Fault diagnosis method and device for transformer station grounding network

The invention relates to a fault diagnosis method and device for transformer station grounding network. The method comprises the following steps of: 1, selecting a grounding state parameter test pointof a specific grounding down lead of the transformer station grounding network; 2, connecting a field arbitrary wave current signal combination generator, selecting a representative grounding down lead at a different location of the grounding network as a voltage response output terminal, and connecting the voltage response output terminal to a high-frequency data acquisition device; 3, obtainingthe frequency response process curves of the representative grounding down leads at different locations of the grounding network; 4, subjecting the curves to the combined correlation coefficient analysis; and 5, evaluating the running status of the grounding network according to a result of the combined correlation coefficient analysis. Compared with the prior art, the fault diagnosis method hasthe advantages of ensuring the safe and reliable operation of a power system, being simple, accurate, and not limited by field operating conditions.