JPS57207313A - Method of demagnetizing induction electric equipment - Google Patents
Method of demagnetizing induction electric equipmentInfo
- 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
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.
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)
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 |
-
1981
- 1981-06-16 JP JP9153781A patent/JPS57207313A/en active Pending
Cited By (6)
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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