公开(公告)号：US20180172768A1

公开(公告)日：2018-06-21

申请号：US15380724

申请日：2016-12-15

Applicant: Eaton Corporation

Inventor： Santosh Kumar Sharma ,  Abhilash Pani ,  Steven Andrew Dimino ,  Mark Alan Verheyen

IPC: G01R31/34 ,  G01R31/42

CPC classification number: G01R31/34 ,  G01R31/025 ,  G01R31/06 ,  G01R31/346 ,  G01R31/42

Abstract: A system and method for detecting a phase-to-ground fault in an AC electrical machine operates to receive measurements of three-phase voltages and currents provided to the AC electrical machine, compute at least one of a zero sequence component and a negative sequence component of voltage and current from the three-phase voltages and currents, and calculate a fault severity index (F SI) based on the zero or negative sequence component of voltage and current, so as to identify a phase-to-ground fault in the AC electrical machine. Calculating the FSI further includes determining a total value of the zero or negative sequence current, determining a noise-contributed value of the zero or negative sequence current included in the total value, determining a compensated value of the zero or negative sequence current based on the total value and the noise-contributed value, and calculating the FSI based on the compensated value.