GB1207540A - Apparatus for responding to a magnetic field or to an electric current producing a magnetic field - Google Patents

Apparatus for responding to a magnetic field or to an electric current producing a magnetic field

Info

Publication number
GB1207540A
GB1207540A GB5227667A GB5227667A GB1207540A GB 1207540 A GB1207540 A GB 1207540A GB 5227667 A GB5227667 A GB 5227667A GB 5227667 A GB5227667 A GB 5227667A GB 1207540 A GB1207540 A GB 1207540A
Authority
GB
United Kingdom
Prior art keywords
current
beams
proportional
measured
magnetic field
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.)
Expired
Application number
GB5227667A
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.)
Compteurs Schlumberger SA
Original Assignee
Compteurs Schlumberger SA
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
Priority claimed from FR84946A external-priority patent/FR1508357A/en
Application filed by Compteurs Schlumberger SA filed Critical Compteurs Schlumberger SA
Publication of GB1207540A publication Critical patent/GB1207540A/en
Expired 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
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
    • G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

1,207,540. Photo-electric current measurement. COMPAGNIE DES COMPTEURS Nov. 16, 1967 [Nov. 25, 1966; Feb.7, 1967], No.52276/67. Headings G1A and G1U. In a system for measuring the current in a high voltage transmission line, where the current, or a current proportional to it, rotates the plane of polarization of a light beam by the Faraday effect, two polarized beams are rotated by the current in opposite directions and received via analysers upon respective photo-cells connected in a differential arrangement. The present system avoids interference from outside magnetic fields and variations in the light source or sources producing the beams. In a null-arrangement Fig. 1 two beams polarized by polarizers 11 and 21 are rotated in opposite directions by first optical elements 12, 22 whose windings are energized by a current proportional to the one being measured. The beams are rotated back by optical elements 13, 23 whose windings are traversed by current proportional to the difference in the two photoelectric voltages generated by photo-cells 15 and 25 on which the two beams finally arrive after passing through analysers 14 and 24. The current through the windings of elements 13 and 27 is proportional to the current being measured and is indicated at 9. In another arrangement Fig. 3 (not shown) the light beams of equal intensity are generated by diodes and intensity modulated at a frequency proportional to the level of current being measured. This frequency modulation appearing in the differential detector circuit is detected as an additional measurement of the current. In another arrangement Fig. 2 (not shown) optical elements 12 and 22 have no windings but are placed either side of the conductor through which the current being measured flows so that the elements are influenced by the magnetic field of the conductor.
GB5227667A 1966-11-25 1967-11-16 Apparatus for responding to a magnetic field or to an electric current producing a magnetic field Expired GB1207540A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR84946A FR1508357A (en) 1966-11-25 1966-11-25 Astatic optical device for transmitting an electrical signal
FR93900A FR92558E (en) 1966-11-25 1967-02-07 Astatic optical device for transmitting an electrical signal

Publications (1)

Publication Number Publication Date
GB1207540A true GB1207540A (en) 1970-10-07

Family

ID=26174276

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5227667A Expired GB1207540A (en) 1966-11-25 1967-11-16 Apparatus for responding to a magnetic field or to an electric current producing a magnetic field

Country Status (5)

Country Link
CH (1) CH485228A (en)
DE (1) DE1591870A1 (en)
FR (1) FR92558E (en)
GB (1) GB1207540A (en)
SE (1) SE338364B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923803A1 (en) * 1989-07-19 1991-01-31 Messwandler Bau Ag FIBER OPTICAL ARRANGEMENT FOR MEASURING THE STRENGTH OF AN ELECTRIC CURRENT

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2461956A1 (en) * 1979-07-24 1981-02-06 Thomson Csf INTERFEROMETRIC DEVICE FOR MEASURING ELECTRICAL CURRENT WITH OPTICAL FIBER
US5780845A (en) * 1995-04-25 1998-07-14 Toshihiko Yoshino Optical current transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923803A1 (en) * 1989-07-19 1991-01-31 Messwandler Bau Ag FIBER OPTICAL ARRANGEMENT FOR MEASURING THE STRENGTH OF AN ELECTRIC CURRENT

Also Published As

Publication number Publication date
DE1591870A1 (en) 1970-10-01
SE338364B (en) 1971-09-06
FR92558E (en) 1968-11-29
CH485228A (en) 1970-01-31

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees