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WO2002021657A1 - Systeme capteur de lumiere a fibres optiques - Google Patents

Systeme capteur de lumiere a fibres optiques Download PDF

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Publication number
WO2002021657A1
WO2002021657A1 PCT/US2001/019022 US0119022W WO0221657A1 WO 2002021657 A1 WO2002021657 A1 WO 2002021657A1 US 0119022 W US0119022 W US 0119022W WO 0221657 A1 WO0221657 A1 WO 0221657A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
fiber optic
cable
sensing section
signal
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.)
Ceased
Application number
PCT/US2001/019022
Other languages
English (en)
Inventor
H. Bruce Land, Iii.
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.)
Johns Hopkins University
Original Assignee
Johns Hopkins University
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 Johns Hopkins University filed Critical Johns Hopkins University
Priority to AU2001268387A priority Critical patent/AU2001268387A1/en
Publication of WO2002021657A1 publication Critical patent/WO2002021657A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • G01J1/0425—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using optical fibers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/0228—Control of working procedures; Failure detection; Spectral bandwidth calculation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H02H1/0015—Using arc detectors
    • H02H1/0023—Using arc detectors sensing non electrical parameters, e.g. by optical, pneumatic, thermal or sonic sensors

Definitions

  • the present invention relates to light detectors and is directed more particularly to a fiber optic light sensor system where light enters a sensing section along a fiber optic cable and is coupled into the cable.
  • a typical circuit breaker will generally not trip fast enough during an arc fault to minimize damage.
  • the high resistance of an arc fault often causes the arcing current to be below the instantaneous magnetic trip threshold of most circuit breakers.
  • the intermittent quality of an arcing fault can create an average RMS current value that is below the thermal threshold of the circuit breaker.
  • Numerous solid state, electro-mechanical, and optical systems are therefore available to detect such arcs and trigger circuit breakers in the shortest time possible, disconnecting the power source and minimizing the magnitude and duration of the arcs.
  • the solid state and electro-mechanical arc detection systems use various techniques to distinguish nefarious arcing currents from innocuous arcing currents caused by equipment such as brush motors.
  • a microprocessor is used to identify electrical signature characteristics of unintended and dangerous arcs. If the system detects such characteristics, for example, random occurrences of high frequency current spikes, then a solenoid is used to immediately trip a circuit breaker.
  • optical arc-detection systems that detect arcs directly at their source have proven to be the best and fastest means for detecting arcs.
  • Some of these systems aim the end of a fiber optic cable at an area susceptible to arcing. Light from an electrical arc enters the end of the cable and triggers a solenoid that opens a circuit breaker.
  • a significant limitation of these systems concerns the relatively narrow field-of-view of the individual cables. Wide-angle lenses are often attached to the ends of the cables to improve the field-of-view.
  • multiple cables must often be arranged inside an equipment enclosure to ensure that at least one cable is positioned to receive light from each of the various locations where arcing may occur.
  • the present invention presents a solution to the aforementioned problems associated with prior art electrical arc detection systems and with general prior art light detection systems.
  • the present invention is directed to a fiber optic light sensor that employs a fiber optic cable having a core and an annular jacket, the annular jacket covering the core along a jacketed section of the cable; however, unlike sensors used in the prior art that receive light through the ends of a cable, the present invention includes a bare sensing section along the length of the cable where the core is not covered by the jacket.
  • a photo detector is coupled to one end of the cable and detects a light signal that enters the cable at the sensing section. Signal processing instrumentation connected to the photo detector then processes the light signal.
  • Advantages of particular embodiments of the present invention include the ability to detect light 360 degrees around the circumference of the cable.
  • the use of a fiber optic cable provides electrical, mechanical, thermal, and environmental isolation from the area surrounding the light source. This allows the placement of a sensing section in direct contact with high voltage circuits that could destroy signal processing instrumentation. It also allows placement of the sensing section in locations of high vibration, high or low temperature, and in corrosive or wet environments that could harm electronics. Further, use of a fiber optic cable enables placement of the sensing section in tight locations where an electronics package would not fit.
