Original poster: Justin <rocketfuel@xxxxxxxxxxxxx>
Today I played with my 2 new potential transformers (60:1 ratio for
120V/7500V)
and I measured something which has me stumped.
With the two transformers not connected to eachother, I reduced the voltage
to 1V with my variac and measured 60V on each secondary, which I expected.
However, When I started measuring voltages between the two transformers,
I got values I wasn't expecting. For example, if transformer A has HV
terminals labelled 1 and 2, and transformer B has terminals 3 and 4, this
is what I found:
1-2: 60VAC
3-4: 60VAC
2-4: 1VAC
1-3: 1VAC
2-3: 20VAC
1-4: 20VAC
Now the 1VAC I was seeing between 2-4 and 1-3 I understand, but why 20V
between 2-3 and 1-4? I was expecting 120V, although I know from reading
about other people's configurations that 1-3 or 2-4 are typically
connected, and indeed connecting them together did produce 120V on the
non-connected terminals.
What I don't understand is why I got the 20VAC reading when they were
not connected together!
Any help in explaining the fundamentals here would be greatly
appreciated.
Thanks!
Justin