Talk:Kálmán Kandó

Father of the electric train

Kandó may well be known in Hungary as the "father of the electric train" but there are other claimants to this title, e.g. Robert Davidson, Magnus Volk and Frank J. Sprague. Biscuittin (talk) 15:09, 14 July 2009 (UTC)

Kandó's electric locomotives were full sized, 60-100 ton vehicles, which worked in regular service for decades and were series produced (dozens of them). These achivements are not matched by other early inventors. His idea of using 3-phase asynchronous electric drive motors made TGV and shinkansen possible, because direct current and single-phase AC propulsion systems cannot produce the speed or match the flexibility of 3-phase drive. 91.82.243.142 (talk) 21:46, 15 September 2009 (UTC)

Valtellina line

There is a disagreement about the voltage used for the electrification. According to Valtellina it was 3,600 volts but according to List_of_current_systems_for_electric_rail_traction#Overhead_.28three-phase.29 it was 3,000 volts. Biscuittin (talk) 09:08, 15 July 2009 (UTC)

It is common to play with catenary voltages, 10-20% extra is not a big problem. If they want more power they just up the voltage a bit. When the TGV made the 571km/h record run, the french topped the catenary to over 30 kilovolts compared to the standard 25kV, to be able to give enough juice to the motors. Probably Valtellina wanted a bit more power from the locomotives, so they adjusted the overhead to 3600V later on (20 percent extra)? As long as the insulators hold, it's not too difficult. 91.82.139.5 (talk) 19:46, 17 October 2009 (UTC)

I think you are right. Three-phase AC railway electrification shows the following:

• 3,000 V / 15 Hz Ferrovia della Valtellina 1902 - 1917
• 3,000 V / 15.8 Hz Valtellina FS 1917 - 1930
• 3,600 V / 16.7 Hz Valtellina FS 1930 - 1953

It seems they gradually pushed up the voltage and frequency. Mock wurzel soup (talk) 20:29, 17 February 2018 (UTC)

Adjustable resistor

Quote: "In-between speeds were maintained by connecting a water and saltpeter based adjustable resistor to the line..." I think it would have been connected to the motor armature via slip-rings, not direct to the line. Biscuittin (talk) 19:14, 3 November 2009 (UTC)

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