EP0624507B1 - Impedanzverbindungen - Google Patents

Impedanzverbindungen Download PDF

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Publication number
EP0624507B1
EP0624507B1 EP94301669A EP94301669A EP0624507B1 EP 0624507 B1 EP0624507 B1 EP 0624507B1 EP 94301669 A EP94301669 A EP 94301669A EP 94301669 A EP94301669 A EP 94301669A EP 0624507 B1 EP0624507 B1 EP 0624507B1
Authority
EP
European Patent Office
Prior art keywords
current
bond unit
impedance bond
flow
rails
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
EP94301669A
Other languages
English (en)
French (fr)
Other versions
EP0624507A1 (de
Inventor
Malcolm Reeves
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.)
Siemens Mobility Ltd
Original Assignee
Westinghouse Brake and Signal Co Ltd
Westinghouse Brake and Signal Holdings Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Brake and Signal Co Ltd, Westinghouse Brake and Signal Holdings Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Publication of EP0624507A1 publication Critical patent/EP0624507A1/de
Application granted granted Critical
Publication of EP0624507B1 publication Critical patent/EP0624507B1/de
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
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/18—Railway track circuits
    • 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
    • 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

Definitions

  • This invention relates to impedance bonds for railways.
  • the vehicles' traction power (which may be supplied to the vehicles by, for example, a catenary wire over the railway tracks) may be returned to the substation via the rails of the track.
  • the highest efficiency is obtained when both rails are used.
  • This may be done using a shorting bar to connect the rails directly together, but where track circuit signalling is used, shorting bars cannot be employed because they would short-circuit the track circuit system.
  • the rails are connected by impedance bond connectors which present a low impedance at the frequency of operation of the traction circuit but a high impedance at the frequency at which the track circuit signalling system operates.
  • impedance bonds include an LC circuit connected to the rails 1,2 via a transformer and resonated so as to have a high impedance at the frequency of the track circuit signals.
  • the traction current is returned to the substation via a centre tap of the transformer. Where the bond acts only to balance the traction currents in the rails the centre tap is left unused.
  • impedance bonds must maintain their impedance characteristics over a range of temperatures (to cope with varying weather conditions). It is difficult to design conventional impedance bonds to achieve this effect; and in overcoming the problem conventional impedance bonds are generally made to be bulky.
  • an impedance bond unit for use in returning traction circuit current from first and second rails of a railway track, comprising:
  • the sensing means preferably senses flow of current at the first or second input.
  • the control signal preferably is produced in dependence on the sensed flow of current in the region of a determined frequency, suitably a track circuit frequency.
  • the active control means includes power amplification means (which could be linear but most preferably includes switch mode power amplification means) preferably controlled by the feedback means so as cause power to be applied selectively between the rails to reduce said flow of signalling current.
  • power amplification means which could be linear but most preferably includes switch mode power amplification means
  • the active control means includes a transformer having a first winding coupled between the first input and the second input, with a centre tap coupled with the traction output; and a second winding coupled so as to receive power from the power supply means.
  • the sensing means preferably senses flow of current between the first winding of the transformer and one rail of the track.
  • FIG. 2 shows two side-by-side rails 1,2 between which one winding 3 of a transformer is connected via inputs 1' and 2'.
  • the other winding 4 of the transformer is connected across an active power supply/amplification circuit 5.
  • the active power supply/amplification circuit 5 supplies power selectively across the winding 4 so as to give the effect of reducing the flow of signalling current between the rails whilst allowing flow of traction current from the rails to a traction return output 3' connected to a centre tap of the winding 3.
  • FIG. 3 shows the impedance bond unit in greater detail.
  • the rails 1,2 are coupled together via inputs 1' and 2' across one winding 3 of a transformer, a centre tap 6 of which receives traction current to be returned via output 3' from vehicles on the track, for example to a substation.
  • the other winding 4 of the transformer is connected across the active power supply circuit 5. This comprises a power supply unit 7 and a switch mode amplifier 8.
  • the power supply unit comprises a standard rectifying power supply circuit connected between the rails via inputs 1'' and 2'', and a switch mode power supply unit 9, and uses the signalling current in the rails for its power.
  • the unit could use a separate source if available.
  • the switch mode amplifier 8 comprises a current sensor 10, a control feedback unit 11 and a control circuit 12.
  • the current sensor 10 detects the flow of current between the impedance bond unit and the rail 2.
  • a representation of the detected current is transmitted to the control feedback unit 11 which, using negative feedback, produces a feedback signal in dependence on the detected flow of current at (or in the region of) a determined frequency (the frequency of the track circuit signals in the railway system).
  • the feedback signal is received by control circuit 12 which selectively controls the supply of power from the power supply unit 7 to the winding 4 of the transformer, in response to the feedback signal, so as to ensure that the flow of current through the impedance bond unit at (or in the region of) the determined frequency of the track circuit signals is minimized. This involves current flow to and from the power supply unit. Thus the power supply unit only needs to supply power to cover any power losses.
  • the circuit may include resonant capacitor 13 connected across winding 4.
  • the impedance bond unit may be used to assist in the management of the railway system by measuring and recording (or transmitting to a control station) data on the flow of current in the system.
  • data could include details of the level of the traction return current, the difference in current between the rails and the harmonic content of the return current could be measured.
  • current sensor 10 has an output 14 for transmitting to a recordal/transmission unit data concerning the detected flow of current.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Claims (13)

