JPS57127856A - 3-phase current detection system - Google Patents

3-phase current detection system

Info

Publication number
JPS57127856A
JPS57127856A JP1344081A JP1344081A JPS57127856A JP S57127856 A JPS57127856 A JP S57127856A JP 1344081 A JP1344081 A JP 1344081A JP 1344081 A JP1344081 A JP 1344081A JP S57127856 A JPS57127856 A JP S57127856A
Authority
JP
Japan
Prior art keywords
current
phases
current transformers
ctb
microcomputer
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
JP1344081A
Other languages
Japanese (ja)
Inventor
Suke Ishimoto
Tokihide Nibu
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1344081A priority Critical patent/JPS57127856A/en
Publication of JPS57127856A publication Critical patent/JPS57127856A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To enable the detection of load current effectively utilizing existing current transformers and the like by inputting current of desired two phases among those varied in the phase to a secondary current transformer in an equipment through a current transformer so as to be converted into voltage. CONSTITUTION:Current transformers CT1 and CT2 respectively set in phases a and b are separated on the side R and connected to an ammeter switching device AS via secondary current transformers CTa and CTb. Outputs of the secondary current transformers CTa and CTb are input into an analog adder OP1 and a voltage is output corresponding to current in the phase c. On the other hand, analog switches ANS1, ANS2 and ANS3 are ON-OFF controlled sequentially with a microcomputer 3 and the output of each switch is input to the microcomputer 3 by way of an AC/DC conversion circuit 1 and an A/D converter 2. Current of three phases is displayed on an indication element 4. This can simplify the work utilizing existing ammeter current transformer enabling the control of power consumption with limited investment.
JP1344081A 1981-01-30 1981-01-30 3-phase current detection system Pending JPS57127856A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1344081A JPS57127856A (en) 1981-01-30 1981-01-30 3-phase current detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1344081A JPS57127856A (en) 1981-01-30 1981-01-30 3-phase current detection system

Publications (1)

Publication Number Publication Date
JPS57127856A true JPS57127856A (en) 1982-08-09

Family

ID=11833184

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1344081A Pending JPS57127856A (en) 1981-01-30 1981-01-30 3-phase current detection system

Country Status (1)

Country Link
JP (1) JPS57127856A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61194370A (en) * 1985-02-22 1986-08-28 Hioki Denki Kk Voltage/current detection circuit of multiphase ac line
JPH02184765A (en) * 1989-01-10 1990-07-19 Mitsubishi Electric Corp Detector for 3-phase ac current
JPH04262268A (en) * 1991-02-05 1992-09-17 Mitsubishi Electric Corp Current measuring instrument
EP0644429A2 (en) * 1993-09-22 1995-03-22 Siemens Aktiengesellschaft Three-phase-three-conductors current meter with three measuring systems
JP2010071776A (en) * 2008-09-18 2010-04-02 Toshiba Mitsubishi-Electric Industrial System Corp Device for detecting alternating current

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61194370A (en) * 1985-02-22 1986-08-28 Hioki Denki Kk Voltage/current detection circuit of multiphase ac line
JPH02184765A (en) * 1989-01-10 1990-07-19 Mitsubishi Electric Corp Detector for 3-phase ac current
JPH04262268A (en) * 1991-02-05 1992-09-17 Mitsubishi Electric Corp Current measuring instrument
EP0644429A2 (en) * 1993-09-22 1995-03-22 Siemens Aktiengesellschaft Three-phase-three-conductors current meter with three measuring systems
EP0644429A3 (en) * 1993-09-22 1996-03-20 Siemens Ag Three-phase-three-conductors current meter with three measuring systems.
JP2010071776A (en) * 2008-09-18 2010-04-02 Toshiba Mitsubishi-Electric Industrial System Corp Device for detecting alternating current

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