Method for direct current grounding electrode line fault distance measurement through intersecting line positioning of direct current component and harmonic component

The invention relates to a method for direct current grounding electrode line fault distance measurement through intersecting line positioning of a direct current component and a harmonic component and belongs to the technical field of electric system distance measurement. The method comprises the steps that when a grounding electrode line breaks down, a grounding electrode lead measurement end voltage direct current component and direct current components of two returning outgoing line currents are respectively measured in real time, a function relationship between fault distance and transition resistance is obtained through a direct current component method, a function relationship between the fault distance and transition resistance is obtained through a harmonic component method, and the fault point position satisfying the two function relationships at the same time is determined according to a function relationship curve of the direct current component and a function relationship curve of the harmonic component. According to the method for direct current grounding electrode line fault distance measurement through intersecting line positioning of the direct current component and the harmonic component, single-ended information content of a line is used, the principle is simple, the sampling rate is low, and the method is convenient to achieve; the direct current component and the harmonic component are combined, certain interference resistant capacity is achieved, and the method is slightly influenced by the transition resistance.