Current going into the primary of the transformer and current leaving the secondary of the transformer are of the same polarity. This is shown on the transformer symbol as dot.
The upper circuits show Subtractive polarity and the lower circuits show Additive polarity.
The ANSI symbols for Primary and Secondary are H1, H2 and X1,X2,X3 etc respectively.
If the terminal marked X1 is also on your left, it is subtractive polarity. If the X1 terminal is on your right, it is additive polarity. Additive polarity is common for small distribution transformers.
Ref:-
1. http://en.wikipedia.org/wiki/Polarity_(mutual_inductance)
2. http://electrical-engineering-portal.com/understanding-transformer-polarity
The upper circuits show Subtractive polarity and the lower circuits show Additive polarity.
The ANSI symbols for Primary and Secondary are H1, H2 and X1,X2,X3 etc respectively.
If the terminal marked X1 is also on your left, it is subtractive polarity. If the X1 terminal is on your right, it is additive polarity. Additive polarity is common for small distribution transformers.
Ref:-
1. http://en.wikipedia.org/wiki/Polarity_(mutual_inductance)
2. http://electrical-engineering-portal.com/understanding-transformer-polarity
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