ertms solutions tvmlifecheck - april 2016

TVM Life Check – Technical Presentation05/01/2023 1

TVM Life Check [TLC] - A Technical Overview

Emmanuel Fernandes, Hardware Engineering


• TVM Life Check – Features

• Hardware Architecture

• Some Pictures

Agenda


Goals:- Offer an independent tool to test and measure TVM track circuits- Modular approach in order to offer future expansions- A tool entirely design and manufactured at ERTMS Solutions to be completely

independent from track circuits manufacturers (CSEE/ANSALDO)

TVM Life Check system is composed of the following six sub-systems:

1. TVM Life Check – Features

- TLC/ICC Module: to measure shunted track circuits currents |Icc|

- TLC/ZT Module: to measure transversal impedances

- TLC/EPI: to measure EPI loops (TVM-300)- TLC/BSP: BSP loops measurement (TVM-430)

- TLC/ODO Module: odometry module (Wheel Sensor/Doppler Radar, GPS-IMU)

- TLC-SYS Module: (SOFTWARE) control and data analysis

- TLC-AMI/AMD: Alarms for corrective maintenance [OPTION] Under development


TLC/ICC: measurement of the track circuits shunted current by measuring the inductive magnetic field radiated by the currents on the rails.

- Icc shunted current at the first axle (as in the picture):

Icc (f=1700, 2300, 2000, 2600 Hz)

Icc

TVM/2G or TGV/PSB Sensors



TLC/ICC – Measurement Targets for preventive and corrective maintenance:

- Minimal Level: verify that |Icc| > 0.8 A on all active segments except JES/JIC (or any other maintenance targets)

- Longitudinal crosstalk: verify that in the side segment |Icc| < 0.32 A (or any other maintenance targets)

- Transversal crosstalk: check that on adjacent tracks |Icc| < 0.16 A (or any other maintenance targets)

F1 = 1700 Hz F2 = 2300 Hz F1 = 1700 Hz F2 = 2300 Hz

F3 = 2000 Hz F4 = 2600 Hz F3 = 2000 Hz F4 = 2600 Hz

Longitudinal crosstalk: F1, F2 presence in sidesegments on the same track

Transversal crosstalk: between two different tracks



Crosstalk illustration:



TLC/ICC : Measurement methodology

- Simultaneous measurements of the four frequencies 1700, 2000, 2300, 2600 Hz on the same signal (on the same segment):

- Sampling time/measurement frequency: 1 ms (1 kSa/s)



TVLC/ZT: Transversal impedances measurements – Detection of the compensation capacitors and JES elements.

Icc

Compensation capacitors

Measured Icc with capacitors every 80/100m

Icc on a non-compensated track

22 µF



Purpose:

- Detect the presence of any transversal impedance : capacitors and JES elements like DB, BU, SVAC, SVPMM.

- [OPTION, under dev] Measuring the complex impedance Z of the transversal dipole it is possible then to distinguish the transversal dipole and detect in a precise way the nature of the problem

22 µFTrack circuit transversal dipole Impedance at 25 kHz [W]Compensation capacitor C=22 µF Z = -0.29iBloc d'Accord F1=1700 Hz (BUf1) Z = 6.42iBloc d'Accord F2=2300 Hz (BUf2) Z = -0.041iSVPMM (Self Mise au Rail Structure Métalliques) Z = 51.8i

Zt



TLC/ZT: Methodology

1. Emission of a 25 kHz carrier 2. Reception of the 25 kHz after inductive couplingANT TX Track RX ANT



No transversal dipole present in-between the front and rear axles:

- In the eight-shaped RX antenna the EMF is zeroed due to the inverse loop windings

I1 @ 25 kHz

I2 @ 25 kHz I1

I0 @ 25 kHz

I1



I1 ZtI2 @ 25 kHz

I1

I0 @ 25 kHz

Transversal dipole in the middle of the RX antenna:

- EMF appears in the left side of the RX antenna unbalance at the eight-shaped loop

- Maximal unbalance when the dipole is in the middle of the RX antenna

Inductive magnetic field B is present hereInductive magnetic field B is NOT present here (or very week)

I1



- Measuring the unbalance gives only the presence of the transversal element.

- The analysis needs a human intervention and some good expertise to make a diagnostic of the type of failure (like in the IRIS train).



TLC/EPI: Measurement of the EPI (TVM-300) loops:

- The envelope (level of the signal) and the frequency of the loop carrier are measured.

n° Hz1 1318,42 1459,23 16004 1740,85 1881,66 2022,47 2163,28 23049 2444,8

10 2585,611 2726,412 2867,213 300814 3148,8

Central EPI sensor

CW carriers: Each unique frequency codes a message

(14 available)

F=2444,8 Hz track is clear



When signal is present (Signal Detection), the instantaneous frequency is measured.

- One precise measure of the frequency quality/stability of the CW frequencies

- Possibility of detection of frequency/phase stability this could have an impact on the message availability.



BSP demodulator/decoder architecture

- Detection of BSP signal (carrier detection)

- Measurement of the two components 62.5 kHz and125 kHz

- Demodulation and bit extraction (4807,7 bits/s) (Tbit = 208.0 µs)



TLC-ODO: Odometry Module

Two options are possible (requested by two different clients):

- A Wheel Speed Sensor sending +-90° phase shifted signals coding speed, distance and direction. An odometry re-calibration is performed each time the train passes exactly over some EPI/BSP loops (significant elements on the track at well known position)

- If no wheel sensors A GPS/IMU (GPS + Inertial Measurement Unit).

In both cases: a position re-calibration using well known fixed elements in the track (EPI,BSP Loops, Balises, etc..)



TLC/SYS: Control and Analysis module

Powerful PC workstation containing:- the Command and Control Unit [CCU]- Signal Processing Unit [SPU]- Alarms Management Unit [AMU] [OPTION under dev]

Server (Workstation)

Visualization Software



TLC/AMI/AMD: Maintenance Alarm Module

[OPTION] Possibility of real-time transmission using:

- SMS- 3G/4G TCP/IP connections

of detected alarms and values out of nominal values (depending on pre-defined maintenance targets)

All alarm messages are geo-localized and timestamped



2. TVM Life Check – Hardware Architecture

Sub-systems installed in a 19” rack bay:

UPS

TLC - SYS

TLV ICC / TLC – EPI/BSP

TVMLC – ZT

RouterGPRS/3G/4G

TVMLC - ODO

TVM SENSORS

EPI/BSP SENSORS

ANT TX 25 kHz

ANT RX 25 kHz Speed

Sensors

CONSOLE

RACK 19’’

230 V AC / 1000W


3. Some pictures

Measurement of ICC shunted currents on the track – Two adjacent segments with 2000-2600 Hz frequencies


3. Some pictures

Measurement when passing over an electrical joint (JES)


3. Some pictures

A crossover: transversal crosstalk in visible at the switch


3. Some pictures

Track circuit instantaneous frequency is also evaluated


3. Some pictures


TVM Life Check – Technical Presentation

3. Some pictures

TVM Life Check – Technical Presentation

Thank you for your attention!

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