GB1170540A - Current Detector - Google Patents

Current Detector

Info

Publication number
GB1170540A
GB1170540A GB3787167A GB3787167A GB1170540A GB 1170540 A GB1170540 A GB 1170540A GB 3787167 A GB3787167 A GB 3787167A GB 3787167 A GB3787167 A GB 3787167A GB 1170540 A GB1170540 A GB 1170540A
Authority
GB
United Kingdom
Prior art keywords
current
bodies
detector
conductor
light
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
GB3787167A
Inventor
Brian Arthur Evans
Ronald Ferguson Pearson
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB3787167A priority Critical patent/GB1170540A/en
Priority to NL6811525A priority patent/NL6811525A/xx
Priority to DE19681766938 priority patent/DE1766938A1/en
Priority to FR1576994D priority patent/FR1576994A/fr
Publication of GB1170540A publication Critical patent/GB1170540A/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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect

Landscapes

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

Abstract

1,170,540. Current measuring. MULLARD Ltd. July 18, 1968 [Aug. 17, 1967], No.37871/67. Headings G1A and G1U. In a system for measuring current on a high voltage conductor C by using the Faraday effect, interference effects caused by current in an adjacent conductor TC are reduced by using two spaced Faraday effect bodies Y1, Y2 spaced in the field of the current to be measured, a plane polarized infrared beam being passed through the two bodies in turn in such a direction that the effects on the two bodies of the field due to the adjacent current effectively cancel. In one system infrared light is directed via a fibre optic FO1 to a polariser P1 through one body Y1 and is then reflected by two mirrors (to give 360 degrees phase change) through the second body Y2 analyser P2, fibre optic FO2 to a detector D. The current being measued may be a very high A. C. which will result in a modulated output from the detector which must be demodulated. Alternatively A.C. may be measured, in which case the effect of attenuation in the light path is reduced by inserting a further body to which a reference A. C. is applied and determining the depth of modulation at the detector, which represents the ratio of the reference A.C. to the unknown D.C. In alternative arrangements, both Faraday bodies may be between the conductors C and IC Fig. 3 (not shown) and the system of mirrors M1, M2 may be replaced by a U-shaped light guide Fig. 5 (not shown), a further analyser and polarizer being inserted in the light path since such a guide will cause the loss of any polarization information in the light passing into it. The provisional Specification describes an arrangement using any one magneto optic body set in a magnetic shield surrounding the test conductor to reduce external interference effects.
GB3787167A 1967-08-17 1967-08-17 Current Detector Expired GB1170540A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB3787167A GB1170540A (en) 1967-08-17 1967-08-17 Current Detector
NL6811525A NL6811525A (en) 1967-08-17 1968-08-14
DE19681766938 DE1766938A1 (en) 1967-08-17 1968-08-16 Current detector
FR1576994D FR1576994A (en) 1967-08-17 1968-08-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3787167A GB1170540A (en) 1967-08-17 1967-08-17 Current Detector

Publications (1)

Publication Number Publication Date
GB1170540A true GB1170540A (en) 1969-11-12

Family

ID=10399604

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3787167A Expired GB1170540A (en) 1967-08-17 1967-08-17 Current Detector

Country Status (4)

Country Link
DE (1) DE1766938A1 (en)
FR (1) FR1576994A (en)
GB (1) GB1170540A (en)
NL (1) NL6811525A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649931A (en) * 1969-11-03 1972-03-14 Sperry Rand Corp Compensated frequency biasing system for ring laser
US3810013A (en) * 1971-06-11 1974-05-07 Siemens Ag Electro-optical device for measuring the voltage on a high-voltage conductor
US4126825A (en) * 1977-10-25 1978-11-21 Electric Power Research Institute, Inc. Electronic current transducer for high voltage transmission lines
WO2008065196A2 (en) * 2006-11-30 2008-06-05 North Sensor A/S Faraday effect current sensor
EP2919022A3 (en) * 2007-11-30 2015-10-21 PowerSense A/S Sensor assembly and method for measuring strokes of lightning

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649931A (en) * 1969-11-03 1972-03-14 Sperry Rand Corp Compensated frequency biasing system for ring laser
US3810013A (en) * 1971-06-11 1974-05-07 Siemens Ag Electro-optical device for measuring the voltage on a high-voltage conductor
US4126825A (en) * 1977-10-25 1978-11-21 Electric Power Research Institute, Inc. Electronic current transducer for high voltage transmission lines
WO2008065196A2 (en) * 2006-11-30 2008-06-05 North Sensor A/S Faraday effect current sensor
WO2008065196A3 (en) * 2006-11-30 2008-12-11 North Sensor As Faraday effect current sensor
US8692539B2 (en) 2006-11-30 2014-04-08 Powersense A/S Faraday effect current sensor
EP2919022A3 (en) * 2007-11-30 2015-10-21 PowerSense A/S Sensor assembly and method for measuring strokes of lightning

Also Published As

Publication number Publication date
DE1766938A1 (en) 1971-09-16
FR1576994A (en) 1969-08-01
NL6811525A (en) 1969-02-19

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