  • Fiber optic cables are also less expensive than electronic instrumentation and can be used as a disposable item. Additionally, fiber optic cables are totally immune to electromagnetic energy and many electronics packages are not. [0011] It is therefore an object of the present invention to provide an improved light sensing system in regard to range of viewing angle effectiveness, environmental isolation, adaptability for use in tight spaces, and cost.
  • Another object of the present invention is to provide an improved light sensing system that includes a Built-in-Test (BIT) feature.
  • BIT Built-in-Test
  • FIG. 1 is a cross-section view of a typical fiber optic cable.
  • FIG. 2 is a schematic diagram of one embodiment of the present invention.
  • FIG. 3 is a schematic circuit diagram of one embodiment of the signal processing instrumentation of the present invention.
  • FIG. 4 is a schematic diagram of one embodiment of the Built-in-Test (BIT) electronics of the present invention.
  • FIG. 5 is a schematic diagram of one embodiment of the present invention employing the BIT feature.
  • FIGS. 6 A and 6B are schematic diagrams of the BIT features of the present invention as used in conjunction with prior art fiber optic light sensors.
  • FIGS. 7A and 7B are cross-sectional and top views, respectively, of one embodiment of the present invention that functions as a light safety curtain.
  • FIG. 1 is a cross section view of a typical fiber optic cable.
  • a core 10 is made of glass or plastic and surrounded by a cladding 12 and a jacket 14.
  • Fiber optic communication is based upon injecting light into one end of the core 0 and receiving it out of the other end of the core 10. Any light that is injected into the fiber core 10 and strikes the core-to-cladding interface at greater than a "critical angle" reflects back into the core.
  • the critical angle is defined as the angle of incidence at which a refracted light ray points along the surface of the cable, the angle of refraction being 90 degrees.
  • Fiber optic cables are designed to exploit this phenomenon by causing light rays that are coupled into the fiber to strike the core-to-cladding interface at greater than the critical angle. The light is thus reflected repeatedly with minimal energy loss and propagates down the fiber. Stray light rays that strike the interface at less than the critical angle pass into the cladding 12 where they are attenuated and absorbed by the jacket 14. Since the primary application of fiber optic cables is to efficiently transmit light, light is normally coupled into the end of the core 10 where the coupling is most efficient; i.e., where most of the introduced light rays strike the core-to- cladding interface at greater than the critical angle.
  • FIG. 2 is a schematic diagram of one embodiment of the present invention where the jacket 14 of a continuous fiber optic cable is selectively removed to create one or more bare sensing sections 16 to admit light and act as a sensor/detector in multiple desired locations.
  • the sensing sections 16 are routed around the inside of metal enclosures 18 where electrical switchgear is housed.
  • the sensing sections 16 are intended to detect electrical arcs inside the enclosures 18 that can destroy equipment and start fires.
  • the cable outside of the enclosures 18 include jacketed sections 20 to shield the core 10 from extraneous light signals.
  • Light 27 from a sensed event is then transmitted over a distance to a photo detector 26 and related signal processing instrumentation 24.
  • the signal processing instrumentation 24 may in turn send a signal to an interface such as a computer 25 or an alarm panel.
  • a cable with a clear jacket 14 can be used in the sensing section 16 and an opaque jacket 14 can be applied to create the jacketed section 20.
  • a fiber with a clear jacket 14 can be used as the sensing section 16 in the desired location and optical connectors can connect the sensing section 16 to an opaque jacketed section 20.
  • bare optical fiber can be used throughout the system and sleeved with tubing to form the jacketed sections 20.
  • the present invention is applicable to fiber optic cables having either glass or plastic cores 10, and may be used with various types of cladding 12 and jackets 14. Further, the cables may operate in single mode or multimode transmission.
  • Prior art fiber optic sensors admit light through one end of the cable. As mentioned above, this limits both the amount of light that can be admitted and the angle-of-view.
  • the use of a sensing section 16 along the length of the cable allows one to detect light continuously along the length of the cable or at any given point where the cladding 12 is exposed.
  • a single fiber optic cable can then be routed around objects to detect light over broad areas with a 360-degree field-of-view. This eliminates the need for multiple expensive electronics packages to support multiple fiber optic detectors.
