恒、变磁通共铁心的自耦变压器的研制

A Novel Design of Auto-Transformer with Common Core for Constant Flux and Variable Flux

针对相近电压等级电网互联时，自耦联络变压器效益系数太低设计难的问题，本文提出了一种恒、变磁通共铁心的自耦变压器设计方案，通过多种工况的三维电磁场仿真计算，求解了采用共铁心结构的自耦变压器在空载运行时的铁心主磁通分布、各绕组电压，以及短路时的各绕组电流、变压器短路阻抗等重要参数。仿真和估算结果基本吻合，证明了采用该结构的可行性。采用这种全新结构的变压器，能有效节省主材成本、降低空载损耗及减轻产品运输重量，而且由于简化了产品结构，更便于生产加工，提升了产品运行的安全可靠性。

When the power grids with close voltage levels, the design of tie auto- transformer would become difficult due to the low effectiveness coefficient. This paper proposes a novel design of auto-transformer with common core for constant flux and variable flux. Through three-dimensional electromagnetic field simulation and calculation,the no-load main flux distribution, voltages of windings as well as important parameters such as winding short-circuit currents and short-circuit impedance of the transformer are analyzed calculated. The simulation results basically coincide with the results from estimating, which illustrates the feasibility of the new structure. By adopting this transformer with new structure, the primary material cost and no-load loss as well as transport weight can be effectively reduced. Furthermore, with simplified structure, the transformer can be manufactured with lower difficulty level, and the operation reliability would be enhanced consequently