US3686567A - Circuit breaker having current transformer with incorporated optical link - Google Patents

Circuit breaker having current transformer with incorporated optical link Download PDF

Info

Publication number
US3686567A
US3686567A US46362A US3686567DA US3686567A US 3686567 A US3686567 A US 3686567A US 46362 A US46362 A US 46362A US 3686567D A US3686567D A US 3686567DA US 3686567 A US3686567 A US 3686567A
Authority
US
United States
Prior art keywords
column
faraday element
chamber
light beam
terminal
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 - Lifetime
Application number
US46362A
Inventor
Lucien Orgeret
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3686567A publication Critical patent/US3686567A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/42—Driving mechanisms
    • H01H33/423—Driving mechanisms making use of an electromagnetic wave communication
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/027—Integrated apparatus for measuring current or voltage

Definitions

  • the [58] Field of Search i 250/217 S Faraday element is connected to the toroidal winding 315/159. 350/156 so as to be subjected to magnetic fields generated by current in the winding.
  • Reflecting mirrors are provided in the column and in the cut-off chamber for [56] References Cited transmitting light beams from the transmitter through UNITED STATES PATENTS the column and cut-off chamber and to the Faraday element. Additional reflecting mirrors are provided to 3,324,393 6/1967 Casey et a1. ..324/96 transmit light beams from the Faraday element back 2,081,839 5/1937 Rankin ..324/96 through the cutoff chamber, the column and then to a photoelectric cell arranged at the base of the column.
  • the invention applies to a circuit breaker involving a hollow insulating column supporting at least one chamber in which are arranged cut-ofi members connected to connection conductors traversing the walls of said chamber in insulating terminals.
  • a polarized light beam emitter arranged at the bottom of the column, means for transmitting the beam to the interior of the column up to the input of an optical Faraday element subjected to the magnetic field created by a coil connected to a toroidal winding in whose axis passes one of the above-mentioned connection conductors, and means for conducting the light beam, coming out of said Faraday element, into the hollow column, up to a photoelectric cell arranged at the base of the column.
  • the magnetic torus is arranged around the output terminal of the connection conductor, which requires it to have a large diameter, and it is therefore expensive to make and it is subject to heavy losses.
  • the circuit breaker according to the invention differs from the above-described known circuit breaker by the fact that the magnetic torus is arranged directly around the connection, conductor. Instead of beingoutside an insulating enclosure, for example, made of porcelain, it is positioned inside the enclosure.
  • This enclosure may be an auxiliary chamber attached to the cut-off chamber or it may be made up of the cutoff chamber itself, with the input and output light beams then running parallel to the contact pieces arranged in the chamber or even inside the contact pieces, if the latter are hollow.
  • the circuit breaker according to the invention may involve a single light beam source at the base of the column and reflecting means for sending the beam toward two Faraday elements-magnetic toms assemblies associated respectively, with the two chambers, and to return the output beam of the assemblies toward photoelectric cells.
  • tubes filled with air may be arranged in the column and/or chambers for the passage of the light beams.
  • FIGS. 1 and 2 are elevational views, partly in section and with parts broken away;
  • FIG. 3 is a schematic view showing a first embodiment of this invention.
  • FIG. 4 is an elevational view, partly in section and with parts broken away;
  • FIG. 5 is a schematic view of a second embodiment of the invention.
  • FIG. 6 is an elevational view, partly in section and with parts'broken away, of a third embodiment of the invention.
  • FIG. 1 is apartial cross-section view along axis AB in FIG. 2 and FIG. 2 is a partial cross-section view along axis CD in FIG. 1, showing the first form of the invention with the auxiliary chamber for the transmission of light beams.
  • FIG. 1 refers to a base enclosure supporting a hollow insulating column 2, the latter in turn supporting a lateral cut-off chamber 3 containing the fixed contact piece 4 and the movable contact piece 5 of the circuit breaker, and the control rod system 6 for the movable contact piece.
  • a polarized light emission device designated overall by 7, of a type well known in the art
  • a light reception device designated by 8, comprising, in the known manner, a photoelectric cell associated with an amplifier.
  • the light emission and reception devices, 7 and 8, respectively, are in communication with the enclosure 1 by means of transparent fittings 9 and 10, respectively.
