The document discusses different types of Automatic Track Circuit (AFTC) technologies including ABB (TI-21), Siemens (FTGS), and Alstom. It provides technical specifications, components, block diagrams, and advantages of these AFTC systems. The key information covered includes operating frequencies and modulation methods, maximum effective track circuit lengths, indoor and outdoor equipment used, and track connections/separation joints.

1. Types of A.F.T.C. TI-21 (ABB)‏ FTGS ( SIEMENS )‏ ALSTOM (DC-CODED)‏ UM-7 SEF- FRANCE 1699 Hz 2296 Hz 1996 Hz 2593 Hz 1549 Hz 2146 Hz 1848 Hz 2445 Hz 8-TYPES FTGS-46 4.75 KHz 5.25 KHz 5.75KHz 6.25 KHz FTGS-917 9.5KHz 10.5 KHz 11.5 KHz 12.5 KHz 13.5 KHz 14.5 KHz 15.5KHz 16.5 KHz 6-TYPES 2100 Hz 2500 Hz 2900 Hz 3300 Hz 3700 Hz 4100 Hz 4-TYPES 1700 Hz 2300 Hz 2000 Hz 2600 Hz Next Stop 12-TYPES

2. ADVANTAGES OF AFTC Joint less Track Circuits except in point zone. Immune to AC/DC Traction interference. Suitable for Non-RE Section. More Length. Less Depends on R B Integrity (presence) of both rails are ensured in the circuit. Both Rails are available for Traction Return Current. Less maintenance ,less staff more reliable. Sensitive TR with high % of release are not required . Next HOME Back

3. ABB (T1 TYPE) A.F.T.C. Next HOME Back

4. TI-21 A.F.T.C. TI-21 Can be arranged End Feed arrangement(Continuous )‏ Center Feed Arrangement (Continuous) ‏ A.F.T.C. Ending with other type Track Circuit. A.F.T.C. Ending with Non-Track Circuited Zone. Next HOME Back

5. TECHNICAL SPECIFICATION OF TI-21 + / - 5 mm MAX about centre of tunned area. 6. TRACK CIRCUIT EXTRIMITY 20 Mt. +/- 0. 5 Mt. 10. SEPARATION JOINT (TUNED AREA)LENGTH 1 Milli ohm maximum per connection. 9. TRACK CONNECTION RESSISTANCE Standard Nutral Relay 50 V DC. 8. RELAY 0.8 -- 1. 8 V 4.5 -- 7.5 V 7. TRACK FEED 1. LOW POWER MODE VOLTAGES 2. HIGH POWER MODE 1500 KHz TO 2600 KHz. Approx. 11. FREQUENCY RANGE -30 O TO + 70 O 5. TEMPARATURE RANGE 0.15  MAXIMUM 0.5  MAXIMUM 4. TARIN SHUNT 1. INSIDE TUNNED AREA 2. OUTSIDE TUNNED AREA 0.5 mho/km max. 3.BALLAST CONDUCTANCE 50 TO 250 M 200 TO 1100M (960 M)‏ 600 TO 2000 M (1800M)‏ 2.LENGTH 1. LOW POWER MODE 2. HEIGH POWER MODE .(END FEED)‏ 3. HEIGH POWER MODE (CENTER FEED)‏ 11OV,50 KHz OR 24 V DC 1.POWER SUPPLY Next HOME Back

6. COPONENTS FOR END FEED A.F.T.C. POWER SUPPLY UNIT (PSU) 2 Nos. TRANSMITTER UNITS (Tx ) 1 Nos. RECEIVER UNITS ( Rx ) 1 Nos. TUNING UNITS (T U-Tx & TU- Rx ) 2 Nos. LINE RELAY (QN1) (50 V,1350  ) 1 Nos. CABLES 1) Tx ,Rx TO T.U. 2 Set. 2) T.U. TO TRACK 2 Set. Next HOME Back

