Simulation of the Magnetic Field Distribution and Voltage Error Characteristics of the Three-Phase Three-Component Combined Transformer With New Three-Cylinder Core Structure

The disadvantages of the traditional three-column core structure three-phase three-component (TPTC) transformer are its incomplete symmetry, the different magnetic circuit length, and the coupling parameters, which lead to each phase voltage error varying differently. In this article, a new structure optimization design of a new type of three-phase three-element combined transformer with a new three-cylinder core structure was proposed. The simulation analysis of the magnetic field distribution and the voltage error characteristics of the voltage transformer with the new three-cylinder core structure was carried out. Compared with the traditional three-column core structure TPTC transformer, the magnetic induction intensity distribution of the voltage transformer with the new three-cylinder core structure is more uniform. The simulation results of the voltage error characteristics under normal load condition also show that with the increase in voltage, the voltage error of the voltage transformer with the three-cylinder core structure changes gently, and the error difference between the three phases is smaller. The TPTC combined transformer with the new three-cylinder core structure has better error characteristics under normal load conditions.