METHOD AND DEVICE FOR DETECTING SPARKING AND SPARK EROSION IN ELECTRIC MACHINES

摘要

The invention relates to a method and device for detecting spark activity in an electric machine. The shaft voltage (Us(t)) and/or the shaft current (Is(t)) are measured and characteristic components are analyzed in order to detect spark activity. The inventive method, which utilizes respective shaft currents which are mainly considered to be harmful, is precise and suitable for long-term monitoring of spark activities such as sparking, spark erosion, and spark discharges between parts of shaft bearings. Said method can be carried out in a constructively simple and reliable manner using available earthing devices.