  • the incident light beam from the light emission device 7 is sent into the hollow column 2 by a mirror 11, through a transparent fitting l5, and falls upon a mirror 12 which reflects it into an auxiliary chamber 13, parallel to the cut-off chamber 3.
  • This device comprises, in a known manner, a transparent cylinder 16 made of flint glass, on whose ends are glued, respectively, a polarizer element and an analyzer element, and it is placed in the magnetic field of a coil 17 supplied by a secondary winding of a current transformer 18 in the forms of a toms which, according to the invention, and contrary to the prior art, is arranged directly around a terminal 19, connected to fixed contact 4 of the circuit breaker.
  • the light beam, coming out of the Faraday-effect element, is reflected, by mirrors 20, 21 and 22, to the photoelectric cell of the light reception device 8.
  • FIGS. 4 and 5 show, schematically, one variant of the application of the optical-link current transformer with circuit breaker having two cut-off chambers 3 and 3,, carried by a single column 2.
  • This variant involves a single light beam transmitter, identical to the one in FIG. 1, and which has therefore not been shown here, and an auxiliary enclosure 23 attached to the assembly of the two cut-off chambers.
  • the incident light beam falls upon a semitransparent mirror 24; a portion of said beam is reflected by this mirror 24, by means of another mirror 25, toward a Faraday-effect device, shown schematically at 26, and subjected to the action of a current from the terminal 19, coming out of chamber 3.
  • the other portion of the beam, which has traversed the mirror 24, falls upon a mirror 28 which reflects it back, by means of another mirror 25,, toward a second Faraday-effect device 26,, associated with terminal 19 or chamber 3
  • the beams coming out of the two Faraday-efi'ect devices after reflection by mirrors 29, 29,, fall, respectively, on two mirrors 30, 30,, which send them back toward two beam reception devices identical to the reception device 8 according to FIG. 1, and which therefore are not shown in FIGS. 4 and 5.
  • the light beams are transmitted into the cut-off chamber 3 itself, instead of being transmitted into an auxiliary chamber parallel to the cut-ofl chamber. They are then transmitted parallel to the contact pieces 4 and 5, either outside them or, if said contact pieces are hollow as shown in FIG. 6, inside the latter.
  • tubes filled with air such as 31 shown in FIG. 4, may be arranged in said column, one tube for the outgoing beam and one tube for the return beam.
  • an optical link current transformer comprising a light beam transmitter, arranged at the bottom of said column,
  • said Faraday element means for subjecting said Faraday element to a magnetic field, generated by current in said winding, means for transmitting said light beam to said Faraday element, a photoelectric cell arranged at the base of said column, and means for conducting the light beam coming out of said Faraday element through said column and to said photoelectric cell; the improvement wherein said toroidal winding directly surrounds said terminal, said optical Faraday element is located close to said terminal and said column is filled with a relatively opaque liquid and tubes are arranged in said column for the passage of light beams.
  • said toroidal winding directly surrounds said terminal, said optical Faraday element is located close to said terminal, two cut-off chambers are supported by the insulating column; wherein contact members, terminals, a Faraday element and a toroidal winding are associated with each of said chambers; and wherein a semireflecting mirror is provided for the purpose of reflecting to each chamber the light beam issuing from said transmitter arranged at the bottom of said column, and reflecting mirrors are provided for the purpose of reflecting the output light beams from each of the chambers toward said photoelectric cell arranged at the base of said colurrm.

Landscapes

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

Abstract

A circuit breaker comprising a hollow insulating column, and an insulated cut-off chamber supported by the column and having movable and fixed contact members therein that are connected to terminals. An optical link current transformer is also provided and comprises a polarized light beam transmitter arranged at the bottom of the column which transmits a beam to the interior of the column, an optical Faraday element, and a toroidal winding directly securing one of the terminals connected to the contact members. The Faraday element is connected to the toroidal winding so as to be subjected to magnetic fields generated by current in the winding. Reflecting mirrors are provided in the column and in the cut-off chamber for transmitting light beams from the transmitter through the column and cut-off chamber and to the Faraday element. Additional reflecting mirrors are provided to transmit light beams from the Faraday element back through the cut-off chamber, the column and then to a photoelectric cell arranged at the base of the column.

