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CTScott · 06-03-2009, 10:56 PM

Split phase isn't two-phase. Two phase went obsolete (except for within some industrial control systems) with the advent of three-phase. The trains run on single phase, rather than three phase, because it requires only one contact (and the track as a ground) three phase would require three sets of contacts touching three separate wires.

GeneW · 06-04-2009, 08:01 AM

Quote:

Originally Posted by CTScott

Split phase isn't two-phase. Two phase went obsolete (except for within some industrial control systems) with the advent of three-phase. The trains run on single phase, rather than three phase, because it requires only one contact (and the track as a ground) three phase would require three sets of contacts touching three separate wires.

Trains also have enough inertia in their systems that they didn't really need multiphase sources. With modern power systems its pretty easy to convert between sources with minimal losses. Today someone can design a delivery system to suit her or his requirements, put in power conversion and then set up the motor or drive systems as they please. Things are different today then they were even twenty years ago.

Gene

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06-03-2009, 10:56 PM	#1
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	Split phase isn't two-phase. Two phase went obsolete (except for within some industrial control systems) with the advent of three-phase. The trains run on single phase, rather than three phase, because it requires only one contact (and the track as a ground) three phase would require three sets of contacts touching three separate wires.