High-capacity synchronous generator grounding detection device

The utility model relates to a grounding detection device of large capacity synchronous generators, which is mainly characterized in that a collecting ring component arranged on the rear end of a rotating shaft of a generator rotor is composed of a collecting ring stent with a grounding ring, a collecting ring molded to be a whole with the collecting ring stent through an insulation element, and a conductive connector installed on the collecting ring. A brush in sliding contact with the collecting ring and the grounding ring is installed on a cantilever strut fixed on an end plate of a shield. The brush is connected to a junction box on the outside of the shield end plate through a wire. The device has the advantages of rational design, compact sleek design, safe and reliable operation, simple production process with the raw material consumption saving, the easy installation and maintenance as well as the small floor space.