Description

3 g 1 x12 3 9 6%? 9 a??? J O United States l 3,686,567
Orgeret Aug. 22, 1972 CIRCUIT BREAKER HAVING Primary Examiner-Archie R. Borchelt CURRENT TRANSFORMER WITH Assistant g y INCQRPORATED OPIIQAL LINK i Attorney-Sughrue, Rothwell, Mion, Zinn & Macpeak.
[72] Inventor: Lucien Orgeret, 72 Boulevard Pinel, [57] ABSTRACT 69-Lyon 3e, France A t b ak h n ul crrcur re er comprising a o ow rns atmg [22] June 1970 column, and an insulated cut-off chamber-supported 21 AWL 4 ,3 2 by the column and having movable and fixed contact members therein that are connected to terminals. An optical link current transformer is also provided and Foreign Appliumon Priority Data comprises a polarized light beam transmitter arranged June 13, 1969 France ..-...6919726 at the bottom of the column which transmits a beam to the interior of the column, an optical Faraday ele- 52] us. (:1. ..324/96 250 225 350/150 and wmidal Winding directly Sewing 51 Int. Cl. 1 ozf 1/2 6611. 31/00 the terminals connected to the contact members. The [58] Field of Search i 250/217 S Faraday element is connected to the toroidal winding 315/159. 350/156 so as to be subjected to magnetic fields generated by current in the winding. Reflecting mirrors are provided in the column and in the cut-off chamber for [56] References Cited transmitting light beams from the transmitter through UNITED STATES PATENTS the column and cut-off chamber and to the Faraday element. Additional reflecting mirrors are provided to 3,324,393 6/1967 Casey et a1. ..324/96 transmit light beams from the Faraday element back 2,081,839 5/1937 Rankin ..324/96 through the cutoff chamber, the column and then to a photoelectric cell arranged at the base of the column.
2 Clains, 6 Drawing Figures Patented Aug. 22, 1972 3 Sheets-Sheet 1 atented Aug. 22, 1972 3 Sheets-Sheet 2 FIG3 Patented Aug. 22, 1972 3 Sheets-Sheet 5 CIRCUIT BREAKER HAVING CURRENT TRANSFORMER WITH INCORPORATED OPTICAL LWK BACKGROUND OF THE INVENTION This invention relates to an electrical circuit breaker involving a current transformer with incorporated optical link.
The invention applies to a circuit breaker involving a hollow insulating column supporting at least one chamber in which are arranged cut-ofi members connected to connection conductors traversing the walls of said chamber in insulating terminals.
It is known, for example, on the basis of US. Pat. No. 3,324,393, that one can associate a circuit breaker, thus constituted, with an optical current transformer involving the following elements:
A polarized light beam emitter, arranged at the bottom of the column, means for transmitting the beam to the interior of the column up to the input of an optical Faraday element subjected to the magnetic field created by a coil connected to a toroidal winding in whose axis passes one of the above-mentioned connection conductors, and means for conducting the light beam, coming out of said Faraday element, into the hollow column, up to a photoelectric cell arranged at the base of the column.
However, in such a circuit breaker, the magnetic torus is arranged around the output terminal of the connection conductor, which requires it to have a large diameter, and it is therefore expensive to make and it is subject to heavy losses.
SUMMARY OF THE INVENTION The circuit breaker according to the invention differs from the above-described known circuit breaker by the fact that the magnetic torus is arranged directly around the connection, conductor. Instead of beingoutside an insulating enclosure, for example, made of porcelain, it is positioned inside the enclosure.
This enclosure may be an auxiliary chamber attached to the cut-off chamber or it may be made up of the cutoff chamber itself, with the input and output light beams then running parallel to the contact pieces arranged in the chamber or even inside the contact pieces, if the latter are hollow.
In the case where two cut-off chambers are supported by the same insulating column, the circuit breaker according to the invention may involve a single light beam source at the base of the column and reflecting means for sending the beam toward two Faraday elements-magnetic toms assemblies associated respectively, with the two chambers, and to return the output beam of the assemblies toward photoelectric cells.
Likewise, according to the invention, when the column and/or the cut-off chambers are filled with a relatively opaque liquid, such as oil, tubes filled with air may be arranged in the column and/or chambers for the passage of the light beams.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are elevational views, partly in section and with parts broken away;
FIG. 3 is a schematic view showing a first embodiment of this invention;
FIG. 4 is an elevational view, partly in section and with parts broken away;
FIG. 5 is a schematic view of a second embodiment of the invention; and
FIG. 6 is an elevational view, partly in section and with parts'broken away, of a third embodiment of the invention.
FIG. 1 is apartial cross-section view along axis AB in FIG. 2 and FIG. 2 is a partial cross-section view along axis CD in FIG. 1, showing the first form of the invention with the auxiliary chamber for the transmission of light beams.
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, and particularly in FIGS. 1 and 2, FIG. 1 refers to a base enclosure supporting a hollow insulating column 2, the latter in turn supporting a lateral cut-off chamber 3 containing the fixed contact piece 4 and the movable contact piece 5 of the circuit breaker, and the control rod system 6 for the movable contact piece.
