Measuring method and measuring arrangement for measuring currents with a large dynamic range

US7358716B2 · kind B2 · utility

Assignee

• Vacuumschmelze GmbH & Co. KG · DE

Inventors

• Norbert Preusse · Alzenau, DE
• Stefan Schaefer · Wetzlar, DE
• Friedrich Lenhard · Hanau, DE

Key dates

• Filing date: Jan 12, 2006
• Grant date: Apr 15, 2008
• Expiry date: Apr 6, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R15/185
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A measuring method for measuring currents with a large dynamic range by means of a magnetic measuring module has the steps of 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 has the following steps:—Feeding a first current pulse to a compensation coil, which drives a magnetic core in a first direction until magnetic saturation occurs,—measuring a first primary current value I1 after the current pulse is disconnected,—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 I2 after the second current pulse is disconnected,—determining the corrected primary current value subsequently as an average value I=(I1+I2)/2 from the first and the second primary current values.