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Phasing Transformers ZW to KW

keyroutekenkeyroutekenOGR Forum Member

I know this has been brought up hundreds of times, but I phased my first two transformers this afternoon.  Tied the U-post commons together.  Clipped on an AC Voltmeter (Simpson 0-25 VAC) between the "B" post of the KW to the "A" or "D" post of the ZW.  With throttles off, voltmeter reads about 13-14 VAC..   When throttles are increased, voltage reads over 25 VAC..  When one of the line plugs are reversed in the power strip, everything drops down to ZERO (0) volts AC, even with throttles still on..

Sounds like I got it figured out OK, huh ?

 

KRK

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P phillyreadingOGR Forum Member

The U posts of the ZW and KW are not the same animal so to speak. The ZW's U is common and the KW's U is something else, look at the back of the KW for an idea.

I have most of my stuff in storage so I can't look at the transformers right now to tell you which is which.

I just moved so everything is crazy right now finding anything.

 

What I can tell you is that the post war ZW and Z have the same U for common power.

 

In order for the two common posts of two transformers to be in phase there should be zero volts between both common posts at all times. Otherwise they are out of phase.

 

Lee Fritz

Last edited by phillyreading

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