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Reconstructed trams: T3R.PLF Power electronic controlled Vznik typu T3R.PLF • Trams of the type T3 were producted in more 14000 pieces– • The resistance current control was changed in electronic puls current control. They are many variants – Example is type T3R.PLF Petr Sýkora pro X14EPT 2 Transport parameters • 22 sittig places • 105 standing places • Place for baby cars and for disabled people cars • Flore elevation above platform 350 / 860 mm • vmax 65 km/h • Information systém for passengers Petr Sýkora pro X14EPT 3 Mechanics • • • • Car length 15100 mm Car width 2480 mm Car high 3190 mm Empty car mass 20,5 t Petr Sýkora pro X14EPT 4 Petr Sýkora pro X14EPT 5 Vozová skříň • Car body quite new. • Partly low floor Petr Sýkora pro X14EPT 6 Petr Sýkora pro X14EPT 7 Bogie and drive • • • • Bogie the same as in T3 Drive arrangement the same as in T3 Higher motor output Body spring arrangement the same like in T3 Petr Sýkora pro X14EPT 8 Petr Sýkora pro X14EPT 9 Brakes • Electrodynamic brakes motor are loaded into resistances – Main brake • Elektromechanical disk brake on the traction motor shaft – Pressure on braking plates by springs / electromagnet release of braking by electromagnet. It serves for parking and emergency case. • Elektromagnetical friction rail brake Emergency Petr Sýkora pro X14EPT 10 Petr Sýkora pro X14EPT 11 Elektric equipment and axiliary drives • Cooling ventilators are driven by asynchronous motors supplied by frequency convertors • Car network 24V= from battery. Charched from electronic convertor Petr Sýkora pro X14EPT 12 Petr Sýkora pro X14EPT 13 Electric equipment – traction drive • Traction DC motors are the same but have insulation in class H. Output is higher44 kW • TM are supplied with electronic pulse converters – Energy saving – Easier mentanance ~ minimum kontacts Petr Sýkora pro X14EPT 14 TV Progress • Electronic converter with 6 transistors for current pulse control. IGBT transistors. • Converter controls traction motor current and excitation current in both revolutions (back and head) in driving and braking regimes. Petr Sýkora pro X14EPT 15 Petr Sýkora pro X14EPT 16 Scheme of power convertor part T1 ÷ T6 ~ IGBT with revers diods Lb ~ Excitation winding K ~ Motor anchor Ib ~ Excitation current measurement Ik ~ Anchor current measurement +/- ~ DC cercuit voltage Symetry with respect K for opposite driving Petr Sýkora pro X14EPT direction. Both directions 17 Driving regime – driving with power •T4 switched. Driving direction •T5 pulsates and controls traction current • Symetry in case of opposite driving direction. In such a case T1 will be continuasly switched on Petr Sýkora pro X14EPT 18 Driving regime – free driving •T5 switches off and T6 opens. The current quickly dissapears. • Symetry in case of opposite driving direction. Petr Sýkora pro X14EPT 19 Driving regime – field weakaning •T3 swithes on and pulsates • Symetry in case of opposite driving direction. Petr Sýkora pro X14EPT 20 Driving regime - excitation •T1 switches on and pulsates • Symetry in case of opposite driving direction. T1 is switched on and T4 pulsates Petr Sýkora pro X14EPT 21 Braking regime – anchor is short circuited against excitation winding • T4 je switched off. • T1 is switched on. Traction motor is quickly excited. • Symetry in case of opposite driving direction. Petr Sýkora pro X14EPT 22 Braking regime – energy recovering •T1 is switched off and the anchor current recovers the enrgy into DC circuit and from DC cercuit into trolley, if it is possible. Otherwise the energy is burned in the braking resistance. • Symetry in case of opposite driving direction. Petr Sýkora pro X14EPT 23 Braking regime– exciting current is never sudenly switched off •When T1 switches off the exciting current is maintained with diodes in T3 and T2 Petr Sýkora pro X14EPT 24 References • • • • • www.prazsketramvaje.cz www.cegelec.cz www.pragoimex.cz www.kos.cz Patent CZ 8766 U1 Petr Sýkora pro X14EPT 25