Research on Insulation Resistance Reduction and Repair Technologyof DC Reactors

An effective analysis was conducted on the fault of the insulation resistance value of the industrial frequency DC reactor being below the specified value during the maintenance of the auxiliary converter in the subway project. Repair and preventive measures were proposed to address the upcoming large-scale overhaul and maintenance tasks for auxiliary converters. By constructing a fault analysis tree and a repair flowchart, the fault was systematically analyzed. Specific cleaning methods and re-painting processes were implemented, and the repair effectiveness was ultimately verified through acceptance tests. This strategy effectively resolved the insulation fault issue of the reactor and is also applicable to other industrial frequency magnetic components such as transformers and AC reactors in converters, providing significant reference and guidance for the overhaul and maintenance of auxiliary converters.