JPS5497730A - Current transformer - Google Patents

Current transformer

Info

Publication number
JPS5497730A
JPS5497730A JP456178A JP456178A JPS5497730A JP S5497730 A JPS5497730 A JP S5497730A JP 456178 A JP456178 A JP 456178A JP 456178 A JP456178 A JP 456178A JP S5497730 A JPS5497730 A JP S5497730A
Authority
JP
Japan
Prior art keywords
core
flux
current transformer
current
compensating winding
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
JP456178A
Other languages
Japanese (ja)
Inventor
Eiichi Okamoto
Tatsuya Hirasawa
Shinichi Kuze
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.)
Meidensha Electric Manufacturing Co Ltd
Tokyo Electric Power Company Holdings Inc
Original Assignee
Tokyo Electric Power Co Inc
Meidensha Electric Manufacturing 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 Tokyo Electric Power Co Inc, Meidensha Electric Manufacturing Co Ltd filed Critical Tokyo Electric Power Co Inc
Priority to JP456178A priority Critical patent/JPS5497730A/en
Publication of JPS5497730A publication Critical patent/JPS5497730A/en
Pending legal-status Critical Current

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  • Transformers For Measuring Instruments (AREA)

Abstract

PURPOSE: To improve the transient characteristic of current transformer by detecting the DC flux in the core then cancelling said DC flux.
CONSTITUTION: A air gap is provided in the core of current transformer 1 and the fulx detector 3 for detecting the DC flux is provided in it. Furthermore secondary winding 2 and compensating winding 4 are wound around the core 1. The signal from the detector is amplified by the amplifier 6 then the polarity is decided at the polarity decider 7. Then the output from DC current controller 9 is controlled by phase control circuit 8. The output from said controller 9 is supplied through high impedance element 10 to the compensating winding 4. The DC flux in the core 1 is cancelled by the current in said compensating winding 4. Consequently the trasient saturation of the core is eliminated thereby the cross-section of the core is reduced and the transient characteristic is improved.
COPYRIGHT: (C)1979,JPO&Japio
JP456178A 1978-01-19 1978-01-19 Current transformer Pending JPS5497730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP456178A JPS5497730A (en) 1978-01-19 1978-01-19 Current transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP456178A JPS5497730A (en) 1978-01-19 1978-01-19 Current transformer

Publications (1)

Publication Number Publication Date
JPS5497730A true JPS5497730A (en) 1979-08-02

Family

ID=11587446

Family Applications (1)

Application Number Title Priority Date Filing Date
JP456178A Pending JPS5497730A (en) 1978-01-19 1978-01-19 Current transformer

Country Status (1)

Country Link
JP (1) JPS5497730A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61114827U (en) * 1984-12-28 1986-07-19
US4847554A (en) * 1987-03-04 1989-07-11 Sangamo Weston, Inc. Current measuring and magnetic core compensating apparatus and method
US20130049750A1 (en) * 2011-08-31 2013-02-28 Tsinghua University Giant Magnetoresistance Current Sensor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4827967A (en) * 1971-08-16 1973-04-13
JPS4936736A (en) * 1972-08-11 1974-04-05

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4827967A (en) * 1971-08-16 1973-04-13
JPS4936736A (en) * 1972-08-11 1974-04-05

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61114827U (en) * 1984-12-28 1986-07-19
US4847554A (en) * 1987-03-04 1989-07-11 Sangamo Weston, Inc. Current measuring and magnetic core compensating apparatus and method
US20130049750A1 (en) * 2011-08-31 2013-02-28 Tsinghua University Giant Magnetoresistance Current Sensor

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