A study on the weak points of stator windings of high voltage rotating machinery for ships

ABSTRACT Reliability studies of existing rotating machine insulation systems mainly focused on reliability evaluation for diagnosis and life prediction of generators and motors of various onshore power plants. However, with the increase in commercial rated voltage of marine rotating machine, accidents related to insulation systems occur frequently, and since many difficulties are caused in repair and replacement, the demand for improved reliability of marine high-voltage rotating machine is increasing. Accordingly, several international classification societies have begun to require tests to confirm the reliability of the insulation system of high-voltage rotating machine for ships. For the first time among them, in accordance with Rule Proposal No.2015/EL01 (Rules and Regulations for the Classification of Ships, 2016) at Lloyd, international classification for generators and motors contracted after July 2016 is required. It was requested to present the insulation deterioration reliability results of the rotating machines insulation system according to the standards (IEC 60,034-18-31, IEC 60,034-18-32, IEC 60,034-18-33, IEC 60,034-18-34). In this paper, in order to check the weak points of the high-voltage rotating machinery of a ship against voltage deterioration among the above four standards, a test procedure was developed in accordance with the IEC 60,034-18-32 standard, and the weak points were identified and analyzed through testing did.