EP1935747B1 - Dispositif de détection de pont de court-circuit - Google Patents

Dispositif de détection de pont de court-circuit Download PDF

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Publication number
EP1935747B1
EP1935747B1 EP07024451.2A EP07024451A EP1935747B1 EP 1935747 B1 EP1935747 B1 EP 1935747B1 EP 07024451 A EP07024451 A EP 07024451A EP 1935747 B1 EP1935747 B1 EP 1935747B1
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EP
European Patent Office
Prior art keywords
short
circuit
detection device
rails
detection means
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.)
Active
Application number
EP07024451.2A
Other languages
German (de)
English (en)
Other versions
EP1935747A1 (fr
Inventor
Joannekes Fransiscus Carolus Adrianes De Beer
Lex Jozephus Maria Van Der Poel
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.)
Dual Inventive Holdings BV
Original Assignee
Dual Inventive Holdings BV
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 NL1033077A external-priority patent/NL1033077C2/nl
Application filed by Dual Inventive Holdings BV filed Critical Dual Inventive Holdings BV
Publication of EP1935747A1 publication Critical patent/EP1935747A1/fr
Application granted granted Critical
Publication of EP1935747B1 publication Critical patent/EP1935747B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
    • B61L23/06—Control, warning or like safety means along the route or between vehicles or trains for warning men working on the route
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/18—Railway track circuits
    • B61L1/181—Details
    • B61L1/187—Use of alternating current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
    • B61L27/50—Trackside diagnosis or maintenance, e.g. software upgrades
    • B61L27/53—Trackside diagnosis or maintenance, e.g. software upgrades for trackside elements or systems, e.g. trackside supervision of trackside control system conditions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
    • H01R13/6675—Structural association with built-in electrical component with built-in electronic circuit with built-in power supply
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
    • H01R13/6683—Structural association with built-in electrical component with built-in electronic circuit with built-in sensor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/22—Contacts for co-operating by abutting
    • H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
    • H01R13/2407—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means
    • H01R13/2421—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means using coil springs

