不同因素对特高压变压器励磁涌流的影响

Analysis of effects on inrush current in UHV transformer induced by different factors

为了研究特高压变压器产生的励磁涌流对特高压变压器差动保护的影响,运用MATLAB/SIMULINK,建立了特高压变压器仿真模型,参数按照晋东南—南阳—荆门1000kV特高压交流试验示范工程中的相关数据设置。利用所建立的模型进行空载投切的仿真,分析了合闸角与剩磁对励磁涌流的影响。仿真结果验证了控制合理的合闸角与剩磁可以限制励磁涌流的出现,从而避免特高压变压器差动保护误动,为提出新的识别励磁涌流判据提供了理论基础。

In order to explore the excitation of inrush current in ultra-high voltage （UHV） transformer and its influ- ence on differential protection, based on MATLAB/SIMULINK platform, a simulation model on UHV transformer was established, the parameters of which were set according to the data of the Southeast Shanxi - Nanyang - Jingmen 1000 kv UHV ac testing project. Simulations were conducted to analyze the switching angle and the residual mag- netism upon the influence of excitation inrush current. Simulation results showed that the reasonable control of switc- hing angle and residual magnetism can limit the emergence of excitation inrush current, thus avoid uhv transformer differential protection from misoperating. It provides a theoretical basis for putting forward a new recognition of exci- tation inrush current criterion .