| 摘要 |
A three phase transformer having a pair of additional coupled windings on the secondary side of each phase, with these coupled windings properly connected in series to develop a voltage in phase with a particular secondary voltage but driven from alternate phase primaries. The primary and secondary windings are connected in a Y or DELTA configuration. One coupled winding from each of the two phases, other than the desired secondary phase which is to be balanced, are joined in negative series so that when summed, they are aligned with the secondary phase being corrected. The series coupled windings are connected in parallel with the third secondary. The unbalanced current is split between the secondary winding and between the two coupled windings, each of which is coupled to the primary of another phase. The coupled winding combined voltages and resistances are approximately equal to the voltage and resistance of the secondary. The transformer design also reduces harmonics of the loaded phase by similarly transferring these harmonics to the other two phases based on the coupled windings. |