Definitions

  • the invention relates to a device for detecting a short-circuit bridge between or across the rails of a railway section, suitable for simulating the presence of a train in said railway section, comprising a first arm, which can be brought into electrical contact with a first rail; a second arm, which can be brought into electrical contact with the other rail; an electrical power source, as well as detection means for detecting and monitoring, in use, the short-circuit resistance of the short-circuit bridge realised by the two arms and between the two rails.
  • the Dutch railway network is divided into several sections, also referred to as track sections.
  • the successive track sections are electrically isolated from each other.
  • track circuit determines by means of a so-called track circuit whether a train is present in the track section in question.
  • the track circuit forming part of the railway safety system consists of an AC voltage source connected to the rails on one side of the section and a track relay connected to rails on the other side of the section.
  • the track signal associated with the track section in question will change to red, indicating to oncoming trains that the railway track selection ahead of them is not clear.
  • the railway track safety system will automatically stop any trains that enter the track section yet.
  • This short-circuit bridge is realised by means of a so-called short-circuit lance as described in the introductory part of the main claim and as disclosed in, for example, Dutch patent publication No. 1000713 (corresponding with WO97/02169 ).
  • the known short-circuit lance comprises two arms which are each brought into electrical contact with one of the two rails.
  • the short-circuit realised by means of the short-circuit lance simulates the presence of a train, causing the track relay to drop out.
  • the railway safety system "thinks" that a train is present in the track section in question and thus bars trains from entering said section by changing all the signals of tracks leading towards said section to red.
  • This citation also discloses a specific design of the electrical power source and the detection means for detecting and monitoring the short-circuit bridge.
  • the short-circuit lance described in said publication comprises two arms, which can be brought into electrical contact with each of the rails, and which furthermore comprises a power source and as well as detection means, which, in use, detect and monitor the short-circuit resistance of the short-circuit bridge realised by the two arms and between the two rails.
  • the short-circuit lance according to NL-1000713 must make a good electrical contact with the two rails, which means that the two arms must be capable of penetrating through rust and dirt that may be present on the sides of the rails.
  • DE405128 a device is described for establishing a short-circuit bridge between or across the rails of a railway section and is directed to a specific design for improving the electrical contact with the rail.
  • the object of the invention is to provide a solution to the above problem, and according to the invention which is defined by the features of claim 1, whereby the device for detecting a short-circuit bridge between or across the rails of a railway section is characterised in that the detection means are provided with wireless communication means for wirelessly transmitting information regarding the status of the short-circuit resistance of the short-circuit bridge that has been realised. In this way it is no longer necessary to visit the track section in question to check the status of the short-circuit resistance.
  • the wireless communication means comprise a GSM and/or GPRS module.
  • the status of the detected short-circuit resistance can be transmitted to and/or retrieved from a central control unit or a responsible person.
  • the detection means are provided with positioning means for determining the geographic position of the detection device. Said geographic position can again be transmitted by means of the GSM and/or (GPRS) module via the wireless telecommunication link, so that also current information regarding the position identity of the detection device is obtained.
  • the positioning means comprise a GPS module in that case.
  • the detection means are arranged for determining the current state of the electrical power source. This makes it possible to indicate in time that the electrical power source needs to be exchanged or that the supply voltage being delivered by the electrical power source is too low, which is undesirable, because the protected track section is thus inadequately monitored, which may lead to dangerous situations.
  • the detection means may according to the invention comprise a remote-controlled switch, which switch is arranged for making or breaking the short-circuit bridge between the rails.
  • a remote-controlled switch which switch is arranged for making or breaking the short-circuit bridge between the rails.
  • the detection means comprise an impedance measuring circuit for detecting and monitoring the short-circuit resistance in use. More specifically, said impedance measuring circuit comprises an AC voltage source for applying an AC voltage signal to the rails via an ohmic resistance element. The impedance measuring circuit may furthermore be arranged for determining the current value of the short-circuit resistance on the basis of the ohmic resistance element, the applied AC voltage signal and the AC voltage signal measured across the ohmic resistance element.
  • the current value of the short-circuit resistance, and thus the status of the detection device can be determined in an efficient manner by carrying out two AC voltage signal measurements.
  • each arm member may furthermore be configured as a flexible member, in particular as a cable provided with a rail ground terminal. This makes it possible to install and connect the device in a track section in a simpler and more flexible manner.
  • Figure 1 shows a railway 1 built up of successive track sections 1 -1 -1 0 -1 +1 etc.
  • the track which comprises several track sections, is built up of rails 2a-2b, which are fixed to sleepers 3.
  • the successive track sections are separated from each other by means of insulating connecting bridges 4 provided in one of the rails 2a-2b or, as shown in the figure, in both rails.
  • Each track section 1 -1 -1 0 -1 +1 is provided with a track circuit, by means of which the presence of a train in the section in question can be detected.
  • the track circuit of each track section is built up of an AC voltage source 5, which is connected to each rail 2a, 2b by means of connections 5a, 5b, respectively.
  • a dropout or track relay 6 is provided, which is likewise electrically connected to the two rails 2a, 2b of the section in question by means of connections 6a, 6b, respectively.
  • Figure 1b shows the situation in which a train 7 enters the track section 1 0 from the left.
  • the axles 7a of the train create a short-circuit between the two rails 2a-2b, causing current to flow from the AC voltage source 5, via the connection 5a, the rail 2a, the axles 7a and via the other rail 2b and the connection 5b back to the AC voltage source.
  • the track relay 6 causing it to drop out.
  • This situation is shown in figure 1b .
  • Such short-circuiting of the track section 1 0 by a passing train 7 can also be simulated by a "simulation train", using a short-circuit lance, a prior art embodiment of which is shown in figure 2 .
  • the prior art short-circuit lance 10 is built up of a housing 10a, to which two arms 11-31 are connected, whose contact heads 17-37 can be brought into electrical contact with the respective rails 2a-2b.
  • the two arms 11-31 can be moved apart by means of a lever 10b so as to effect a good clamping engagement and thus a good electrical contact between the contact heads 17-37 and the two rails 2a-2b.
  • the short-circuit thus realised between the two rails 2a-2b can be detected or monitored by means of suitable detection means 15, in this embodiment in the form of a separate unit, which is connected to each contact head 17-37 by means of connections 15a and 15b, respectively.
  • the arms 11-31 Upon installation of the short-circuit lance 10 between the two rails 2a-2b, the arms 11-31 need to be moved apart by means of the lever 10b. Operating staff must to that end operate the lever 10b in a bent-over position in order to move the two arms 11-31 apart and into contact with the two rails 2a-2b. The user's bent-over position leads to a hazardous situation, since the person in question does not have a good view of the track section, which at that point is not protected and secured yet.
