Re: Near miss at Victoria (London)

["Aus Visitor" <if-u-know@cwcom.net>]

David Johnson wrote in message <3A566E88.58ED4F98@ozemail.com.au>...
>jjjim wrote:
>
SNI,  But u can image
>> the Arc  with to trains at full power,  on a 22Kv line.   So id say  they
>> are only used as 'definate' isolation of power,  rather than cutting
power
>> while online
>
>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

Yes it does - though the current is often over 50 amps on a 25KV line - it
feeds a longer section hence more trains drawing current.  Also the 25 KV is
AC so the ARC is self extinguishing.  For the DC breakers they have
compressed air to blow the ARC out!!  Oh its also noisy when they blow as
well!!

AV