![]() To determine the polarity of the windings must inject a known signal, not necessarily power, since the measurement is performed with the transformer without load. ![]() How to determine the polarity of the windings? This is because the magnetic flux generated voltages in phase opposition which are subtracted from each other. If connect the terminals that do not have the same polarity, the total voltage (between the end terminals) will be very close to zero volts. With this data it is possible to connect terminals 4 and 5 for what is shown in the following figure: This means that when the terminal 3 is positive, it is also the terminal 5. In the figure, the plotted point indicates the terminals having the same polarity at any given instant. In order to make this connection, it is vital to know the relative polarity of each winding. I understand what you want to do is connect the two secondary in series, to obtain an output of 20-0-20 V. ![]() This transformer has a primary (terminals 1 and 2) and two secondary (terminals 3 and 4 terminals 5 and 6). I understand that you mean a transformer like the one shown in the following figure: ![]()
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