Re: Pantographs__&&__Interior__Lighting
citadis
Monday, June 24, 2002 9:19 AM
--- In TramsDownUnder@y..., "malrowe" <malrowe@r...> wrote:
Sorry Mal, as an operator/driver trainer/motorman or any other
description, I beg to differ, copied here is my reply to Jim on
another (Pittspurgh) list:
For a start, the Faiveley panto is a brand name but synonymous with
the "one
arm" panto to which you refer as they were the first (or the first
successful type).
The bouncing you refer to also happens with our Austbrek type one arm
pantos, what happens mostly is, when they go under frog pans of joint
trolley pole panto operation, at speed they bounce when they hit the
frog,
momentarilly loosing contact with wire. Where the trolley has been
modified
for panto only (route 109) with new overhead, this has been
eliminated.
The panto will also bounce on slack overhead, especially in summer
when the
wire sags, this is particular noticable on simple span and hanger
fittings
(again trolley pole) and the wire is high, at speed, the panto cannot
raise
quickly enough for the sudden peak at the hanger and shoots straight
across
(we are talking a couple of inches here), where the over head has been
replaced with suspended hangers (Kuhmler and Matter type), this does
not
happen, also, on out LRT lines that were once heavy rail, the simple
over
head at the start at the St. Kilda end, does this, but a few hundred
metres
in, the catenary starts from when the line was heavy rail (similar
o/h to
North Shore) and the pan is smooth as silk.
The bottom line is, the pan is not as responsive to height
fluctuations as
the trolley pole is.
Hope this helped Jim,
Greg in Oz
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--- In TramsDownUnder@y..., Jim Holland <pghpcc@p...> wrote:hung,Faiveley pantographs (believe this is the correct term forhalf-diamondpantographs) sometimes bounce along the overhead v\for variousreasons.
Virtually unheard of here. Perhaps the overhead is more evenly
but the only time you see an arc (the most obvious outcome of ais
temporary loss of contact) from the pantograph on a Melbourne car
when the driver fails to cut off power when crossing a section
insulator.
Mal
Sorry Mal, as an operator/driver trainer/motorman or any other
description, I beg to differ, copied here is my reply to Jim on
another (Pittspurgh) list:
For a start, the Faiveley panto is a brand name but synonymous with
the "one
arm" panto to which you refer as they were the first (or the first
successful type).
The bouncing you refer to also happens with our Austbrek type one arm
pantos, what happens mostly is, when they go under frog pans of joint
trolley pole panto operation, at speed they bounce when they hit the
frog,
momentarilly loosing contact with wire. Where the trolley has been
modified
for panto only (route 109) with new overhead, this has been
eliminated.
The panto will also bounce on slack overhead, especially in summer
when the
wire sags, this is particular noticable on simple span and hanger
fittings
(again trolley pole) and the wire is high, at speed, the panto cannot
raise
quickly enough for the sudden peak at the hanger and shoots straight
across
(we are talking a couple of inches here), where the over head has been
replaced with suspended hangers (Kuhmler and Matter type), this does
not
happen, also, on out LRT lines that were once heavy rail, the simple
over
head at the start at the St. Kilda end, does this, but a few hundred
metres
in, the catenary starts from when the line was heavy rail (similar
o/h to
North Shore) and the pan is smooth as silk.
The bottom line is, the pan is not as responsive to height
fluctuations as
the trolley pole is.
Hope this helped Jim,
Greg in Oz
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Risk Free!
http://us.click.yahoo.com/3PCXaC/PfREAA/Ey.GAA/DiTxlB/TM
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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/