1. SRS for tramway and busses
Nicolae Dragu
12/10/2016

2. Origins of SRS A new solution based on a successful technology
Derived from APS, service-proven over 12 years
More than 350 trams sold with APS on-board
144 km of tracks sold equipped with APS rail
Over 18 million km run
First APS project in service: Bordeaux 2003
Latest APS project in service: Dubai 2014

3. What is SRS? Description
A ground-based static charging system for trams & electric buses equipped with on-board energy storage
On-board: current collectors under the vehicle
Trackside: cabinet installed at passenger stops
Ground: street-level conductor rail (or pads) at passenger stations

4. What is SRS? Description
In-station cabinet controls and feeds the street-level power rails
Compact for easy integration into tram/bus stop shelter
Front view
Top view

5. What is SRS? Operating stages
The power rail continuously emits a coded signal and allows the vehicle to position itself
The vehicle detects the ascending signal from the rail and stops over it

6. What is SRS? Operating stages
The collector shoe is then automatically lowered

7. What is SRS? Operating stages
The vehicle sends a coded signal enabling the energisation of the rail
The battery/supercapacitor recharge begins
Energisation of the SRS rail = APS functional and safety principles proven over 12 years of operation and validated by 5 certification bodies

8. What is SRS? Operating stages
The charging current is then interrupted
The signal from the vehicle to the ground is stopped

9. What is SRS? Operating stages
The rail is un-powered and the collector shoe is raised before the tram moves off

10. What is SRS? Description
In-station cabinet controls and feeds the street-level power pads
Compact for easy integration into bus stop shelter
Front view
Top view

11. What is SRS? Operating stages
Power pads continuously emit a radio coded signal and allow the vehicle to position itself
Vehicle detects the ascending signal from the pads and stops over it

12. What is SRS? Operating stages
The collector shoe is then automatically lowered

13. What is SRS? Operating stages
The vehicle sends a radio coded signal enabling the energisation of the rail
The battery/supercapacitor recharge begins
Energisation of the SRS rail = APS functional and safety principles proven over 12 years of operation and validated by 5 certification bodies

14. What is SRS? Operating stages
The charging current is then interrupted
The signal from the vehicle to the ground is stopped

15. What is SRS? Key features
Based on APS principle: same components for both location control and energization (with bi-directional communication)
Power rails contain conductive segments and antennae
Collector shoe contains contact power strips and antennae
Cabinet contains power contactors and emitter/receiver of the signals
SRS is an all-in-one system: no need for extra signalling or vehicle detection devices
Differentiator: control and energisation within the same equipment

16. What is SRS? Key features
The power required depends on the type of application:
An on-board supercapacitor to charge in less than 20 seconds at passenger stations or
An on-board battery to charge during several minutes at each terminus of a bus line
SRS for tram: designed for 1500 A / 750 V during 20 seconds

17. Customer benefits
Ground-based solution vs. overhead charging solutions
Easy urban insertion with compact solution
No height constraints on vehicles
By contact vs. inductive charging solutions
Fast and efficient energy transfer
Lower vehicle and infrastructure cost/complexity
Proven, safe and reliable technology
Derived from Alstom’s APS solution