Re: Overhead wires for LRT [wasOld Timer on Sydney Light Rail
John McCallum (mccallum@melbpc.org.au)
Tue, 22 Jul 97 10:56:27 GMT
In article <5qtjer$5fa$1@nntpd.lkg.dec.com>,
pierson@gone.enet.dec.com (dave pierson) wrote:
>In article <33C76D81.270ED190@progsoc.uts.edu.au>, Cam
><"cam[NoSpam]"@progsoc.uts.edu.au> writes...
>
>>> Yes the overhead [for the new Sydney Australia LRT line] does appear
>>> to be for normal pantograph operation,
>>> > however what is different is that; double contact wire has been hung.
>>> I would be interested to know why this is done, too. The new tramway
>>> system at Sheffield UK uses this kind of double-contact wire, as do some
>>> of the new French tramway systems, ie Rouen. The contact wire used seems
>>> thicker than the single wire used on most tramway systems.
There is another reason for using twin contact wire. Using two wires
effectively doubles the conducting area, thus reducing voltage drop under
heavy current. Therefore, the use of twin contact wires in Sydney may be more
to do with using only one substation rather than two, which might otherwise be
required.
Cheers,
John McCallum
e-mail address: mccallum@melbpc.org.au
Phone 03 9478 4254. Member, Melbourne PC User Group.
And they were both naked, the man and his wife, and were not ashamed.
(Genesis 3,25)