公开(公告)号：US09863998B2

公开(公告)日：2018-01-09

申请号：US15359441

申请日：2016-11-22

Applicant: ROLLS-ROYCE plc

Inventor： Steven Fletcher ,  Patrick Norman ,  Stuart J Galloway

IPC: G01R31/02 ,  G01R31/08

CPC classification number: G01R31/08 ,  G01R31/088 ,  H02H3/087

Abstract: A method of determining the location of a fault within a first inductive part of an electrical circuit, including a voltage source, first inductive part and second inductive part. A shortened circuit created by the fault includes the voltage source, a portion of the first inductive part and the second, connected in series. The fault occurs across first and second points in the first inductive part. The length of first inductive part between a positive terminal and first point is substantially equal to the length of first inductive part between a negative terminal and second point. The voltage source supplies a known voltage Vs when the fault occurs and the second inductive part has a known inductance L2 when the fault occurs. The method takes advantage of the initial transient response of the circuit to determine the inductance of the portion of the first inductive part in the shortened circuit.