7. BLOCK DIGRAM OF TI-21 END FEED AFTC TU- B TU- A Rx- B PSU Tx- A TU- A TU- B Rx- A PSU Tx- B Tx - END Tx - END Rx - END Rx - END 24 V DC 24 V DC 110 V AC/50 KHz +/- 7% I/P Tapping ( 5-0-95-105-110)‏ O/P Volt. – 22.5 v to 30.5 V DC O/P Current – 4.4A(max)‏ Ripple Volt-3 V PIP 50/.25 Sq.mm Cu Cable 350 Mt. Max. 10V to 11V AC (A,C,E,G)‏ 15 V to 16 V AC (B,D,F,H)‏ Voltage On Rail V -TX V –R X 0.8V-1.8V 4.5V – 7.5 V MODE Low Power Normal 0.5 – 0. 8 V 0.4 – 1.6 V 24 V DC 24 V DC 35 Sq mm Cu/its Eq. 50/.25 Sq.mm Cu Cable 30 Mt. Max. Next HOME Back

8. BLOCK DIGRAM OF TI-21 CENTER FEED AFTC TU- B Rx- B PSU TU- A TU- B Rx- A PSU Tx- B Tx - END Rx - END Rx - END 24 V DC 24 V DC 110 V AC ETU Tx- A Tx - END TU- A Rx- A PSU TRA TRA Rx - END Next HOME Back

9. AFTC END FEED WITH NO TRACK CIRCUIT ZONE TU TU 20 +/- 0.5 Mt. < 1 Mt. AFTC END FEED OTHER TYPE OF TRACK CIRCUIT ZONE OTHER T/CKT. Next HOME Back

10. Transmitter ABB MULTI- VIBRETOR MODU- LATOR O/P FILTER OSCILATOR 1 2 3 4 5 6 OUT-PUT AMPLIFIER MATCHING TRANSFORMER TO TU F+17 F+17 F+17 F-17 F-17 Modulation at 4.8 KHz O/P AMP Next HOME Back

11. RECEIVER- ABB 4a FILTER FILTER FILTER FILTER AMPLIFIER AMPLIFIER DEMODULATOR DEMODULATOR TIME DELAY RELAY DRIVE SEQUENTIAL AND GATE INPUT TRANSFORMER INPUT FROM TU OUT PUT RELAY 1 2a 3a 5a 6 4b 2b 3b 5b 7 Next HOME Back

12. Gain Setting In T1 Type AFTC 1H 1L 3H 3L 9H 9L FROM ETU / TTU 1  9 3 1 IP1 IP2 GAIN IP1 IP2 Loop-1 Loop-2 5 3L 9L 1H-9H 1L-3H 7 3L 9L 1H-3H 1L-9H 9 9L 9H 12 3H 9L 3L-3H 13 1H 9L 1L-3H 3L-3H Gain Calculation Step 1 :-IP2 to 9 L through 1  Register Step 2:-9 L to 9H = +9 Gain 9H to 1L Loop = 0 Gain Step3 : - 1L to 1 H = +1Gain 1 H to 3 H Loop = 0 Gain Step 4:-3H to 3L = -3 Gain Step 5 :-3L to IP1 = 0 Gain Total Gain = (+9 )+ (+1)+(-3) = 7 Next HOME Back

13. Seimen’s A.F.T.C. 6 System Characteristics and Technical Data Range of applications Station and open- line tracks, points and crossings Joints Electrical separation joints with S. terminal and shunt bonds Traction current return Two-rail Interference Frequency-modulated transmission provides immunity to interference Cable faults Protection by coded transmission and intercore short-circuit supervision Component failures Safety measures dual-channel design of receive equipment parallel movement (synchronism) of trac circuit relays: error detection by divergent condition of the two relays Shock-hazard voltages Electrical isolation between outdoor and indoor equipment Rated operating frequencies FTG S 46: 4.75 kHz, 5.25 kHz, 5.75 kHz, 6.25 kHz FTG S 917: 9.5 kHz, 10.5 kHz, 11.5 kHz, 12.5 kHz, 13.5 kHz, 14.5 kHz, 15.5 kHz, 16.5 kHz Modulation Frequency modulation (shift keying) Bit pattern for coding 15 different bit patterns Transmission speed For the transmission of time-multiplex bit patterns: VD = max. 200 bit/s Operating reliability MTBF: 5 years Pick-up delay of track circuitt : approx. 0.6 s (in special cases 1.3 s) relays Drop-out delay of track circuit tdr: approx. 0.25 s (in special cases 0.17 s) relays Power supply Operating voltage: U = 230 V AC +10 %/—15 %, 50Hz + 2% System Description VT 1 P 64 Siemens code no: 43 FTG S Track Circuit A25000-X22-Q41-O1-7629 of without Data Transmission (EZS) 15-12-97 Notice no: K75/D62/V 44 Copyright © Siemens AG 1997 All Ri ghts Reserved BFTGSENG.DOC

