Patents Assigned to Wirescan AS
  • Method for measuring an impedance of an electric cable, a coupler arrangement and uses thereof
    Patent number: 11280849
    Abstract: The invention relates to a method for cable condition monitoring of an electric cable. The method comprises inducing a test current in the electric cable, measuring a resulting current in a measurement point of the electric cable by measuring a magnetic nearfield of the electric cable, measuring a resulting voltage in the measurement point of the electric cable by measuring an electric nearfield of the cable, calculating an impedance of the electric cable based on the resulting current and the resulting voltage by a line resonance analysis system, and analysing the impedance by the line resonance analysis system establishing a condition of the electric cable. A coupler arrangement providing a non-galvanic connection to the cable is also disclosed.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: March 22, 2022
    Assignee: WIRESCAN AS
    Inventors: Truls Fallet, Sigbjørn Kolberg
  • Method and system for monitoring a condition of electrical cables
    Patent number: 10359462
    Abstract: A method and a system are described for monitoring a condition of an electrical cable. The method comprises applying a broadband signal wave to a first end of the electrical cable, wherein the broadband signal wave is phase and amplitude modulated and acquiring the phase and amplitude modulated broadband signal wave transmitted and reflected by the electrical cable. Signal analyses is performed which results in establishing a relationship between a real and an imaginary part of a phase impedance spectrum Fourier transform of the power spectrum in an interval around at least one of the locations along the cable, and identifying impedance changes in these locations. Analyzing a second order reflection of the broadband signal in said identified fault locations may establish a local degradation severity of an identified fault in the cable insulation in at least one of the locations along the cable.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: July 23, 2019
    Assignee: WIRESCAN AS
    Inventor: Paolo Franco Fantoni
  • Line resonance analysis system
    Patent number: 7966137
    Abstract: The present invention provides a method for monitoring a condition of an electrical cable, the method including: providing a reference signal CH0 and a signal CH1, the signal CH1 being the reference signal CH0 after amplitude and phase modulation by a cable impedance ZDUT of the electrical cable; calculating the cable impedance ZDUT as a function of the applied signal frequency based on the reference signal CH0 and the signal CH1; and analyzing the cable impedance providing an assessment of the cable condition. A system performing the method is also disclosed.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: June 21, 2011
    Assignee: Wirescan AS
    Inventor: Paolo F. Fantoni