Re: Near miss at Victoria (London)

[jjjim <jjjim@bigpond.com>]

Yes thats right,  you need a fireld then you put a resistance across the
comutators, the motor acts as a generator,  the resitance as a load .. slowing it
down :P

Chris Downs wrote:

> On the 1st point I thought you needed to "excite" the motors to commence
> regen..  Therefore if there is no external supply can you commence regen.
> braking?
>
> As for the other 2 points they were just suggestions.  The input of anyone
> with techo knowledge would be appreciated.
>
> Chris
>
> jjjim <jjjim@bigpond.com> wrote in message
> 3A59BE2C.758A4B7E@bigpond.com">news:3A59BE2C.758A4B7E@bigpond.com...
> > Regnot sure what your saying,  but  Regen braking uses power in cases i know
> of,
> > specially in AC ,  but even DC motors can use reverse current instead .
> on the
> > EMUs  the emergency break almost  shorts the DC motors apparently (according
> to
> > afriend who works at QR)  and the resitor glows red hot hehe
> >
> > Chris Downs wrote:
> >
> > > What stops the train from producing a current from regen. braking?  Regen.
> is
> > > inoperable (no power available to initiate regen. or it's deliberately
> made
> > > inoperable or unreceptive overhead prevents it use or ?) if the overhead
> is
> > > dead?
> > >
> > > Chris
> > >
> > > jjjim <jjjim@bigpond.com> wrote in message
> > > 3A56B05E.4A8A771F@bigpond.com">news:3A56B05E.4A8A771F@bigpond.com...
> > > > Yeah exactly . the trains still going to roll , and in the case of
> trains
> > > > that use the traction motors for Braking,  there would be now only air
> > > > brakes to tread on :/
> > > >
> >