  • the sensing sections 16 are also effective in tight quarters where the prior art sensors would not work.
  • the photo detector 26 can be a phototransistor, a photo Darlington, a photodiode, or other type of light detector.
  • one side of the detector 26 is connected to a positive DC voltage and the other side to ground through a resistor 28.
  • the resistor 28 is set to bias detector 26 in its operating range.
  • the value of resistor 28 can vary depending upon the type of detector 26 used and the magnitude of the DC voltage.
  • the DC voltage is typically 5 NDC, but could be any value.
  • the change in light on the surface of the detector 26 causes the amount of current passing through the detector 26 to vary.
  • the ratio of resistor 32 and resistor 34 set the gain of amplifier chip 30 by the textbook op-amp equation that is well known in the art.
  • the gain value is selected based upon the fiber optic cable type, cable length, and the amplitude of the light to be detected.
  • the capacitor 36 sets the cutoff frequency of amplifier chip 30. This is useful to prevent high frequency oscillations of the output and to filter noise. While the amplifier chip 30 shown is a non-inverting amplifier, an inverting amplifier works just as well and adjustments to the circuit may be made accordingly.
  • a reference voltage for the comparator 38 is supplied by a voltage divider, made up of resistor 40, variable resistor 42 and resistor 44.
  • the reference voltage sets the threshold level at which the comparator 38 output changes state.
  • the trip point is easily varied by selecting different values for the resistors or by the adjustment of variable resistor 42.
  • the combination of resistor 46 and resistor 48 add hysteresis to the comparator 38.
  • the output of the comparator 38 is pulled up to the plus voltage by resistor 50. If light is present at the detector 26, the input to the + pin on the comparator 38 will be high. If the voltage input to the + pin is higher than that to the - pin then the output of the comparator 38 will be high.
  • the output of the comparator 38 will toggle between on and off, based upon the presence or absence of light, it can be used to drive an alarm device 52, for triggering an appropriate response to a light signal, such as a visual or audible alarm or a relay that can control some external device such as a circuit breaker.
  • a light signal such as a visual or audible alarm or a relay that can control some external device such as a circuit breaker.
  • embodiments of the invention can also include a node 54 that furnishes an analog output that is proportional to the amount of light seen by the detector 26. This output can be fed to a meter or other analog devices.
  • the analog output from amplifier chip 30 is connected to the input of an analog to digital (A/D) converter 56.
  • the A/D converter 56 will convert the varying analog output of the node 54 into a varying digital output that can be connected to the computer 25 shown in FIG. 2.
  • This varying output can be used to detect different types of sensed light events. For example, referring again to FIG. 2, different types of light events could be indicative of specific and important parameters of this system. Perhaps the inside of the electronic enclosure 18 is dark when the door is properly closed.
  • the BIT electronics 57 include a light source 58, such as but not limited to a laser diode or Light Emitting Diode (LED), for performing a BIT to determine if the system is functional.
  • the light source 58 can be located at a distal end of the fiber optic cable.
  • An AND gate 60 toggles the light source 58 output under manual or automatic control to send an on/off signal to the signal processing instrumentation 24 that provides a pass/fail test of the cable from end-to-end.
  • the output will go high which will turn on the light source 58.
  • the resistor 68 is used to set the current and govern the brightness of the light source 58. When either of the two inputs 64 and 66 go low the light source 58 will turn off.
  • the signals to AND gate 60 can be furnished by a switch or by computer control.
  • a digital to analog (D/A) converter 62 with a variable input can be coupled to the system to help determine a level of contamination (e.g., dirt, dust or grease) on the sensing section 16 of the cable.
  • contamination e.g., dirt, dust or grease
  • the analog or digital output of the signal processing instrumentation 24 will also vary in a known fashion. Any deviation from a predicted output can be used to calculate the contamination on the sensor section 16 and thus predict system degradation as well as perform a go/no go test. The system can also alert an operator as to when cleaning of the sensor section 16 is necessary.
  • FIG. 5 is a schematic of one embodiment of the present invention employing the BIT feature shown in FIG. 4 where the distal end of the fiber optic cable is routed back near the signal processing instrumentation 24. This enables the BIT electronics 57 to be packaged together with the photo detector 26 and the signal processing instrumentation 24.
