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RE: Transformer secondary measurement

Posted by tesla (A) on August 5, 2013 at 19:16:54

In Reply to: Transformer secondary measurement posted by Cleet Torres on August 3, 2013 at 22:15:05:

From your example, you have a dual secondary. Normally, the primary and secondary do not have any kind of direct connection to each other or ground.

Sometimes there is a green ground lead making connection to the iron laminations of the transformer,so in case the insulation breaks down on either the pri or sec, the chassis the transformer is bolted to doesn't become energized. (However, your transformer has a ferrite core, and ferrite cores are not electrically conductive.)

What might be confusing you is that on tapped secondary power transformers, (Many power supply designs have transformers with a tapped secondary), the center lead is connected to either ground or a circuit ground, then the two other leads connect to diodes to rectify the AC current to DC. This example is a power supply. If you have a power supply with a center-tapped transformer secondary design, you can usually measure identical ohms readings between the center tap and the other secondary leads. Of course, you don't want to energize the the transformer while taking any ohms readings.

BTW, if you connected the two "inner leads" of your dual secondary trsnsformer, and then measured the voltage output of the two "outside leads" (the two secondaries would be connected in series), you should measure twice the voltage as in measuring just one secondary. This of course, assumes that both secondaries are identical. Now if you measured both secondaries connected to each other in parallel, (reminder, you have to connect them in the proper phase for both series and parallel connections), you would get the same voltage, but twice the current output.

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Edits: 08/05/13 08/05/13 08/05/13 08/05/13 08/05/13

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