Some advances in electrical diagnostic testing of generators and large A.C. motors

Reliable generation requires the early identification of defects occurring in service. This is best achieved through a planned programme of regular diagnostic testing and is particularly relevant to the electrical insulation of generators and large A.C. motors. The paper describes some recent advances in diagnostic techniques now being applied to monitor the in-service condition of stator and rotor windings of generators and large A.C. motors in service in the North Western Region of the Central Electricity Generating Board.