Transformer Ground/Phase Question - ISO Bob Nelson

[Texas Pete]

I just got a Lionel LW transformer with which to power most of my accessories.  I use a couple of CW-80's to run the two-train layout and, up til now, the accessories.  The grounds are tied together so I can use an outside rail to return train and accessory power.  If possible, I would like add the common/return of the LW to the mix.  I would like to know if this is doable and whether or not it will be necessary to phase the LW to the CW-80's.  I vaguely recall reading here that phasing transformers is not necessary and may actually be undesirable.

Thank you for any assistance.

Pete

SORRY!  I used the search function, searched the word "phase," and now my head is stuffed with all kinds of fabulous informations.  Pulled the trigger too soon on the question.  Again, sorry.

[gunrunnerjohn]

Well, if the hot side will NEVER be connected to anything on the CW-80's, there's no need to phase the transformers, and having them not in phase will balance the power factor a bit better on the outlet.

 

[lionelsoni]

I agree, except for the part about the power factor, which will stay the same, not that it's a problem either way.

The power factor is the ratio between the real power drawn by the transformer and the product of the voltage and current into the transformer.  These numbers are different because of the magnetization current that a transformer draws, which lags the phase of the voltage by 90 degrees.  But that magnetization current is the same whichever way you plug the transformer in.