JPS57207313A - Method of demagnetizing induction electric equipment - Google Patents

Method of demagnetizing induction electric equipment

Info

Publication number
JPS57207313A
JPS57207313A JP9153781A JP9153781A JPS57207313A JP S57207313 A JPS57207313 A JP S57207313A JP 9153781 A JP9153781 A JP 9153781A JP 9153781 A JP9153781 A JP 9153781A JP S57207313 A JPS57207313 A JP S57207313A
Authority
JP
Japan
Prior art keywords
transformer
current
capacitor
electric equipment
induction electric
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.)
Pending
Application number
JP9153781A
Other languages
Japanese (ja)
Inventor
Yasutaka Hidaka
Shoji Yamashita
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP9153781A priority Critical patent/JPS57207313A/en
Publication of JPS57207313A publication Critical patent/JPS57207313A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

PURPOSE:To demagnetize the residual magnetism of the induction electric equipment safely in a short time, by generating a damped oscillation of a resonant frequency in the series circuit of a winding and a capacitor in the induction electric equipment. CONSTITUTION:The capacitor Co has electrostatic capacity, by which the resonant frequency of the series circuit of a reactance L of a transformer Tr1 and the capacitor becomes sufficiently lower than a commercial frequency. A power source switch SW1 is closed, and a DC i0 is conducted through the secondary winding of the transformer Tr1 through a resistor r from a power source BA so that the current becomes equal to or larger than the saturating current of the transformer Tr1 and it is excited by the DC. When the switch SW1 is opened, the damped oscillation current i1 is generated in the series circuit of the reactance L of the transformer Tr1 and the capacitor C0. The residual magnetism in the core of the transformer Tr1 is demagnetized by the flowing of the damped oscillating current i1 based on the current i0 in the transformer Tr1.
JP9153781A 1981-06-16 1981-06-16 Method of demagnetizing induction electric equipment Pending JPS57207313A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9153781A JPS57207313A (en) 1981-06-16 1981-06-16 Method of demagnetizing induction electric equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9153781A JPS57207313A (en) 1981-06-16 1981-06-16 Method of demagnetizing induction electric equipment

Publications (1)

Publication Number Publication Date
JPS57207313A true JPS57207313A (en) 1982-12-20

Family

ID=14029208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9153781A Pending JPS57207313A (en) 1981-06-16 1981-06-16 Method of demagnetizing induction electric equipment

Country Status (1)

Country Link
JP (1) JPS57207313A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172456A1 (en) * 2000-07-12 2002-01-16 OTB Group B.V. Lock for vacuum chamber
JP2002204440A (en) * 2000-12-28 2002-07-19 Hochiki Corp Booster for catv
JP2007234837A (en) * 2006-02-28 2007-09-13 Kyushu Electric Power Co Inc Transformer circuit, and method for reducing residual magnetic flux of transformer
CN112530659A (en) * 2020-11-30 2021-03-19 北京航空航天大学 A simulation demagnetization current generating device for magnetism shielding section of thick bamboo demagnetization

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172456A1 (en) * 2000-07-12 2002-01-16 OTB Group B.V. Lock for vacuum chamber
JP2002204440A (en) * 2000-12-28 2002-07-19 Hochiki Corp Booster for catv
JP4577861B2 (en) * 2000-12-28 2010-11-10 ホーチキ株式会社 CATV booster
JP2007234837A (en) * 2006-02-28 2007-09-13 Kyushu Electric Power Co Inc Transformer circuit, and method for reducing residual magnetic flux of transformer
CN112530659A (en) * 2020-11-30 2021-03-19 北京航空航天大学 A simulation demagnetization current generating device for magnetism shielding section of thick bamboo demagnetization
CN112530659B (en) * 2020-11-30 2022-04-12 北京航空航天大学 A simulation demagnetization current generating device for magnetism shielding section of thick bamboo demagnetization

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