Measuring Arrangement for Detecting a Magnetic Unidirectional Flux in the Core of a Transformer

Patent metadata

Field	Value
Publication number	US-2017089986-A1
Application number	US-201515312536-A
Country	US
Kind code	A1
Filing date	May 7, 2015
Priority date	Jun 6, 2014
Publication date	Mar 30, 2017
Grant date	—

Abstract

Measuring arrangement for detecting a magnetic unidirectional flux in the core of a transformer, wherein a sensor, formed from a ferromagnetic sensor core which is surrounded by a sensor coil, is arranged in a section of a core limb in a cooking channel, where the section is predefined by the width of the winding, or is arranged in an annular space, formed from an outer peripheral surface of the core limb and an inner peripheral surface of an associated transformer winding, such that a magnetic partial flux is diverted by the core limb and guided over at least one non-ferromagnetic gap.

First claim

1 .- 9 . (canceled)

10 . A measuring arrangement for detecting a magnetic unidirectional flux in the core of a transformer, comprising:
a core limb; a sensor coil; and a sensor, formed from a ferromagnetic sensor core enwound by the sensor coil, arranged in a section of the core limb, said section being predetermined by a winding width, in a cooling channel or in an annular space which is formed by an outer peripheral surface of the core limb and an inner peripheral surface of a transformer winding, such that a magnetic partial flux is diverted from the core limb and guided over at least one non-ferromagnetic gap.

11 . The measuring arrangement as claimed in claim 10 , wherein the sensor core is prismed shaped and extends in a longitudinal direction; wherein the longitudinal direction is oriented in a direction of the limb axis during use of the sensor.

12 . The measuring arrangement as claimed in claim 11 , wherein a base of the prism is rectangular.

13 . The measuring arrangement as claimed in claim 11 , wherein a length of the sensor core is more than twice its width.

14 . The measuring arrangement as claimed in claim 12 , wherein a length of the sensor core is more than twice its width.

15 . The measuring arrangement as claimed in claim 13 , wherein the ferromagnetic sensor core and the sensor coil are formed together as an insert in a bar-shaped suspension device.

16 . The measuring arrangement as claimed in claim 15 , wherein the suspension device includes a carrier comprising a fiber-reinforced synthetic material; and wherein the carrier includes a longitudinally extending shell-like recess for receiving the sensor.

17 . The measuring arrangement as claimed in claim 16 , wherein the sensor and the carrier form a hybrid component comprising a synthetic material manufactured via injection molding technology.

18 . A compensating device for compensating a magnetic unidirectional flux in an electrical transformer, comprising:
a sensor which detects the unidirectional flux in at least one core limb of the transformer; wherein: a) the sensor includes a ferromagnetic sensor core which extends in a longitudinal direction and is enwound by a sensor coil; and wherein: b) the sensor is arranged in a section, said section being predetermined by width of direction enwound by the sensor coil, in a cooling channel of the core limb or in an annular space formed by an outer peripheral surface of the core limb and an inner peripheral surface of a transformer winding such that a magnetic partial flux is diverted from the core limb and guided over at least one non-ferromagnetic gap.

19 . A method for compensating a magnetic unidirectional flux in a magnetic core of an electrical transformer, comprising:
detecting, via a compensating device which is supplied with a sensor signal from a sensor, the unidirectional flux, the sensor including a ferromagnetic sensor core which is elongated and enwound by a sensor coil; and arranging the sensor in its intended place of use longitudinally in a direction of a limb axis in one of (i) a cooling channel and (ii) an intermediate space between an inner peripheral surface of a transformer winding and a side face of a core limb.

Assignees

• Siemens Ag
• Siemens Ag

Inventors

• Hamberger Peter
• Leber Gerald
• Passath Helfried
• Pregartner Helmut
• Schrammel Alfons-Karl

Classifications

• G01R33/04

  using the flux-gate principle · CPC title

• H01F27/38 Primary

  Auxiliary core members; Auxiliary coils or windings · CPC title

• H01F27/42

  Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H) · CPC title

• G01R33/02

  Measuring direction or magnitude of magnetic fields or magnetic flux (G01R33/20 takes precedence) · CPC title

• G01R33/0017 Primary

  Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields · CPC title