Single-phase transformer Connections: Single-phase transformer can be connected mainly in series or parallel and 4 types ;Series-series, series-parallel and parallel-series.
Single-phase transformer Connections
Single-phase transformers can be connected many ways.
To start with, consider two single-phase transformers A and B. They can be connected in four
different combinations, provided that the polarities are observed.
Figure 1 illustrates a series-series connection where the primaries of the two transformers
are connected in series whereas the secondaries are connected in series.
Two Transformers with Primaries in Series and Secondaries in Series. (A) Connection
Diagram, and (B) Exact Equivalent Circuit.
Figure 2 illustrates the series-parallel connection and the parallel-series connection.
Note that when windings are connected in parallel, those having the same
voltage and polarity are paralleled. When connected in series, windings of
opposite polarity are joined in one junction. Coils of unequal voltage ratings
may be series-connected with polarities either aiding or opposing.
Figure 3 is Parallel-Series Connections for Single-Phase Transformers
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