JPS57151868A - Current detecting circuit - Google Patents

Current detecting circuit

Info

Publication number
JPS57151868A
JPS57151868A JP56035968A JP3596881A JPS57151868A JP S57151868 A JPS57151868 A JP S57151868A JP 56035968 A JP56035968 A JP 56035968A JP 3596881 A JP3596881 A JP 3596881A JP S57151868 A JPS57151868 A JP S57151868A
Authority
JP
Japan
Prior art keywords
current transformer
current
magnetic deflection
detecting
secondary side
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
JP56035968A
Other languages
Japanese (ja)
Inventor
Toshihiro Nomura
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Fuji 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 Fuji Electric Co Ltd, Fuji Electric Manufacturing Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP56035968A priority Critical patent/JPS57151868A/en
Publication of JPS57151868A publication Critical patent/JPS57151868A/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 detect an AC including a DC component highly accurately, by integrating the voltage induced in a current detecting current transformer, detecting magnetic deflection, and generating the electromotive force in the reverse direction in the current transformer. CONSTITUTION:The current, which is proportional to a primary current I1 flowing in a main circuit 10, is flowed in the secondary side of the current transformer 52. The voltage induced in the current transformer 52 is integrated by an integrating circuit formed by a resistor 22 of a magnetic deflection preventing part 18 in a current detecting circuit 16, a capacitor 24, and an operation amplifier 26. The integrated value is applied to operation amplifiers 36 and 38. When the magnetic deflection of the current transformer 52 becomes a specified value or more in the positive or negative direction, a transistor 28 or 30 is turned OFF through the amplifier 36 or 38. A Zener voltage caused by a Zener diode 32 or 34 is fed back to the secondary side of the current transformer 52, and the magnetic deflection is prevented. Thus, the AC including the DC component is highly accurately detected by an output synthesizing part without affecting the magnetic deflection.
JP56035968A 1981-03-14 1981-03-14 Current detecting circuit Pending JPS57151868A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56035968A JPS57151868A (en) 1981-03-14 1981-03-14 Current detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56035968A JPS57151868A (en) 1981-03-14 1981-03-14 Current detecting circuit

Publications (1)

Publication Number Publication Date
JPS57151868A true JPS57151868A (en) 1982-09-20

Family

ID=12456731

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56035968A Pending JPS57151868A (en) 1981-03-14 1981-03-14 Current detecting circuit

Country Status (1)

Country Link
JP (1) JPS57151868A (en)

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