Re: Near miss at Victoria (London)

[jjjim <jjjim@bigpond.com>]

I would argue that :P

The 25KV arc would stretch quite a distance , Elec units here have vacum Breakers
Which are set to break power to the train before hitting an airgap,  if not the
arc would be drawn right thru the air gap because of the High voltage.  where as i
am led to belive sydney's DC trains dont have to have / need such a system,  could
be wrong but

David Johnson wrote:

>
>
> I would suggest a breaker or knife switch opening 25kVAC at 50 Amps would have
> a much smaller arc than opening 1500VDC at 1000 Amps.
>
> --
> David Johnson
> trainman@ozemail.com.au
> http://www.ozemail.com.au/~trainman/
> ------------------------------------
> These comments are made in a private
> capacity and do not represent the
> official view of State Rail.
> C.O.W.S. Page 11.