To the base enclosure 1 there are connected, on the one hand, a polarized light emission device, designated overall by 7, of a type well known in the art, and, on the other hand, a light reception device, designated by 8, comprising, in the known manner, a photoelectric cell associated with an amplifier.
The light emission and reception devices, 7 and 8, respectively, are in communication with the enclosure 1 by means of transparent fittings 9 and 10, respectively.
The incident light beam from the light emission device 7 is sent into the hollow column 2 by a mirror 11, through a transparent fitting l5, and falls upon a mirror 12 which reflects it into an auxiliary chamber 13, parallel to the cut-off chamber 3.
At the end of this chamber 13, the beam is reflected by a mirror 14 in the input of a Faraday-effect element, as shown in FIG. 3. This device comprises, in a known manner, a transparent cylinder 16 made of flint glass, on whose ends are glued, respectively, a polarizer element and an analyzer element, and it is placed in the magnetic field of a coil 17 supplied by a secondary winding of a current transformer 18 in the forms of a toms which, according to the invention, and contrary to the prior art, is arranged directly around a terminal 19, connected to fixed contact 4 of the circuit breaker.
The light beam, coming out of the Faraday-effect element, is reflected, by mirrors 20, 21 and 22, to the photoelectric cell of the light reception device 8.
FIGS. 4 and 5 show, schematically, one variant of the application of the optical-link current transformer with circuit breaker having two cut-off chambers 3 and 3,, carried by a single column 2.
This variant involves a single light beam transmitter, identical to the one in FIG. 1, and which has therefore not been shown here, and an auxiliary enclosure 23 attached to the assembly of the two cut-off chambers.
In this auxiliary enclosure, the incident light beam falls upon a semitransparent mirror 24; a portion of said beam is reflected by this mirror 24, by means of another mirror 25, toward a Faraday-effect device, shown schematically at 26, and subjected to the action of a current from the terminal 19, coming out of chamber 3. The other portion of the beam, which has traversed the mirror 24, falls upon a mirror 28 which reflects it back, by means of another mirror 25,, toward a second Faraday-effect device 26,, associated with terminal 19 or chamber 3 The beams coming out of the two Faraday-efi'ect devices, after reflection by mirrors 29, 29,, fall, respectively, on two mirrors 30, 30,, which send them back toward two beam reception devices identical to the reception device 8 according to FIG. 1, and which therefore are not shown in FIGS. 4 and 5.
Inanother variant, the light beams are transmitted into the cut-off chamber 3 itself, instead of being transmitted into an auxiliary chamber parallel to the cut-ofl chamber. They are then transmitted parallel to the contact pieces 4 and 5, either outside them or, if said contact pieces are hollow as shown in FIG. 6, inside the latter.
Finally, it must be noted that, in the case where the column 2 is filled with a fluid that is opaque, for example, oil, tubes filled with air, such as 31 shown in FIG. 4, may be arranged in said column, one tube for the outgoing beam and one tube for the return beam.
I claim:
1. In an electrical circuit breaker comprising:
a hollow insulating column,
an insulated cut-off chamber supported at one of its ends by said column and having movable and fixed contact members therein,
at least one terminal connected to said contact members at the other end of said chamber, an optical link current transformer comprising a light beam transmitter, arranged at the bottom of said column,
means for transmitting this beam to the interior of said column,
an optical Faraday element,
a toroidal winding surrounding said terminal,
means for subjecting said Faraday element to a magnetic field, generated by current in said winding, means for transmitting said light beam to said Faraday element, a photoelectric cell arranged at the base of said column, and means for conducting the light beam coming out of said Faraday element through said column and to said photoelectric cell; the improvement wherein said toroidal winding directly surrounds said terminal, said optical Faraday element is located close to said terminal and said column is filled with a relatively opaque liquid and tubes are arranged in said column for the passage of light beams.
2. In an electrical circuit breaker comprising:
a hollow insulating column,
an insulated cut-ofi chamber supported at one of its a toroidal windin surroundin said terminal, means for subjec rig said Far day element to a mag netic field generated by current in said winding,
means for transmitting said light beam to said Faraday element,
a photoelectric cell arranged at the base of said column, and
means for conducting the light beam coming out of said Faraday element through said column and to said photoelectric cell; the improvement wherein said toroidal winding directly surrounds said terminal, said optical Faraday element is located close to said terminal, two cut-off chambers are supported by the insulating column; wherein contact members, terminals, a Faraday element and a toroidal winding are associated with each of said chambers; and wherein a semireflecting mirror is provided for the purpose of reflecting to each chamber the light beam issuing from said transmitter arranged at the bottom of said column, and reflecting mirrors are provided for the purpose of reflecting the output light beams from each of the chambers toward said photoelectric cell arranged at the base of said colurrm.

