Patent ID: 7541799
Filing Date: 2009-06-02
Classification: G01R

Abstract:
1. A method for measuring a current flowing in an electrical conductor with a sensor disposed in the region of the electrical conductor for measuring a magnetic field surrounding the electrical conductor, whereby the sensor comprises a magnetic circuit having a first and a second section and a magnetizing device for magnetic saturation of the second section, the method comprising: measuring the magnetic field after switching off a positive saturation of the second section to define a first measured magnetic field value B(P measuring the magnetic field after switching off a negative saturation of the second section to define a second measured magnetic field value B(P calculating a first mean switched off magnetic field value B(P measuring the magnetic field after switching on a positive saturation of the second section to define a fourth measured magnetic field value B(P measuring the magnetic field after switching on a negative saturation of the second section to define a fifth measured magnetic field value B(P calculating a second mean switched on magnetic field value B(P calculating a current flowing through the electrical conductor by subtracting the second mean switched on magnetic field value B(P