Traction converter and state detection method, device of contactor of traction converter and equipment

The invention discloses a state detection method of a contactor in a traction converter. The state detection method comprises the following steps: acquiring opening and closing states of a normally closed auxiliary contact and a normally open auxiliary contact of the contactor; judging whether the opening and closing state of the normally closed auxiliary contact is matched with the opening and closing state of the normally open auxiliary contact or not; if so, determining a real opening and closing state of a main contact of the contactor; and if not, judging that the auxiliary contact of thecontactor has a false detection fault. The normally-open auxiliary contact and the normally-closed auxiliary contact of the contactor are detected at the same time, the false detection of the openingand closing state of the main contact can be avoided, and failure missed report and false report of the main contact and limited starting of a locomotive traction converter system after the failure missed report are further a