Abstract: Bearing current issue is one of the most troubling for DFIG wind turbine operating and maintenance. The multiple technical measures attempting to solve the problem are all centered on the would-rotor generator, which may yield one reason why there is still no root-cause-based solution. This paper tries to analyse the paths of bearing current from the perspective of galvanic systems to find other possibility of blocking up bearing passage through. With references on onshore power supply for marine vessels, common-mode voltage suppression for MV AC drives and thermal power plant auxiliary power wiring, a grounding type suggestion is presented to tackle the bearing current issue.