Modeling Common-Mode Current Due to Asymmetric Aging of Machine Winding Insulation

Machine stator winding insulation degradation is one of the main results machine aging. It non-negligible once this process becomes asymmetric between phases. The traditional way to determine state health a partial discharge test. However, method requires system offline, which causes production loss and extra administrative burden. This paper presents an idea for better characterizing machine's using common-mode (CM) behavior in machine-drive system. With help circuit decomposition methods modeling tools, CM quantities due aging show unique characteristic that distinguishes itself from other differential-mode (DM) equivalent circuit. shown effective represent effect detection leakage current. provides analytical quantify mathematical approaches, proper approximation has been made on model (CEM) such accurately characterized. proposed will serve purpose predicting abnormal simple RLC Researchers can adapt characterize (SOH).