公开(公告)号：US10267860B2

公开(公告)日：2019-04-23

申请号：US14626026

申请日：2015-02-19

Applicant: ROLLS-ROYCE PLC

Inventor： Subash C Athikessavan ,  Sivakumar Nadarajan ,  Amit Kumar Gupta ,  Sanjib K Panda

IPC: G01R31/00 ,  G01R19/165 ,  G01R31/34 ,  G01R31/02 ,  G01R31/06

Abstract: A method of detecting a fault in an induction machine having one or more windings arranged to draw current at a supply frequency, the method including: performing a process of judging whether a respective sideband of one or more selected harmonics of the supply frequency exists at a predetermined fault frequency in a signal in the one or more windings; and determining that a fault has occurred if the judgement is positive; wherein in the judging process each of the selected harmonics of the supply frequency is a harmonic frequency of the supply frequency other than the supply frequency itself.