Claims (2)

1. In an electrical circuit breaker comprising: a hollow insulating column, an insulated cut-off chamber supported at one of its ends by said column and having movable and fixed contact members therein, at least one terminal connected to said contact members at the other end of said chamber, an optical link current transformer comprising a light beam transmitter, arranged at the bottom of said column, means for transmitting this beam to the interior of said column, an optical Faraday element, a toroidal winding surrounding said terminal, means for subjecting said Faraday element to a magnetic field generated by current in said winding, means for transmitting said light beam to said Faraday element, a photoelectric cell arranged at the base of said column, and means for conducting the light beam coming out of said Faraday element through said column and to said photoelectric cell; the improvement wherein said toroidal winding directly surrounds said terminal, said optical Faraday element is located close to said terminal and said column is filled with a relatively opaque liquid and tubes are arranged in said column for the passage of light beams.
2. In an electrical circuit breaker comprising: a hollow insulating column, an insulated cut-off chamber supported at one of its ends by said column and having movable and fixed contact members therein, at least one terminal connected to said contact members at the other end of said chamber, an optical link current transformer comprising a light beam transmitter, arranged at the bottom of said column, means for transmitting this beam to the interior of said column, an optical Faraday element, a toroidal winding surrounding said terminal, means for subjecting said Faraday element to a magnetic field generated by current in said winding, means for transmitting said light beam to said Faraday element, a photoelectric cell arranged at the base of said column, and means for conducting the light beam coming out of said Faraday element through said column and to said photoelectric cell; the improvement wherein said toroidal winding directly surrounds said terminal, said optical Faraday element is located close to said terminal, two cut-off chambers are supported by the insulating column; wherein contact members, terminals, a Faraday element and a toroidal winding are associated with each of said chambers; and wherein a semireflecting mirror is provided for the purpose of reflecting to each chamber the light beam issuing from said transmitter arranged at the bottom of said column, and reflecting mirrors are provided for the purpose of reflecting the output light beams from each of the chambers toward said photoelectric cell arranged at the base of said column.
US46362A 1969-06-13 1970-06-15 Circuit breaker having current transformer with incorporated optical link Expired - Lifetime US3686567A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6919726A FR2049596A5 (en) 1969-06-13 1969-06-13

