CA2082112A1 - Current Ratio Device and Toroidal Core Assembly Therefor - Google Patents

Current Ratio Device and Toroidal Core Assembly Therefor

Info

Publication number
CA2082112A1
CA2082112A1 CA 2082112 CA2082112A CA2082112A1 CA 2082112 A1 CA2082112 A1 CA 2082112A1 CA 2082112 CA2082112 CA 2082112 CA 2082112 A CA2082112 A CA 2082112A CA 2082112 A1 CA2082112 A1 CA 2082112A1
Authority
CA
Canada
Prior art keywords
assemblies
sub
assembly
core
current ratio
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.)
Granted
Application number
CA 2082112
Other languages
French (fr)
Other versions
CA2082112C (en
Inventor
Eddy So
Shiyan Ren
Original Assignee
National Research Council of Canada
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 National Research Council of Canada filed Critical National Research Council of Canada
Priority to CA 2082112 priority Critical patent/CA2082112C/en
Publication of CA2082112A1 publication Critical patent/CA2082112A1/en
Application granted granted Critical
Publication of CA2082112C publication Critical patent/CA2082112C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/32—Circuit arrangements
    • 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
    • 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
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions

Landscapes

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

Abstract

A current ratio device is used for forming a current transformer that can accurately scale down high currents to usable metering levels. The transformer has associated circuitry that renders it capable of functioning not only with ac and a mixture of ac and dc, but also when dc alone is present in the primary winding. The device employs a toroidal core and winding assembly that is cut along a plane containing the toroidal axis through a pair of diametrically opposite sections of the assembly that contain no windings, in order to separate the device into a pair of sub-assemblies that can be readily placed over a single turn primary, e.g. a busbar, without dismantling the same. Once so placed, the sub-assemblies can then be clamped together again to reform the device and the winding portions externally connected to the circuitry, the latter being such as to avoid the accuracy of measurement being significantly effected by the unavoidable increase in core reluctance that will have resulted from the separation of the core assembly into two sub-assemblies.
CA 2082112 1992-11-04 1992-11-04 Current ratio device and toroidal core assembly therefor Expired - Lifetime CA2082112C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2082112 CA2082112C (en) 1992-11-04 1992-11-04 Current ratio device and toroidal core assembly therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2082112 CA2082112C (en) 1992-11-04 1992-11-04 Current ratio device and toroidal core assembly therefor

Publications (2)

Publication Number Publication Date
CA2082112A1 true CA2082112A1 (en) 1994-05-05
CA2082112C CA2082112C (en) 1996-12-03

Family

ID=4150637

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2082112 Expired - Lifetime CA2082112C (en) 1992-11-04 1992-11-04 Current ratio device and toroidal core assembly therefor

Country Status (1)

Country Link
CA (1) CA2082112C (en)

Also Published As

Publication number Publication date
CA2082112C (en) 1996-12-03

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