Transformer Wiring and Principle
In the three-phase transformer, each core is wound around the original winding and the secondary winding, the equivalent of a single-phase transformer. Three-phase transformer high-voltage winding commonly used A, B, C, the end with X, Y, Z to represent . The low-voltage windings are represented by a, b, c and x, y, z. The high and low voltage windings can be connected in star or triangular lines, respectively. In low-voltage winding output for low voltage, high current three-phase transformer (such as plating Transformers), in order to reduce the low-voltage winding wire area, low-voltage winding also has six-phase star or six-star star connection.
China's production of power distribution transformers are used Y / Y0-12 or Y / triangle -11 two standard wiring method. The number of 12 and 11, said the original winding and secondary winding line voltage difference, that is, the so-called transformer wiring group do not.
Three-phase transformer works: the basic working principle of the transformer is the principle of electromagnetic induction. When the AC voltage is applied to the primary winding, the AC current flows into the winding to generate the excitation effect, and the alternating magnetic flux is generated in the iron core. The alternating magnetic flux passes through the primary winding and passes through the secondary winding , Which induces the induced electromotive force in the two windings, respectively. At this time if the secondary side and the external circuit load connected, there will be AC ??current out, so the output power.
