Current transformer and method for converting a conductor current flowing in an electrical conductor to an output signal

US9958481B2 · kind B2 · utility

Assignee

• Weidmüller Interface GmbH & Co. KG and PH · DE

Inventors

• Michael Gerkens · Bielefeld, DE
• Christian Heggemann · Detmold, DE
• Hans Schlingmann · Heubach, DE

Key dates

• Filing date: Mar 31, 2014
• Grant date: May 1, 2018
• Expiry date: Mar 31, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M1/0009
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A current transformer arrangement, and method, include a current sensor for producing a sensor output voltage that is proportional to the input current flowing in a conductor; a first processing branch including a voltage calculating device for calculating the effective voltage value of the sensor output voltage; a second processing branch including a polarity detecting device having an input terminal connected with the current sensor output terminal to produce a polarity signal having one polarity when the conductor input current is either an alternating current, a hybrid current, or a direct current flowing in one direction, and the opposite polarity when the conductor input current is a direct current flowing in the opposite direction; and a multiplier device for modifying the effective voltage value to produce a signed effective voltage having a polarity corresponding with the polarity of the polarity signal. A modifying circuit modifies the signed effective voltage.