GB929050A - Railway track circuits - Google Patents

Railway track circuits

Info

Publication number
GB929050A
GB929050A GB36706/60A GB3670660A GB929050A GB 929050 A GB929050 A GB 929050A GB 36706/60 A GB36706/60 A GB 36706/60A GB 3670660 A GB3670660 A GB 3670660A GB 929050 A GB929050 A GB 929050A
Authority
GB
United Kingdom
Prior art keywords
track
value
resistance
transformer
oct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB36706/60A
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.)
Westinghouse Air Brake Co
Original Assignee
Westinghouse Air Brake Co
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 Air Brake Co filed Critical Westinghouse Air Brake Co
Publication of GB929050A publication Critical patent/GB929050A/en
Expired legal-status Critical Current

Links

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
    • B61L1/181—Details
    • B61L1/187—Use of alternating current

Landscapes

  • 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)
  • Braking Systems And Boosters (AREA)

Abstract

929,050. A.C. track circuits. WESTING- HOUSE AIR BRAKE CO. Oct. 26, 1960 [Oct. 28, 1959], No. 36706/60. Class 105. An A.C. track circuit comprises track relay 41 energized from track rails 11a, 11b, via transformer 31 and rectifier 35, and a feed circuit comprising an A.C. source, a saturable transformer 15 and a condenser 21 connected in series with the transformer primary 17. The feed circuit is designed so that the track voltage increases with track resistance up to a critical value of resistance at which the transformer saturates and its primary circuit exhibits a non- linear resonance condition during which the track voltage increases rapidly to a new value and remains substantially constant at this value during further increase in track resistance. A value of critical resistance is chosen equal to the lowest value of track resistance expected and the track relay is designed to operate at the constant value of track voltage.
GB36706/60A 1959-10-28 1960-10-26 Railway track circuits Expired GB929050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US849202A US3011050A (en) 1959-10-28 1959-10-28 Sensitive shunting circuits

Publications (1)

Publication Number Publication Date
GB929050A true GB929050A (en) 1963-06-19

Family

ID=25305298

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36706/60A Expired GB929050A (en) 1959-10-28 1960-10-26 Railway track circuits

Country Status (2)

Country Link
US (1) US3011050A (en)
GB (1) GB929050A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450874A (en) * 1967-03-31 1969-06-17 Gen Electric Railway track circuit
US3958782A (en) * 1975-02-06 1976-05-25 General Signal Corporation Shunt enhancement logic circuit
US7296770B2 (en) * 2005-05-24 2007-11-20 Union Switch & Signal, Inc. Electronic vital relay

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2061747A (en) * 1934-08-08 1936-11-24 Union Switch & Signal Co Railway track circuit apparatus
US2421148A (en) * 1942-06-12 1947-05-27 Automatic Elect Lab Electromagnetic relay circuit
GB734573A (en) * 1951-03-28 1955-08-03 Siemens & Gen Electr Railway Improvements in and relating to railway track circuiting systems

Also Published As

Publication number Publication date
US3011050A (en) 1961-11-28

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