What is the cause of the generator rotor insulation is lower?

1:rotor insulation resistance due to be affected with damp be affected with damp is reduced to below the allowable values,such as generator outage time is longer,environment humidity causes such as lower insulation resistance.2:the rotor due to long service life,or in the operation of electric motor cooling fan a variety of reasons caused by overheat the rotor coil insulation aging magnet prices and deterioration.3:under the slip ring with carbon brushes powder or oil accumulation,make rotor lead www.dongfeng-motor.com wire insulation damage.

4:untight seal or as a result of the generator cooling system because of its bearing oil make the rotor winding end dust,oil pollution or carbon powder,which reduces the insulation performance. The reasons are greatly influenced by the rotor of the centrifugal force.5:because in the operation of the ventilation and the effect of thermal expansion,the trough line on the rotor slot coating aging,breaking off or even fall single phase capacitor start induction motoroff,make the slit groove line on mica flake,fracture was blown off plus noth factors such as sulphuric acid.6:rotor slot insulation faults caused low rotor insulation resistance grounding or gold attribute.