Title of Invention	MEASURING TRANSDUCER
Abstract	ABSTRACT 537/CHENP/2004 MEASURING TRANSDUCER The present invention relates to a measuring transducer for comparing a current flowing through a conductor to a reference current comprising a magnetic circuit formed by a troidal core, a conductor through which the current flows and which is enclosed by the toroidal core, a secondary winding arranged on the toroidal core, and a magnetic flux measuring element which is arranged in a gap of the toroidal core and which is sensitive to the magnetic field in the gap, wherein there is provided a reference setting unit for acting on the secondary winding with a predefined reference current which sets the current which is to flow in the conductor through which current flows, and wherein the magnetic flux measuring element is adapted to deliver a difference signal representative of the difference between the reference current and the current flowing through the conductor.

Title of Invention

MEASURING TRANSDUCER

Abstract

Full Text	ABSTRACT 537/CHENP/2004 MEASURING TRANSDUCER The present invention relates to a measuring transducer for comparing a current flowing through a conductor to a reference current comprising a magnetic circuit formed by a troidal core, a conductor through which the current flows and which is enclosed by the toroidal core, a secondary winding arranged on the toroidal core, and a magnetic flux measuring element which is arranged in a gap of the toroidal core and which is sensitive to the magnetic field in the gap, wherein there is provided a reference setting unit for acting on the secondary winding with a predefined reference current which sets the current which is to flow in the conductor through which current flows, and wherein the magnetic flux measuring element is adapted to deliver a difference signal representative of the difference between the reference current and the current flowing through the conductor. I CLAIM: 1. A measuring transducer for comparing a current flowing through a conductor (16) to a reference current comprising a magnetic circuit formed by a troidal core (10), a conductor (16) through which the current flows and which is enclosed by the toroidal core (10), a secondary winding (18) arranged on the toroidal core (10), and a magnetic flux measuring element (12) which is arranged in a gap of the toroidal core (10) and which is sensitive to the magnetic field in the gap, wherein there is provided a reference setting unit (26) for acting on the secondary winding (18) with a predefined reference current which sets the current which is to flow in the conductor (16) through which current flows, and wherein the magnetic flux measuring element (12) is adapted to deliver a difference signal representative of the difference between the reference current and the current flowing through the conductor (16). 2. The measuring transducer as claimed in claim 1, wherein the magnetic flux measuring element (12) is a Hall element. 3. The measuring transducer as claimed in any one of the preceding claims, wherein the connected downstream of the output of the magnetic flux measuring element (12) is an amplifier (14) for amplifying the electrical output signal of the magnetic flux measuring element (12). 4. The measuring transducer as claimed in any one of the preceding claims, wherein a regulating unit (28) is provided for controlling the current flowing through the conductor (16) so that the current flowing through the conductor (16) approximates to the reference current. 5. The measuring transducer as claimed in any one of the preceding claims, wherein measuring means are connected downstream of the magnetic flux measuring element (12) for superimposition of the reference current with the output signal of the magnetic flux measuring element (12) to form the absolute value. 6. A control unit for controlling or regulating a current flowing through a conductor (16) with a measuring transducer according to any one of the preceding claims for measuring the current flowing through the conductor (16). 7. An inverter, in particular for a wind power installation, having a control unit according to claim 6, for controlling the output current of the inverter. 8. The inverter as claimed in claim 7, wherein the reference setting unit (26) is part of the inverter. 9. A wind power installation having an inverter as claimed in claim 7 or 8. 10. A measuring transducer substantially as herein described with reference to figure 2 of the accompanying drawings.

Full Text

ABSTRACT
537/CHENP/2004
MEASURING TRANSDUCER
The present invention relates to a measuring transducer for comparing a current flowing through a conductor to a reference current comprising a magnetic circuit formed by a troidal core, a conductor through which the current flows and which is enclosed by the toroidal core, a secondary winding arranged on the toroidal core, and a magnetic flux measuring element which is arranged in a gap of the toroidal core and which is sensitive to the magnetic field in the gap, wherein there is provided a reference setting unit for acting on the secondary winding with a predefined reference current which sets the current which is to flow in the conductor through which current flows, and wherein the magnetic flux measuring element is adapted to deliver a difference signal representative of the difference between the reference current and the current flowing through the conductor.

I CLAIM:
1. A measuring transducer for comparing a current flowing through a conductor (16) to a reference current comprising a magnetic circuit formed by a troidal core (10), a conductor (16) through which the current flows and which is enclosed by the toroidal core (10), a secondary winding (18) arranged on the toroidal core (10), and a magnetic flux measuring element (12) which is arranged in a gap of the toroidal core (10) and which is sensitive to the magnetic field in the gap, wherein there is provided a reference setting unit (26) for acting on the secondary winding (18) with a predefined reference current which sets the current which is to flow in the conductor (16) through which current flows, and wherein the magnetic flux measuring element (12) is adapted to deliver a difference signal representative of the difference between the reference current and the current flowing through the conductor (16).
2. The measuring transducer as claimed in claim 1, wherein the magnetic flux measuring element (12) is a Hall element.
3. The measuring transducer as claimed in any one of the preceding claims, wherein the connected downstream of the output of the magnetic flux measuring element (12) is an amplifier (14) for amplifying the electrical output signal of the magnetic flux measuring element (12).
4. The measuring transducer as claimed in any one of the preceding claims, wherein a regulating unit (28) is provided for controlling the current flowing through the conductor (16) so that the current flowing through the conductor (16) approximates to the reference current.

5. The measuring transducer as claimed in any one of the preceding
claims, wherein measuring means are connected downstream of the magnetic flux
measuring element (12) for superimposition of the reference current with the
output signal of the magnetic flux measuring element (12) to form the absolute
value.
6. A control unit for controlling or regulating a current flowing through
a conductor (16) with a measuring transducer according to any one of the
preceding claims for measuring the current flowing through the conductor (16).
7. An inverter, in particular for a wind power installation, having a
control unit according to claim 6, for controlling the output current of the inverter.
8. The inverter as claimed in claim 7, wherein the reference setting unit
(26) is part of the inverter.
9. A wind power installation having an inverter as claimed in claim 7
or 8.
10. A measuring transducer substantially as herein described with
reference to figure 2 of the accompanying drawings.

Documents:

537-chenp-2004-abstract.pdf

537-chenp-2004-claims.pdf

537-chenp-2004-correspondnece-others.pdf

537-chenp-2004-correspondnece-po.pdf

537-chenp-2004-description(complete).pdf

537-chenp-2004-drawings.pdf

537-chenp-2004-form 1.pdf

537-chenp-2004-form 26.pdf

537-chenp-2004-form 3.pdf

537-chenp-2004-form 5.pdf

537-chenp-2004-form19.pdf

537-chenp-2004-pct.pdf

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Patent Number

201342

Indian Patent Application Number

537/CHENP/2004

PG Journal Number

01/2009

Publication Date

02-Jan-2009

Grant Date

07-Jul-2006

Date of Filing

12-Mar-2004

Name of Patentee

SHRI. WOBBEN, Aloys

Applicant Address

Argestrasse 19, 26607 Aurich

Inventors:

#	Inventor's Name	Inventor's Address
1	WOBBEN, Aloys	Argestrasse 19, 26607 Aurich

PCT International Classification Number

G01R 15/20

PCT International Application Number

PCT/EP2002/09748

PCT International Filing date

2002-08-31

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	101 45 415.5	2001-09-14	Germany