  • the above described BIT features of the present invention may also be used in conjunction with prior art fiber optic sensors. Referring to FIG. 6A, when used with prior art sensors that employ a lens 70 on the end of a sensing fiber optic cable 72, the BIT feature of the present invention may be used by adding a second BIT fiber optic cable 74. Light from the light source 58 enters the BIT fiber optic cable 74 and is reflected from the back surface of the lens 70.
  • the reflected light then enters the sensing fiber optic cable 72 and is detected.
  • a fixed input AND gate 60 or a variable input D/A converter 62 may be used to provide a pass/fail test of the prior art sensor system from end-to-end.
  • the amount of light reflected from the lens 70 will vary with the amount and type of contamination on the outside surface of the lens. It is presumed that the inside surface is in a sealed environment and will not change.
  • the BIT features of the present invention may be used with prior art sensors without the addition of the BIT cable 74.
  • the light source 58 is coupled to the sensing cable 72 by adding a beam splitter 76 at the photo detector 26 end of the sensing cable 72.
  • the beam splitter 76 allows the light source 58 to be coupled into the sensing cable 72 upon command. When the light is reflected back from the lens 70 it is detected by the photo detector 26 as described above.
  • Selective coatings can also be applied to the lens 70 that allow all wavelengths of light to pass through the lens 70 except the narrow wavelengths of the light source 58. This does not impede the ability of the photo detector 26 to detect light from the event of interest; rather it enhances the reflection of the BIT light source 58 into the sensing cable 72 and gives the BIT feature a much higher signal-to-noise ratio.
  • the above-described techniques of the present invention can be used wherever changes in light need to be sensed. For example, the present invention can be used to sense excessive arcing on the brushes of motors that may be an indication of premature wear.
  • the system can also be used to sense the presence of arcing in electrical distribution system components such a transformers, power supplies, switchboards, substation panels, load centers, switch panels, and circuit breaker panels.
  • the system can also be imbedded in any critical electrical enclosure such as a large computer. Further, the system is useful wherever ultra reliable electrical power is needed. This includes the main power feed switchboards for hospitals, semiconductor production lines, computer server farms, etc.
  • the BIT features of the present invention allow end-to-end testing of the system without need for access to each component.
  • Security systems that use the presence of light to determine a breach in security can also benefit from the BIT features.
  • Equipment where the opening of a cover would present a substantial hazard might benefit from the use of the present invention with the BIT features.
  • a single sensing section 16 could have five functions: 1) no light would mean the cover is closed; 2) a medium light would mean the cover is open; 3) a pulsed light would mean the BIT feature is active; 4) pulsing different amplitudes of BIT light source 58 would determine if the sensing section 16 is clean; and 5) a strong light would mean an arc fault is present.
  • Still another application of the present invention concerns use of the sensing section 16 to create a "light safety curtain.”
  • Prior art light safety curtains are presently used to shut off equipment such as drills, mills, lathes, etc., if an operator tries to reach toward the equipment while it is running.
  • Such prior art light safety curtains require an array of individual light sources and individual detectors. If an object, such as a hand, is inserted between an individual light source and its corresponding detector, a safety switch is tripped.
  • Such systems can be simplified using the techniques of the present invention. For example, referring to FIG.
  • FIG. 7A shows a top view of the same embodiment shown in FIG. 7 A.
  • the sensing section 16 can also be used with existing light safety curtain light sources that employ an array of individual light sources.
  • the present invention provides for a fiber optic light sensor that is durable, non-invasive, compact and inexpensive.
  • different embodiments of the present invention are adaptable to numerous and diverse applications. While the above description contains many specifics, the reader should not construe these as limitations on the scope of the invention, but merely as examples of specific embodiments thereof. Those skilled in the art will envision many other possible variations that are within its scope. Accordingly, the reader is requested to determine the scope of the invention by the appended claims and their legal equivalents, and not by the specific embodiments given above.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mechanical Engineering (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