  1. Gleichstromschienenverbinder mit Wechselstromsperre zur Rückführung von Netzstrom von der ersten und zweiten Schiene (1, 2) eines Eisenbahngleises, mit:
    einem ersten Eingangsanschluß (1') zum Anschließen der ersten Schiene (1);
    einem zweiten Eingangsanschluß (2') zum Anschließen der zweiten Schiene (2);
    einem Fahrstromausgangsanschluß (3') zur Rückführung von Fahrstrom und
    Steuerungsmitteln (5), die mit dem ersten und zweiten Eingangsanschluß sowie mit dem Fahrstromausgangsanschluß (3') verbunden sind, um das Fließen des Fahrstroms vom ersten und zweiten Eingangsanschluß (1', 2') zum Fahrstromausgangsanschluß (3') zu ermöglichen und um den Signalstromfluß zwischen dem ersten und dem zweiten Eingangsanschluß (1', 2') zu verringern, dadurch gekennzeichnet, daß die Steuerungsmittel (5) über aktive Steuerungsmittel verfügen, welche folgendes aufweisen:
    ein Abtastmittel (10) zum Abtasten des Signalstromflusses zwischen den Schienen über den Gleichstromschienenverbinder mit Wechselstromsperre und zum Erzeugen eines Steuerungssignals in Abhängigkeit des abgetasteten Signalstromflusses und,
    Rückkopplungsmittel (11, 12) zum Steuern der Aktion der aktiven Steuerungsmittel in Beantwortung des Steuersignals zur Verringerung des Signalstromflusses zwischen dem ersten und dem zweiten Eingangsanschluß.
  2. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 1, wobei das Abtastmittel (10) den Stromfluß an einem dieser Eingangsanschlüsse (1', 2') abtastet.
  3. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 2, wobei das Abtastmittel (10) einen Ausgangsanschluß (14) aufweist, zum Übertragen von Daten bezüglich des abgetasteten Stromflusses zu Aufzeichnungs- oder Übertragungsmitteln.
  4. Gleichstromschienenverbinder mit Wechselstromsperre gemäß einem der vorhergehenden Ansprüche, wobei das Steuersignal in Abhängigkeit des abgetasteten Stromflusses im Bereich einer festgelegten Frequenz erzeugt wird.
  5. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 4, wobei es sich bei der festgelegten Frequenz um eine Gleisstromkreisfrequenz handelt.
  6. Gleichstromschienenverbinder mit Wechselstromsperre gemäß einem der vohergehenden Ansprüche, wobei das aktive Steuerungsmittel (5) Mittel zur Leistungsverstärkung (8) umfaßt.
  7. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 6, wobei das Mittel zur Leistungsverstärkung (8) ein Mittel zur Verstärkung des Schaltmodus ist.
  8. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 6 oder 7, wobei das Mittel zur Leistungsverstärkung (8) durch die Rückkopplungsmittel (11, 12) derart gesteuert wird, daß die Leistung selektiv zwischen den Schienen (1, 2) angelegt wird, um den Signalflußstrom zu verringern.
  9. Gleichstromschienenverbinder mit Wechselstromsperre gemäß einem der vorhergehenden Ansprüche, wobei das aktive Steuerungsmittel (5) auch ein Stromversorgungsmittel (7) umfaßt.
  10. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 9, wobei das Stromversorgungsmittel (7) ein Schaltmodus-Stromversorgungsmittel (9) umfaßt.
  11. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 9 oder 10, wobei das Stromversorgungsmittel (7) dritte und vierte Eingangsanschlüsse (1'', 2'') zum Anschließen an die erste bzw. an die zweite Schiene (1, 2) aufweist, um dem Stromver- sorgungsmittel (7) das Ziehen von Leistung aus den Gleisstromkreis- signalen in den Schienen zu ermöglichen.
  12. Gleichstromschienenverbinder mit Wechselstromsperre gemäß einem der Ansprüche 9 bis 11, wobei das aktive Steuerungsmittel (5) einen Trafo umfaßt, mit einer ersten Wicklung (3), die zwischen dem ersten Eingangsanschluß (1') und dem zweiten Eingangsanschluß (2') mittels eines mittigen Abgriffes (6) angeschlossen ist, der selbst mit dem Fahrstromausgang (3') gekoppelt ist, und eine zweite Wicklung (4), die derart gekoppelt ist, daß sie aus dem Stromversorgungsmittel (7) mit Strom versorgt wird.
  13. Gleichstromschienenverbinder mit Wechselstromsperre gemäß Anspruch 12, wobei das Abtastmittel (10) den Stromfluß zwischen der ersten Wicklung (3) des Trafos und einer der Schienen (1, 2) des Gleises abtastet.
EP94301669A 1993-05-14 1994-03-09 Impedanzverbindungen Expired - Lifetime EP0624507B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9309993A GB2278005B (en) 1993-05-14 1993-05-14 Impedance bonds
GB9309993 1993-05-14

