Device for measuring the direct component of alternating current

Patent metadata

Field	Value
Publication number	US-9279836-B2
Application number	US-201313948233-A
Country	US
Kind code	B2
Filing date	Jul 23, 2013
Priority date	Jul 27, 2012
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

The invention relates to a device for measuring the direct component of alternating current, applicable in current measuring systems where a low direct component of alternating current and a high amplitude of the alternating component of alternating current occur. The device for measuring the direct component of alternating current comprises a current-carrying wire ( 1 ) around which there is located a magnetic core ( 2 ) provided with a gap ( 3 ) in which a magnetic field sensor ( 4 ) with insulated terminals ( 5 ) is located and it comprises a shorted compensating winding ( 6 ) or ( 9 ) which is made in the form of a single turn coil placed on the core ( 2 ).

First claim

The invention claimed is:

1. A device for measuring the direct component of alternating current, using a current-carrying wire around which there is located a magnetic core provided with a gap in which a magnetic field sensor with insulated terminals is located, characterized in that the device comprises a shorted compensating winding which is made in the form of a single turn coil placed on the core and wherein the shorted compensating winding has the form of a tubular conducting ring, characterized in that the tubular conducting ring has the shape of a torus made of two halves, an upper one and a bottom one, which are mechanically and electrically permanently connected with each other along the circumference of the torus.

2. A device according to claim 1 , characterized in that the shorted compensating winding is made from a low-resistivity material such as copper or aluminum which is spaced apart from said magnetic core and has an insulating layer therebetween.

3. A device according to claim 1 , characterized in that there is an insulating layer between the inner surface of the tubular conducting ring made from a low-resistivity material and the outer surface of the core.

Assignees

• Abb Technology Ag

Inventors

• Ostrogorska Magdalena
• Grecki Filip
• Szewczyk Marcin
• Piasecki Wojciech
• Balcerek Przemyslaw
• Fulczyk Marek

Classifications

• G01R19/20 Primary

  using transductors {, i.e. a magnetic core transducer the saturation of which is cyclically reversed by an AC source on the secondary side} · CPC title

• G01R15/185 Primary

  with compensation or feedback windings or interacting coils, e.g. 0-flux sensors (using galvano-magnetic field sensors G01R15/20; conversion of DC into AC using transductors G01R19/20) · CPC title

• G01R15/20

  using galvano-magnetic devices, e.g. Hall-effect devices {, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices} · CPC title