Secondary Development Of MagNet Software Applied To Design Of Oil-Immersed Bridge Arm Reactor

With the continuous development and maturity of computer software and hardware,simulation technology has further promoted the application and development of Virtual Manufacturing in China's equipment manufacturing industry.In the transformer industry,major companies had built their own digital R&D platforms by developing simulation software such as Mag Net,Ansys and Maxwell etc.,which had helped them achieve low-cost,short-cycle and high-quality agile R&D methods.Simulation model construction,solution parameter setting and post-processing are very cumbersome,and the workload is extremely large and time-consuming.In Domain Engineering,it is a basic requirement to perform batch calculation and analysis on certain variable parameters in a specific value domain to obtain observation trend for achieving optimal design.Therefore,it is particularly important to carry out secondary development of these softwares to realize parametric simulation calculation.In this paper,the main implementation types of reactors and their saturation characteristics were analyzed.And the development route of oil-immersed bridge arm reactors based on magnetically-shielded air-core reactor was proposed.Afterwards,the electromagnetic calculation method of the oil-immersed bridge arm reactors and the calculation principle of the simulation software of the reactors were studied.Secondly,the Mag Net software was redeveloped based on Excel VBA language,realizing the functions of batch processing calculation,automatic pre-processing and post-processing and automatic report generation,which had significantly reduced the simulation intensity and improved the simulation efficiency.The numerical simulation of the saturation characteristics of the reactor in four dimensions of the yoke cross-sectional area,the coil reactance height,the coil end insulation distance and the coil distance yoke distance were carried out by using secondary development program of the Mag Net software.The simulation results showed that the yoke sectional area,the coil reactance,the height and the insulation distance of the coil end are sensitive to the influence of the falling rate of the saturation inductor,and the distance from the coil to the side yoke is not sensitive to the influence of the falling rate of the saturation inductor.The results also demonstrated that lowering the working inductance can effectively reduce the reduction of the saturation inductance and improve the inductance.Then,through the experimental research of two high-impedance transformers' series reactors,the accuracy of the research of the numerical simulation method on the saturation characteristics of the bridge arm reactor were verified.It was also proved that the saturation of the magnetic shielding type air core reactor proposed in this paper has good linearity by the parameter optimization method.Finally,based on the technical parameters of the 75 m H bridge arm reactor of the Zhangbei Soft Project,the scheme calculation and the structural design of the oil-immersed bridge arm reactor were carried out.The professional simulation software was used to verify the wave process,electromagnetic field,temperature field and mechanical problems of the reactor,and the reliability of the design scheme was also verified.By which means,this paper has achieved the new products' development of oil-immersed bridge arm reactors with more mature oil-paper insulation system,stronger overload capacity,low center of gravity and high shock resistance.