MODERNISATION OF TRAMS IN ESTONIA
 
JUHAN LAUGIS, TONU LEHTLA, ELMO PETTAI, JÜRI JOLLER, ARGO ROSIN, MADIS LEHTLA, DMITRI VINNIKOV
   
Abstract:
Modernisation of trams in Estonia started in 1997. The new feasible and intelligent traction drive for Czech trams type KT4 was implemented in 2000. After that was developed new onboard auxiliary power system. Until now 22 IGBT transistor-based traction drives and 12 power converters are implemented. Solution has demonstrated good reliability. In 2002 - 2004 was developed tram intelligent control and diagnostic system. The new control system replaces existing old onboard control system. The first renovated tram is ready to operate.
   
Key Words: Tram control system, traction drive, DC/DC auxiliary power converter, programmable controller, onboard computer, passenger info system.
   
 
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