Diesel Generator Tech

  Why is the insulation resistance of 200kw diesel generator reduced? Faults:  under thermal stability, insulation resistance of  200kw diesel generator  is lower than 0.5m Ω, lower than 2m Ω in cold state. Reason: 1)Diesel generator set is stored in humid environment or the alternator winding is affected by moisture during transportation. 2)During maintenance and cleaning working, the insulation of motor winding is damaged., or the insulation is damaged in the process of alternator overhaul and wire embedding. 3)Conductive dust in the surrounding air (e.g. metallurgical or coal industrial areas) or acid and alkaline vapors (such as chemical industrial areas) invade the alternator and corrode the alternator insulation. 4)Natural aging of generator winding insulation.   How to solve the reduction of insulation resistance of 200kw generator? 1)AC synchronous generator affected with damp must be dried, otherwise the generator may be burnt out due to insulation dama...