Publications (2)

Publication Number Publication Date
EP0624507A1 EP0624507A1 (de) 1994-11-17
EP0624507B1 true EP0624507B1 (de) 1997-10-22

Family

ID=10735509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94301669A Expired - Lifetime EP0624507B1 (de) 1993-05-14 1994-03-09 Impedanzverbindungen

Country Status (4)

Country Link
EP (1) EP0624507B1 (de)
DE (1) DE69406354T2 (de)
ES (1) ES2107746T3 (de)
GB (1) GB2278005B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278219B (en) * 1993-05-20 1997-01-22 Westinghouse Brake & Signal Railway track circuits

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2240673A5 (en) * 1973-08-10 1975-03-07 Jeumont Schneider Railway system AC pulsed track circuits - eliminates stray interference effects from return traction current
IT1151495B (it) * 1980-04-18 1986-12-17 Ansaldo Sa Rilevatore di squilibrio della corrente armonica di trazione nei circuiti di binario
IT1157785B (it) * 1982-11-23 1987-02-18 Sasib Spa Dispositivo rivelatore dello squilibrio fra le due frazioni della corrente di ritorno della trazione sulle due rotaie di un binario ferroviario

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Electronic Circuits, Design and Applications, U.Tietze and Ch. Schenk, Springer-Verlag, Berlin 1991, pages 350-351, 372-373 and 384-385. *

Also Published As

Publication number Publication date
GB9309993D0 (en) 1993-06-30
ES2107746T3 (es) 1997-12-01
GB2278005A (en) 1994-11-16
EP0624507A1 (de) 1994-11-17
GB2278005B (en) 1997-01-15
DE69406354D1 (de) 1997-11-27
DE69406354T2 (de) 1998-05-20

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