Talk:Overhead line

Trains Start‑class Low‑importance

Trains Portal

This article is within the scope of WikiProject Trains, an attempt to build a comprehensive and detailed guide to rail transport on Wikipedia. If you would like to participate, you can visit the project page, where you can join the project and/or contribute to the discussion. See also: WikiProject Trains to do list and the Trains Portal.TrainsWikipedia:WikiProject TrainsTemplate:WikiProject Trainsrail transport

Start

This article has been rated as Start-class on Wikipedia's content assessment scale.

Low

This article has been rated as Low-importance on the project's importance scale.

Where should this be moved to? overhead line? overhead lines? overhead power transmission? --Robert Merkel

Comparison with streetcar/tram style lines could be interesting

I'm curious about what differences there might have been with old equipment used for streetcars. A lot of those vehicles had straight collection arms (instead of pantographs) with pulley-style wheels on the ends. Managing a transition between breaks would seem to be more difficult, and speed would seem to be an issue (although I know such systems ran at up to 100 km/h in the early 20th century in my region of the U.S.—possibly not over breaks, but certainly in between them). —User:Mulad (talk) 14:06, Sep 29, 2004 (UTC)

History

I removed this:

The use of overhead cables conducting electricity, invented by Granville T. Woods in 1888, amongst several other improvements by Woods, led to the development of electrified railways, the first of which was operated at Coney Island from 1892.

What? By 1888 Sprague's Richmond installation was already running. An amateur named John C. Henry used overhead copper cable to power his experimental car in 1884. And overhead wire was neither the first development, nor the critical one, in developing electric railways.

Woods' invention

For those curious, Woods' invention was not of the use of overhead wire for powering electric railways, but of an improved wire carriage (or "troller" or "traveller" designed to ride on top of a wire. These had previously been in use by other inventors, but Woods' invention was of an improved type with three wheels on a single wire and flanges, all apparently to address the problem that trollers had in falling off the wire. He did not submit a model, so I don't know that his design was ever tested.

The upshot is, that once sprung trolley poles were successfully deployed, all trollers became obsolete. -- Cecropia | explains it all ® 18:07, 25 Feb 2005 (UTC)

I am still new in this electrical knowledge, but somehow can someone tell me the differences between LRT and trams?

LRT and Trams.

I am still new in this electrical knowledge. But can someone tell me the differences between LRT and Trams?

Power Grids

please somebody help me out ....regarding what is proper functioning of power grids in india/US?

Ring Main Units Working

could somebody explain me about the ring main units working and about the construction of Ring main units..

Ajay Bhargove NDPL

Merged

Overhead line, Overhead catenary, and Overhead cable are very similar (but not the same). These three articles should be reshuffled/reorganized/merged ito some sensible configuration. --Smack (talk) 17:29, 27 August 2005 (UTC)[reply]

Agreed

Its a little confusing to have three seperate articles about similar subjects. Why not have one article with three seperate sections? Piercetp 06:45, 25 May 2006 (UTC)[reply]

Merged

Merged as requested. SilkTork 22:09, 29 May 2006 (UTC)[reply]

Both Diagrams?

Do we really need both of these diagrams? They seem both the same to me. I am removing the first one, if you disagree, please revert without warning on my talk. I won't dispute this.martianlostinspace 14:06, 21 December 2006 (UTC)[reply]

Germany

It seems there are mixed up together "supply-lines" and the otherwise built "traction current lines". There are for example no "four lines on the lowest crossbar" of a "traction current line". The supply current lines have 110 kV power, the traction current lines is transformed down to 15 kV power. I live in Germany and I have never seen "eight conductor cables" on "traction supply lines". Regular are two lines for 110 kV supply and one line for direct supply of the traction line. The other bzw. feedback-"wire" then is the earth. Better kill the whole section "Germany"- it`s mostly wrong! 62.109.75.136 08:28, 1 February 2007 (UTC)[reply]

Why is 16.7 Hz used in Germany?LorenzoB 18:37, 7 April 2007 (UTC)[reply]

The reason for the frequency is apparently a Legacy from before the days of Power Electronics. One can allegedly practically operate a DC motor directly from this frequency but not 50 Hz.

86.18.84.41 20:48, 10 April 2007 (UTC)[reply]

Exactly correct. In the US, we got by with 25 Hz for the same reason. The basic problem is the inductive reactance of the traction motors.

Atlant 22:31, 10 April 2007 (UTC)[reply]

Trams and trolleybuses

Why there is no info about tram and trolleybus wire rosettes like these? http://www.hiddenglasgow.com/forums/viewtopic.php?t=5438&postdays=0&postorder=asc&start=0&sid=b5c17cf1758724422cfc0b5542017a8c 213.240.234.212 20:45, 3 February 2007 (UTC)[reply]