of the single-phase-to-ground fault (S502); and switching the extra-high voltage/ultra-high voltage double circuit line on the same tower to the selected reactance value of the neutral grounding reactor (S503). Thus the reactance value of the neutral grounding reactor is not constant, but is changed along with the operating conditions of the power transmission line, that is, the reactance value of the neutral grounding reactor is controllable. In this way, when the operating conditions of the extra-high voltage/ultra-high voltage double circuit line on the same tower are different, a neutral grounding reactor with an optimal reactance value can be selected so as to be accessed to the power transmission line, thereby effectively limiting the secondary arc current caused by the single-phase-to-ground fault.

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