L'invention concerne un système capteur de lumière à fibres optiques faisant intervenir un câble à fibres optiques présentant une âme et une gaine annulaire, ladite gaine annulaire recouvrant l'âme sur une section gainée (20) du câble afin d'empêcher le couplage de lumière parasite dans le câble. Une ou plusieurs sections de détection (16) situées sur la partie non gainée du câble sont destinées à recevoir de la lumière provenant de zones d'intérêt telles que des enceintes électriques (18). Un photodétecteur (26) est couplé à une extrémité du câble et détecte un signal lumineux pénétrant dans le câble au niveau des sections de détection (16). Des instruments de traitement de signal (24) connectés au photodétecteur (26) traitent ensuite le signal lumineux. Eventuellement, un élément de test intégré fait intervenir une source lumineuse (58) pour envoyer des signaux de test au travers du système.
PCT/US2001/019022 2000-09-01 2001-06-13 Systeme capteur de lumiere a fibres optiques Ceased WO2002021657A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001268387A AU2001268387A1 (en) 2000-09-01 2001-06-13 Fiber optic light sensor system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22995800P 2000-09-01 2000-09-01
US22995900P 2000-09-01 2000-09-01
US60/229,958 2000-09-01
US60/229,959 2000-09-01

Publications (1)

Publication Number Publication Date
WO2002021657A1 true WO2002021657A1 (fr) 2002-03-14

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PCT/US2001/019022 Ceased WO2002021657A1 (fr) 2000-09-01 2001-06-13 Systeme capteur de lumiere a fibres optiques

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WO (1) WO2002021657A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006071925A1 (fr) * 2004-12-28 2006-07-06 General Binding Corporation Dispositif de securite et de freinage dynamique a fibres optiques
DE102005005906A1 (de) * 2005-02-09 2006-08-17 Sick Ag Sensorsystem und Sicherungsverfahren
EP1710592A2 (fr) 2005-04-08 2006-10-11 Moeller GmbH Dispositif pour detecter un arc
US7579581B2 (en) * 2006-05-19 2009-08-25 Siemens Energy & Automation, Inc. System for optically detecting an electrical arc in a power supply
WO2010033842A1 (fr) 2008-09-19 2010-03-25 Schweitzer Engineering Laboratories, Inc. Protection contre les flashs d’arc par test automatique
US20100072352A1 (en) * 2008-09-19 2010-03-25 Kesler James R Electro-optical radiation collector for arc flash detection
US8451572B2 (en) 2008-09-19 2013-05-28 Schweitzer Engineering Laboratories Inc Protective device with metering and oscillography
EP2658060A1 (fr) * 2012-04-24 2013-10-30 LSIS Co., Ltd. Relais de protection numérique
US8593769B2 (en) 2008-09-19 2013-11-26 Schweitzer Engineering Laboratories Inc Secure arc flash detection
US8664961B2 (en) 2008-09-19 2014-03-04 Schweitzer Engineering Laboratories Inc Validation of arc flash detection systems
US9438028B2 (en) 2012-08-31 2016-09-06 Schweitzer Engineering Laboratories, Inc. Motor relay with integrated arc-flash detection
EP3306764A1 (fr) * 2016-10-06 2018-04-11 ABB Schweiz AG Disposition de capteur de détection de flash d'arc optique
US10804689B2 (en) 2016-11-18 2020-10-13 Schweitzer Engineering Laboratories, Inc. Methods and systems for evaluating arc flash exposure hazard
US11837862B2 (en) 2020-10-09 2023-12-05 Schweitzer Engineering Laboratories, Inc. Arc-flash sensor using optical fiber
WO2024121401A1 (fr) * 2022-12-08 2024-06-13 C.T.R. Manufacturing Industries Private Limited Transformateur, système de détection d'arc et procédé de détection d'arc
WO2025252970A1 (fr) 2024-06-07 2025-12-11 C.T.R. Manufacturing Industries Private Limited Système de détection d'arc et transformateur ayant un système de détection d'arc
TWI907886B (zh) 2022-12-08 2025-12-11 印度商Ｃ Ｔ Ｒ 製造工業私人有限公司 變換器、電弧檢測系統及用於檢測電弧之方法

