Talk:Three-phase AC railway electrification

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Who knows more? Source is the article in the German Wikipedia.

Rename[edit]

I will change the article to “Three-phase AC railway electrification” to cover the Swiss and American systems as well, rather than merging into the main FS article on Italian Railways. Hugo999 (talk) 04:26, 7 June 2011 (UTC)[reply]

I think that Railway electrification system#Polyphase alternating current systems already more adequately covers the topic; Three-phase AC railway electrification could be a redirect page to that section.
As for the merge, I'd agree with the original proposal to merge this into Ferrovie dello Stato. Tim PF (talk) 21:07, 7 June 2011 (UTC)[reply]

Individual countries/lines[edit]

paras to be added Hugo999 (talk) 03:07, 29 June 2011 (UTC)[reply]

A 3-phase system should be still in use in the underground train line 1 in Milan, one us overhead, one on the rail side and third in the middle of 2 rails. (exactness to be checked) alberto.palma1972@gmail.com — Preceding unsigned comment added by 212.243.64.227 (talk) 16:19, 17 April 2012 (UTC)[reply]

Third Rail Potential[edit]

Is it the same as in overhead wires or is it the same as earth? You know, earth potential as in "corner grounded delta".

This could be a very logical safety feature. — Preceding unsigned comment added by 88.195.7.227 (talk) 20:02, 26 October 2012 (UTC)[reply]

By "third rail", I think you mean the running rails used for the third phase. I believe you are right about the use of a corner grounded delta because the running rails must be kept at earth potential both for safety and to avoid current leakage. Mock wurzel soup (talk) 15:47, 13 February 2018 (UTC)[reply]

1 phase OHL 3 phase motors[edit]

What about Indian locomotive class WAP-5 2.28.255.194 (talk) 13:16, 12 October 2014 (UTC)[reply]

This uses solid-state convertors so it is outside the scope of this article. Mock wurzel soup (talk) 15:38, 13 February 2018 (UTC)[reply]

Motor brushes[edit]

Quote: "The locomotives use three-phase induction motors. Lacking brushes and commutators, they require less maintenance". Is this correct? Since the early 3-phase locomotives used cascading for speed control there must have been electrical connections to the rotor so there must have been slip rings and brushes. Mock wurzel soup (talk) 15:35, 13 February 2018 (UTC)[reply]

More clarification needed[edit]

This article lacks a basic description of how three-phase motors work. Readers without expertise in the area will want to know what the three phases are, what happens during the sequence of phases, how this differs from conventional electric motors, and what benefits (if any) besides regeneration there may be. A circuit diagram might help. Blixton (talk) 16:07, 25 April 2019 (UTC)[reply]