  • FIG. 3 shows an embodiment of the detection device according to the invention, and more in particular the detection means that detect and monitor the short-circuit resistance of the short-circuit bridge realised between the two rails 2a-2b by the two arms 11-31.
  • the core of the detection means 15 is formed by a central processing unit 50, also referred to as a "microcontroller”.
  • the microcontroller 50 controls the various parts of the detection means 15 so as to enable the detection device 10 to function correctly.
  • the detection means 15 are arranged for transmitting all kinds of collected status information to, for example, a central control unit or to a responsible person via a wireless communication link.
  • Said central control unit may be a computer or a server, for example, which can be accessed via a network (the Internet) by persons/bodies who can use the status information of the detection device 10 in question and are authorized to do so.
  • Said status information may inter alia comprise information regarding the position and identity of the detection device, but above all information regarding the status of the detection device, such as the current value of the measured short-circuit resistance.
  • wireless communication means 53 are provided, which are linked to a GSM module 56 (which may also be configured as a GRPS or UMTS module) and controlled by the microcontroller 50.
  • GSM module 56 which may also be configured as a GRPS or UMTS module
  • a wireless communication link can thus be set up via said GSM/GPRS/UMTS module for transferring the required status information to the remote central control unit.
  • positioning means 53' forming part of the wireless communication means 53 are provided, which positioning means are linked to a GPS module 56'. Combined with said GPS module 56', the positioning means make it possible to make a position determination for use by the detection device.
  • the geographic position thus determined can likewise be transmitted as part of the status information to be transmitted to the remote central control unit, using the wireless communication means 53. In this way the personnel present at the location of the central control unit can easily determine the location of the detection device 10 in question in a track section.
  • information regarding the identity of the detection device 10 in question can be transmitted together with the status information.
  • the detection means 15 are further provided with suitable means 54, referred to as management unit, for monitoring the supply voltage of the electrical power source 55.
  • suitable means 54 referred to as management unit
  • (rechargeable) batteries 55 are generally used. The limited life of such a battery 55 makes it necessary for the supply voltage to be monitored by a battery management unit 54.
  • the detection means will drop out and thus cease to monitor the status of the short-circuit resistance. Unintentional and undesirable dropping out of the short-circuit resistance (e.g.
  • the battery management 54 can thus forward specific information regarding the current power level of the battery 55 to the microcontroller 55, which in turn controls the wireless communication means 53 for transmitting the current power level of the battery 55, amongst other data.
  • the detection means 15 may comprise suitable control units 59 as additional "teachers" for controlling status indicators 62, in this case preferably in the form of LEDs.
  • Reference numeral 63 indicates a (key) switch for activating or deactivating the entire detection device.
  • Reference numeral 52 indicates a lighting element for illuminating the device 10 and its direct surroundings when work is being carried out at night.
  • the detection means 15 may furthermore be provided with a slot 60, into which a memory card 64 can be inserted. Thus, all kinds of relevant information can be stored on said memory card 64 for backup, maintenance and checking purposes.
  • reference number 61 indicates an external switch contact for connecting external auxiliary devices to the detection means 15.
  • the detection means 15 are also capable of receiving an externally transmitted message, for example an SMS message, for activating the detection device 10 or retrieving a status report with current information regarding the status of the detection means (current voltage level of the battery 55), the geographic position as determined by the positioning means 53'-56', and the current value of the short-circuit resistance between the two rails 2a-2b.
  • an externally transmitted message for example an SMS message
  • the microcontroller 50 can control the various parts of the detection means 15 and transmit the various status information thus obtained to the remote central control unit via the wireless communication means 53.
  • the central control unit (or “server”) can effect a direct communication link with the detection means 15 (for example via the VPN protocol).
  • the direct communication link can be used for continuously retrieving status information or transmitting control signals.
  • such an externally transmitted request received by the detection means 15 may contain various control signals, which control or instruct the microcontroller 50 to collect the status information of the various parts (battery 55, geographic positioning means 56', current short-circuit resistance as measured by the measuring circuit 51, the relay 57') and transmit it via the wireless communication means 53.
  • a control signal may also activate or de-activate the detection device 10.
  • the received control signal can be used by the microcontroller 50 for turning a relay switch 57' on or off by means of the switch unit 57, thereby making or breaking the short-circuit bridge between the rails 2a-2b.
  • the detection device 10 can be installed more or less semi-permanently in a track section and be activated by remote control in dependence on whether or not track work is being carried out in said section. This prevents personnel having to cover unnecessarily long distances for manually making and breaking the short-circuit bridge of the detection device 10 between the rails 2a-2b. Said making or breaking of the short-circuit bridge between the two rails 2a-2b by means of the (relay) switch 57' is detected by the switch unit 57 and fed back as status information to the microcontroller 50, which can transmit said status information to the central control unit via the wireless communication means 53.
  • Reference numeral 65 indicates an external switch contact on the detection device 10, to which an external power source can be connected for energizing the relay 57' for a prolonged period of time.
  • the detection means 15 are provided with an impedance measuring circuit 51 for detecting or monitoring the short-circuit resistance of the short-circuit bridge realised between the rails 2a-2b by the two arms 11-31.
  • Said impedance measuring circuit 51 is shown in more detail in figure 4 .
  • the impedance measuring circuit 51 is built up round a galvanically isolated milliohm measuring unit 510. Said milliohm measuring unit 510 must be galvanically isolated so as to be more adequately shielded from any and all interference voltage in the rails 2a-2b.
  • a sinusoidal AC voltage source 511 which optionally applies an AC voltage signal V ref to the rails 2a-2b via a transformer and an ohmic resistance element 512.
  • the rails 2a-2b themselves have an internal impedance Z, which impedance is schematically indicated at 513 in figure 4 .
  • the impedance Z of the rails 2a-2b and the ohmic resistance element 512 are connected in series.
  • the ohmic resistance value of the resistance element 512 is precisely known.
  • the voltage signals V m is measured directly downstream of the ohmic resistance element 512.
  • the short-circuit resistance Z between the rails 2a-2b can be measured.
  • the power supply signals V ref being applied and the measured voltage signal V m derived therefrom are sensitive to all kinds of interference signals, whose amplitude and power may be larger than those of the actual measuring signal being generated.
  • interference can be eliminated in large measure by building up the detection means 15, and more in particular the impedance measuring circuit 51, of digital components, in which case the various measuring signals are digitally generated and processed.
  • analog components are needed for the further processing of the measuring results, for example for supplying the information in question to, for example, the wireless communication means 53 by analog means. Said analog components can no longer interfere with the final measuring result, however.
  • each arm member may furthermore be configured as a flexible member, in particular as a cable provided with a rail ground terminal. This enables a simpler and more flexible installation and connection of the device in a track section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Claims (11)