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DE3534176A1 (de) * 1985-01-14 1986-07-17 Sprecher & Schuh AG, Aarau, Aargau Gekapselte, insbesondere metallgekapselte hochspannungs-anlage
CH676174A5 (en) * 1987-04-14 1990-12-14 Stroemberg Oy Ab Detection and quenching relay for switchgear arcs

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US4015122A (en) * 1974-07-12 1977-03-29 Rubinstein Walter M Photo-electric object detection system
DE3534176A1 (de) * 1985-01-14 1986-07-17 Sprecher & Schuh AG, Aarau, Aargau Gekapselte, insbesondere metallgekapselte hochspannungs-anlage
CH676174A5 (en) * 1987-04-14 1990-12-14 Stroemberg Oy Ab Detection and quenching relay for switchgear arcs

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006071925A1 (fr) * 2004-12-28 2006-07-06 General Binding Corporation Dispositif de securite et de freinage dynamique a fibres optiques
DE102005005906A1 (de) * 2005-02-09 2006-08-17 Sick Ag Sensorsystem und Sicherungsverfahren
DE102005005906B4 (de) * 2005-02-09 2008-02-21 Sick Ag Sensorsystem und Sicherungsverfahren
EP1710592A2 (fr) 2005-04-08 2006-10-11 Moeller GmbH Dispositif pour detecter un arc
EP1710592A3 (fr) * 2005-04-08 2008-12-03 Moeller GmbH Dispositif pour detecter un arc
US7579581B2 (en) * 2006-05-19 2009-08-25 Siemens Energy & Automation, Inc. System for optically detecting an electrical arc in a power supply
US8735798B2 (en) 2008-09-19 2014-05-27 Schweitzer Engineering Laboratories Inc Electro-optical radiation collector for arc flash detection
US9046391B2 (en) 2008-09-19 2015-06-02 Schweitzer Engineering Laboratories, Inc. Arc flash protection system with self-test
US8319173B2 (en) 2008-09-19 2012-11-27 Schweitzer Engineering Laboratories Inc Arc flash protection with self-test
US8451572B2 (en) 2008-09-19 2013-05-28 Schweitzer Engineering Laboratories Inc Protective device with metering and oscillography
EP2329577A4 (fr) * 2008-09-19 2013-07-31 Schweitzer Engineering Lab Inc Protection contre les flashs d arc par test automatique
US9653904B2 (en) 2008-09-19 2017-05-16 Schweitzer Engineering Laboratories, Inc. Arc flash protection system with self-test
US9515475B2 (en) 2008-09-19 2016-12-06 Schweitzer Engineering Laboratories, Inc. Electro-optical radiation collector for arc flash detection
US8593769B2 (en) 2008-09-19 2013-11-26 Schweitzer Engineering Laboratories Inc Secure arc flash detection
US8664961B2 (en) 2008-09-19 2014-03-04 Schweitzer Engineering Laboratories Inc Validation of arc flash detection systems
US8675329B2 (en) 2008-09-19 2014-03-18 Schweitzer Engineering Laboratories Inc Protective device with metering and oscillography
WO2010033842A1 (fr) 2008-09-19 2010-03-25 Schweitzer Engineering Laboratories, Inc. Protection contre les flashs d’arc par test automatique
EP2329576A4 (fr) * 2008-09-19 2014-07-09 Schweitzer Engineering Lab Inc Capteur de rayonnement électro-optique pour détection d'un flash d'arc électrique
US8803069B2 (en) 2008-09-19 2014-08-12 Schweitzer Engineering Laboratories, Inc. Electro-optical radiation collector for arc flash detection
US20100072352A1 (en) * 2008-09-19 2010-03-25 Kesler James R Electro-optical radiation collector for arc flash detection
EP2958209A1 (fr) * 2008-09-19 2015-12-23 Schweitzer Engineering Laboratories, Inc. Protection de flash d'arc avec auto-test
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