Re: Line beyond......

[David Johnson <trainman@ozemail.com.au>]

Paul Jones wrote:

> But if trains are built (or refitted) with ac traction motors, why would the
> trains need any sort of converter, besides perhaps a voltage transformer??

AC traction motors are three phase.   To get the three phases, the 25kVAC is
transformed, then rectified, then run through a variable voltage, variable
frequency static inverter.  There would be not much stopping them from changing
the existing pilot motor/resistor or chopper control units to the new system,
but space may be limited.   There is no talk of ACing the Sydney Suburban
system, but if they did, it would make Air Conditioning S sets simpler!


--
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.