14. Technical data-1 Next HOME Back

15. Technical data-2 Next HOME Back

16. FTGS STD CONFG. Next HOME Back

17. BLOCK DIGRAM SEIMEN’S AFTC FILTER AMPLIFIER TRANSMITTER RECEIVER Rx 1.2 RECEIVER Rx 1.1 RESPONCE LEVEL SETTING FILTER RECEIVER Rx 2.2 RECEIVER Rx 2.1 DE- MODULATOR DE- MODULATOR RELAY-2 RELAY-1 POWER SUPPLY +12 V;+5V DC T.U. T.U. CABLES Next HOME Back

18. Seimen’s A.F.T.C Maximum Effective Length Of Track Circuit. Range Of Influence For R B = 1.5 OHM X K.M. R B = 1.5 OHM X K.M. FTGS 917 REMOTE FEEDING Z A ST 917 M 917 ST 917 M 917 4.5 KM <= 1.0 OHM 300 M 750 M 350 M 950 M 4.5 KM <= 0.5 OHM 350 M 850 M 400 M 1000 M 6.5 KM <= 0.5 OHM 300 M 700 M 330 M 850 M REMOTE FEEDING Z A ST 917 M 917 W/K 917 ST 917 M 917 6.5 KM <= 0.5 OHM 600 M 1200 M 750 M 1500 M FTG S 46 ZA = PERMEETED AXLE SHUNT ST=STANDARD LAYOUT RB = SPECIFIC BALLAST RESISTANCE M = CENTER – FED –LAYOUT W/K = POINTS & CROSSING LAYOUT. Next HOME Back

19. TRACK VACANCY DETECTION Next Next HOME Back

20. Modulation And Coding Next HOME Back

21. AFTC EQUIPMENT INDOOR EQUIPMENT CPU FRAMES TRANCMITTER CARD AMPLIFIER / FILTER CARD RECEIVER – I CARD RECEIVER – II CARD DEMODULATION CARD RELAY CARD OUT DOOR EQUIPMENT TUNNING UNIT :- Feed In ( Tx ) Feed Out (Rx) TRACK CONNECTIONS . OUTDOOR CABLE :- (Star Quad Cable 9mm Dia)‏ TRACK TO T.U. CONNECTIONS . (25 Sq Mm Cu Lead Rope) ‏ Next HOME Back

22. SEPARATION JOINTS Next HOME Back

23. TRACK CONNECTIONS 9M 9M 3.2M 3.2M FTGS 46 6.7 M 1.75 M FTGS 917 FTGS 917 FTGS 46 S-BOND OF STEEL WIRE ROPE 16 mm DIA IN BET. TWO AFTC’S ALFA-BONDS OF GALVANISED STEEL WIRE ROPE 16 mm DIA AT THE END OF THE AFTC’S Next HOME Back

24. S-BOND ARRENGEMENT Next HOME Back

25. Track side Connection box Next HOME Back

26. Tx T.U. Next HOME Back

27. Rx T.U. Next HOME Back

28. Modulation Frame FTGS917 Next HOME Back

29. Modulation Frame FOR POINT T.C. Next HOME Back

30. Modulation Frame FOR X- ING T.C. Next HOME Back

31. Modulation Frame FTG S 46 T.C. Next HOME Back

32. Modulation Frame FTG S 46 - M T.C. Next HOME Back

33. Transmitter Board Next HOME Back

34. Filter & Amplifier Board Next HOME Back

35. Receiver - I Board Next HOME Back

36. Demodulator Board Next HOME Back

37. Receiver – II Board Next HOME Back

38. A.F.T.C. From :- PARDESHI SACHIN S. S.E./Sig/KYN SSE/Sig(M)/KYN Mumbai Div. C.R. India HOME Back