Patent ID: 7358716
Filing Date: 2008-04-15
Classification: G01R

Abstract:
1. A measuring method for measuring currents with a large dynamic range by means of a magnetic measuring module that comprises a magnetic core with at least one compensation coil surrounding said core, an air gap, and a core opening, wherein a magnetic field probe is arranged in the air gap and a primary conductor conducting the current which is to be measured is guided through the core opening, the method comprising the following steps: Switching into a high-current mode when a current threshold value is exceeded, and switching into a low-current mode otherwise, wherein the low-current mode comprises the following steps: Feeding a first current pulse to the compensation coil, which drives the magnetic core in a first direction until magnetic saturation occurs, Measuring a first primary current value I Feeding a second current pulse to the compensation coil, which drives the magnetic core in a counter second direction until magnetic saturation occurs, Measuring a second primary current value I Determining the corrected primary current value subsequently as an average value I=(I