  1. Dispositif (10) pour détecter un pont de court-circuit entre ou sur les rails (2a, 2b) d'une section de voie ferrée, approprié pour simuler la présence d'un train dans ladite section de voie ferrée, le dispositif comprenant
    un premier bras (11) qui peut être amené en contact électrique avec un premier rail (2a) ;
    un second bras (31) qui peut être amené en contact électrique avec l'autre rail (2b) ;
    une source de courant électrique (55), ainsi que
    des moyens de détection (15) pour détecter et surveiller, à l'usage, la résistance au court-circuit du pont de court-circuit réalisé par les deux bras et entre les deux rails, caractérisé en ce que les moyens de détection sont dotés de moyens de communication sans fil (53) pour transmettre, sans fil, des informations concernant (l'état de) la résistance au court-circuit du pont de court-circuit qui a été réalisé.
  2. Dispositif de détection selon la revendication 1, caractérisé en ce que les moyens de détection peuvent recevoir des signaux de commande transmis extérieurement pour contrôler ou donner des instructions au dispositif.
  3. Dispositif de détection selon la revendication 1 ou 2, caractérisé en ce que les moyens de communication sans fil comprennent un module GSM et/ou GPRS.
  4. Dispositif de détection selon la revendication 1, 2 ou 3, caractérisé en ce que les moyens de détection sont dotés de moyens de positionnement (53') pour déterminer la position géographique du dispositif de détection (10).
  5. Dispositif de détection selon la revendication 4, caractérisé en ce que les moyens de positionnement (53') comprennent un module GPS.
  6. Dispositif de détection selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que les moyens de détection (15) sont agencés pour déterminer la condition actuelle de la source de courant électrique (55).
  7. Dispositif de détection selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que les moyens de détection (15) comprennent un commutateur commandé à distance (57-57'), lequel commutateur est agencé pour établir ou rompre le pont de court-circuit entre les rails.
  8. Dispositif de détection selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que les moyens de détection comprennent un circuit de mesure d'impédance (51) pour détecter et surveiller la résistance au court-circuit, à l'usage.
  9. Dispositif de détection selon la revendication 8, caractérisé en ce que ledit circuit de mesure d'impédance (51) comprend une source de tension AC (511) pour appliquer un signal de tension AC sur les rails via un élément de résistance ohmique (512).
  10. Dispositif de détection selon la revendication 9, caractérisé en ce que ledit circuit de mesure d'impédance (51) est agencé pour déterminer la valeur actuelle de la résistance au court-circuit en fonction de l'élément de résistance ohmique (512), le signal de tension AC appliqué et le signal de tension AC mesuré sur l'élément de résistance ohmique.
  11. Dispositif de détection selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que chaque élément de bras est configuré comme un élément flexible, en particulier comme un câble prévu avec une borne de terre de rail.
EP07024451.2A 2006-12-18 2007-12-17 Dispositif de détection de pont de court-circuit Active EP1935747B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1033077A NL1033077C2 (nl) 2006-12-18 2006-12-18 Detectie-inrichting van een kortsluitingsbrug.
NL1033581A NL1033581C2 (nl) 2006-12-18 2007-03-23 Detectie-inrichting van een kortsluitingsbrug.

