Method and configuration for current measurement

US6346805B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Jochen Ermisch · Radebeul, DE
• Uwe Stephan · Freital, DE
• Frank Thieme · Dresden, DE
• Peter Bauerschmidt · Schwabach, DE

Key dates

• Filing date: Apr 14, 1999
• Grant date: Feb 12, 2002
• Expiry date: Apr 14, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R15/146
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

For precise measurement of currents with high dynamic range, especially in gas-insulated voltage switchgear, a first signal of a first low-power measurement transformer and a second signal of a second nonmagnetic measurement transformer, operating, for example, according to the principle of a Rogowski coil or according to the Faraday effect, are compared. Depending on the degree of accuracy, one of the two signals is then selected and further processed. A deviation of the two signals from each other, especially their gradient, is referred to as comparison criterion. In a corresponding configuration, the two measurement transformers of different type are connected to a common processing component for signal processing.