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Re: What's that noise?
- Subject: Re: What's that noise?
- From: David Johnson <trainman@ozemail.com.au>
- Date: Fri, 14 May 1999 01:34:58 +1000
- Newsgroups: aus.rail
- References: <Pine.SOL.3.96.990428101855.9453G-100000@minyos.its.rmit.edu.au> <u4uV2.21365$MB3.29211@newsfeeds.bigpond.com> <Pine.SOL.3.96.990429161743.16637F-100000@minyos.its.rmit.edu.au>
- Reply-To: trainman@ozemail.com.au
Gareth Lumsden wrote:
> So basically it is the simple theory of electrons flowing, then 'jumping'
> across the line-breaker when it is opening. Much the same thing when a
> tram is powering over a cut off point - A large arc 'jumping' between the
> contact wire and the overhead. Comeng trains just make a louder noise
> because there is more voltage. Have I got it right?
More voltage, but more specifically more current. Some high current DC CBs have
a blast of air to blow the arc out an arc chute which also makes noise.
--
David Johnson
CityRail Guard
trainman@ozemail.com.au
http://www.ozemail.com.au/~trainman/