Publications (1)

Publication Number Publication Date
US3686567A true US3686567A (en) 1972-08-22

Family

ID=9035717

Family Applications (1)

Application Number Title Priority Date Filing Date
US46362A Expired - Lifetime US3686567A (en) 1969-06-13 1970-06-15 Circuit breaker having current transformer with incorporated optical link

Country Status (2)

Country Link
US (1) US3686567A (en)
FR (1) FR2049596A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000008664A1 (en) * 1998-08-06 2000-02-17 Abb T & D Technology Ltd Pole of a circuit breaker with an integrated optical current sensor
EP2784893B1 (en) 2013-03-29 2015-12-09 Alstom Technology Ltd Busbar protection against faults between circuit breaker and current transformer
EP2880669B1 (en) 2012-08-02 2016-07-20 General Electric Technology GmbH Disconnector for high voltage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29806355U1 (en) * 1998-03-31 1998-06-10 Siemens Ag High-voltage device, in particular surge arresters

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2081839A (en) * 1935-11-13 1937-05-25 Gen Electric High-voltage current-responsive apparatus
US3324393A (en) * 1963-07-26 1967-06-06 Gen Electric Magneto-optical electric current sensing arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2081839A (en) * 1935-11-13 1937-05-25 Gen Electric High-voltage current-responsive apparatus
US3324393A (en) * 1963-07-26 1967-06-06 Gen Electric Magneto-optical electric current sensing arrangement

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000008664A1 (en) * 1998-08-06 2000-02-17 Abb T & D Technology Ltd Pole of a circuit breaker with an integrated optical current sensor
US6608481B1 (en) * 1998-08-06 2003-08-19 Abb T & D Technology Ltd. Pole of a circuit breaker with an integrated optical current sensor
AU766689B2 (en) * 1998-08-06 2003-10-23 Abb T & D Technology Ltd Pole of a circuit breaker with an integrated optical current sensor
EP2880669B1 (en) 2012-08-02 2016-07-20 General Electric Technology GmbH Disconnector for high voltage
EP2880669B2 (en) † 2012-08-02 2019-10-16 General Electric Technology GmbH Disconnector for high voltage
EP2784893B1 (en) 2013-03-29 2015-12-09 Alstom Technology Ltd Busbar protection against faults between circuit breaker and current transformer

Also Published As

Publication number Publication date
FR2049596A5 (en) 1971-03-26

Similar Documents

Publication Publication Date Title
US4148558A (en) Optical transmission line by-pass relay
US1963185A (en) Phototube
US2306137A (en) Stress determining device
US3419803A (en) Apparatus for current measurement by means of the faraday effect
US3686567A (en) Circuit breaker having current transformer with incorporated optical link
US2207097A (en) Light sensitive device
US3590374A (en) Current measuring apparatus utilizing combined rotational effects of two or more faraday elements
EP0849600A1 (en) Optical current transformer
US3597683A (en) Current transformer utilizing an electromagnetic wave, a faraday rotator, circular waveguides, horn antennae, and mode converters to measure current in a high voltage transmission line
US3411069A (en) Capacitive volage transformer and current transformer combination unit
AU766689B2 (en) Pole of a circuit breaker with an integrated optical current sensor
US3502978A (en) Magneto-optical voltage measuring device utilizing polarized light
Saito et al. 12.4-Development of the laser current transformer for the extra-high-voltage power transmission lines
GB1026061A (en) Improvements in or relating to plasma tube arrangements
JP3347449B2 (en) Optical current measuring device
CN208672999U (en) A kind of polarization-maintaining rare-earth doped optical fibre amplifier
US3244834A (en) Electromagnetic miniature relay
US2048237A (en) X-ray apparatus
US1680420A (en) Galvanometer
JPS6346986Y2 (en)
JPH0611470Y2 (en) Optical current transformer for gas insulated switchgear
JPS6396566A (en) Gas insulating current transformer
JPH07234252A (en) Optical current measuring device
SU681540A1 (en) Magnetic modulator
JPS60202365A (en) Gas-insulated electrical appliance