JPS56115956A - Electric current detection device - Google Patents

Electric current detection device

Info

Publication number
JPS56115956A
JPS56115956A JP1784780A JP1784780A JPS56115956A JP S56115956 A JPS56115956 A JP S56115956A JP 1784780 A JP1784780 A JP 1784780A JP 1784780 A JP1784780 A JP 1784780A JP S56115956 A JPS56115956 A JP S56115956A
Authority
JP
Japan
Prior art keywords
current
detected
frequency
current detection
detection device
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
JP1784780A
Other languages
Japanese (ja)
Inventor
Yoshimi Kurotaki
Kiyoshi Nakamura
Yoshitaka Nanba
Tadao Kawai
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
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1784780A priority Critical patent/JPS56115956A/en
Publication of JPS56115956A publication Critical patent/JPS56115956A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

PURPOSE:To magnify the ratio of a signal of the AC current having the frequency superposed on the DC current to be detected to a noise for making it possible to be detected by making the AC power source frequency of a current detection device higher than the frequency of the AC signal to be detected. CONSTITUTION:The current ic to be detected is made to flow in the input windings 7 and 8 to be detected of the current detection device excited by the AC power source device 45 of the optional frequency and the bias current ib is made to flow in the bias windings 15 and 16, then the electromagnetic force Fc is generated in the iron cores 1 and 2. In case said magnetomotive force Fc is bigger than the excited magnetmotive force Fo and the operation territory of the magnetic amplifier is the reverse feedback territory, the law of equal ampere turn is established between the magnetomotive force Fc and the output current iL and the input current ic of the magnetomotive force Fc and the wave form of the output current iL become similar thus the input current ic and the output current iL come into a proportional relation. Thereby the ratio of the signal of the AC to be detected to the noise gats bigger for making it possible to perform the good current detection.
JP1784780A 1980-02-18 1980-02-18 Electric current detection device Pending JPS56115956A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1784780A JPS56115956A (en) 1980-02-18 1980-02-18 Electric current detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1784780A JPS56115956A (en) 1980-02-18 1980-02-18 Electric current detection device

Publications (1)

Publication Number Publication Date
JPS56115956A true JPS56115956A (en) 1981-09-11

Family

ID=11955052

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1784780A Pending JPS56115956A (en) 1980-02-18 1980-02-18 Electric current detection device

Country Status (1)

Country Link
JP (1) JPS56115956A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58148966A (en) * 1982-02-27 1983-09-05 Matsushita Electric Works Ltd Current detecting circuit
JPH0543894U (en) * 1991-11-14 1993-06-15 英俊 鍋島 Root vegetable peeler
CN102879624A (en) * 2012-09-06 2013-01-16 华中科技大学 Direct-current-free magnetized bidirectional magnetic amplifier for direct-current large current detection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58148966A (en) * 1982-02-27 1983-09-05 Matsushita Electric Works Ltd Current detecting circuit
JPH0543894U (en) * 1991-11-14 1993-06-15 英俊 鍋島 Root vegetable peeler
CN102879624A (en) * 2012-09-06 2013-01-16 华中科技大学 Direct-current-free magnetized bidirectional magnetic amplifier for direct-current large current detection

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