Talk:Three-phase AC railway electrification

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

Rename

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

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

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

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

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

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]

why is the system said to be less complicated in the case of rack railways?

How is it less complicated to install a pair of wires above rack railway than any other kind of railway? A source for this claim is not provided, and following the links to the train systems named in the article show overhead wires that seem to be exactly as complicated as every other example. If the claim is true, then a source should be cited (otherwise, of course, the claim should be removed). Perhaps someone believed the rack could provide the third conductor, but that is clearly not the case since the systems have pairs of overhead wires. 133.11.21.115 (talk) 01:43, 20 May 2024 (UTC)[reply]

Just think, and you'll have the answer...

What makes the wiring complex is the switches.

Typically, a rack railway has very few switches (do I have to explain why?). 2A02:8429:2966:9001:785D:DCBD:A00F:4BAF (talk) 09:51, 30 September 2024 (UTC)[reply]