Publications (2)

Publication Number Publication Date
EP1935747A1 EP1935747A1 (fr) 2008-06-25
EP1935747B1 true EP1935747B1 (fr) 2014-11-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07024451.2A Active EP1935747B1 (fr) 2006-12-18 2007-12-17 Dispositif de détection de pont de court-circuit

Country Status (1)

Country Link
EP (1) EP1935747B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1036399C2 (nl) * 2009-01-09 2010-07-13 Dual Inventive B V Detectie-inrichting van een kortsluitingsbrug.
JP2016199059A (ja) * 2015-04-07 2016-12-01 鹿島建設株式会社 軌道短絡器具
EP3351454B1 (fr) * 2017-01-13 2020-11-25 Dual Inventive Holding B.V. Dispositif de desactivitation a distance d'une catenaire
NL2021010B1 (nl) * 2018-05-29 2019-12-04 Dual Inventive Holding B V spoorweg detonator

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE405128C (de) 1923-05-12 1924-10-30 Siemens Schuckertwerke G M B H Kurzschlussvorrichtung fuer Stromschienen elektrischer Bahnen
US2275367A (en) * 1940-12-05 1942-03-03 James Robert Sloan Electric rail connector
NL1000713C2 (nl) 1995-06-30 1996-12-31 Railbedrijven B V Zelfdetecterende kortsluitbrug voor een beveiligde spoorbaansectie.
NL1001121C2 (nl) 1995-09-01 1997-03-04 Railbedrijven B V Contactkop voor het maken van meervoudig elektrisch contact met een geleidend voorwerp en middelen voorzien van een dergelijke contactkop.
US6102340A (en) * 1997-02-07 2000-08-15 Ge-Harris Railway Electronics, Llc Broken rail detection system and method
GB2391718A (en) * 2002-08-06 2004-02-11 Hewlett Packard Co Flexible electrical connector having housing,plurality of signal carriers and an elongate return conductor
US6845953B2 (en) * 2002-10-10 2005-01-25 Quantum Engineering, Inc. Method and system for checking track integrity
US7411405B2 (en) * 2004-11-03 2008-08-12 Panduit Corp. Method and apparatus for reliable network cable connectivity
US20080105791A1 (en) * 2004-12-13 2008-05-08 Karg Kenneth A Broken Rail Detection System

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Publication number Publication date
EP1935747A1 (fr) 2008-06-25

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