GB2013000A - D.C. magnetic field cancellation circuit - Google Patents

D.C. magnetic field cancellation circuit

Info

Publication number
GB2013000A
GB2013000A GB7901310A GB7901310A GB2013000A GB 2013000 A GB2013000 A GB 2013000A GB 7901310 A GB7901310 A GB 7901310A GB 7901310 A GB7901310 A GB 7901310A GB 2013000 A GB2013000 A GB 2013000A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
magnetic field
cancellation circuit
transformer
field cancellation
21b
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB7901310A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F7/00Regulating magnetic variables
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38Auxiliary core members; Auxiliary coils or windings
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/40Structural association with built-in electric component, e.g. fuse
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M19/00Current supply arrangements for telephone systems
    • H04M19/001Current supply source at the exchanger providing current to substations
    • H04M19/003Arrangements for compensation of the DC flux in line transformers

Abstract

A D.C. magnetic field cancellation circuit in a transformer 21, having primary windings 21a, 21b and a secondary winding 21c, includes a Hall effect device 10 which detects the magnetic field generated in the transformer 21, a D.C. component of an output of the Hall effect device 10 being fedback to a third transformer winding 21e in order to cancel the D.C. magnetic field generated by the direct current flowing through the primary windings 21a, 21b. <IMAGE>
GB7901310A 1978-01-20 1979-01-12 D.C. magnetic field cancellation circuit Withdrawn GB2013000A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP435678A JPS5498104A (en) 1978-01-20 1978-01-20 Cancelling circuit for direct current magnetic field
JP5080178U JPS54153812U (en) 1978-04-19 1978-04-19
JP9180678U JPS559447U (en) 1978-07-05 1978-07-05

Publications (1)

Publication Number Publication Date
GB2013000A true true GB2013000A (en) 1979-08-01

Family

ID=27276233

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7901310A Withdrawn GB2013000A (en) 1978-01-20 1979-01-12 D.C. magnetic field cancellation circuit

Country Status (3)

Country Link
DE (1) DE2901699A1 (en)
FR (1) FR2423044A1 (en)
GB (1) GB2013000A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940025A1 (en) * 1978-10-06 1980-04-10 Philips Nv Speisebruecke for a subscriber, circuit
EP0058470A1 (en) * 1981-02-09 1982-08-25 Northern Telecom Limited Trunk interface circuit with current compensation
US4450427A (en) * 1981-12-21 1984-05-22 General Electric Company Contactor with flux sensor
EP0275483A1 (en) * 1986-12-22 1988-07-27 Mitsubishi Denki Kabushiki Kaisha Three-phase transformer for cycloconverter
WO2008151661A1 (en) * 2007-06-12 2008-12-18 Siemens Transformers Austria Gmbh & Co Kg Electrical transformer with unidirectional flux compensation
WO2012041368A1 (en) * 2010-09-29 2012-04-05 Siemens Transformers Austria Gmbh & Co Kg Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer
RU2453010C2 (en) * 2007-06-12 2012-06-10 Сименс Трансформерз Остриа Гмбх Унд Ко Кг Electric transformer with constant flow compensation
WO2015139743A1 (en) * 2014-03-19 2015-09-24 Siemens Aktiengesellschaft Dc compensation for high dc current in transformer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533762C2 (en) * 1985-09-21 1987-12-03 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De
DE3537187C2 (en) * 1985-10-18 1994-05-05 Siemens Ag A method for preventing saturation of a gleichstrominduktiven Sprechübertragers in telephone systems

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1478219A (en) * 1975-02-20 1977-06-29 Standard Telephones Cables Ltd Telecommunication exchange circuits
GB1479094A (en) * 1975-03-25 1977-07-06 Standard Telephones Cables Ltd Ring trip detectors
US4103112A (en) * 1977-10-17 1978-07-25 Northern Telecom Limited Telephone line circuit with differential loop current sensing and compensation

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2940025A1 (en) * 1978-10-06 1980-04-10 Philips Nv Speisebruecke for a subscriber, circuit
EP0058470A1 (en) * 1981-02-09 1982-08-25 Northern Telecom Limited Trunk interface circuit with current compensation
US4450427A (en) * 1981-12-21 1984-05-22 General Electric Company Contactor with flux sensor
EP0275483A1 (en) * 1986-12-22 1988-07-27 Mitsubishi Denki Kabushiki Kaisha Three-phase transformer for cycloconverter
RU2453010C2 (en) * 2007-06-12 2012-06-10 Сименс Трансформерз Остриа Гмбх Унд Ко Кг Electric transformer with constant flow compensation
WO2008151661A1 (en) * 2007-06-12 2008-12-18 Siemens Transformers Austria Gmbh & Co Kg Electrical transformer with unidirectional flux compensation
US8314674B2 (en) 2007-06-12 2012-11-20 Siemens Ag Österreich Electrical transformer with unidirectional flux compensation
WO2012041368A1 (en) * 2010-09-29 2012-04-05 Siemens Transformers Austria Gmbh & Co Kg Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer
KR20130099982A (en) * 2010-09-29 2013-09-06 지멘스 악티엔게젤샤프트 외스터라이히 Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer
US9046901B2 (en) 2010-09-29 2015-06-02 Siemens Aktiengesellschaft Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer
KR101720039B1 (en) 2010-09-29 2017-03-27 지멘스 악티엔게젤샤프트 Device and method for reducing a magnetic unidirectional flux fraction in the core of a transformer
WO2015139743A1 (en) * 2014-03-19 2015-09-24 Siemens Aktiengesellschaft Dc compensation for high dc current in transformer
CN106104721A (en) * 2014-03-19 2016-11-09 西门子公司 DC compensation for high DC current in transformer
US10032556B2 (en) 2014-03-19 2018-07-24 Siemens Aktiengesellschaft DC compensation for high DC current in transformer

Also Published As

Publication number Publication date Type
FR2423044A1 (en) 1979-11-09 application
DE2901699A1 (en) 1979-07-26 application

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)