普通变压器和自耦变压器空载投入时对电网冲击影响的比较研究

Comparative Research on Impacts from Ordinary Transformers and Autotransformers on Power Networks in No-load Operation

针对普通变压器和自耦变压器空载投入电网时冲击影响差异性展开研究,侧重从电网侧分析2种变压器空载投入时冲击影响的差异。在考虑变压器空载投入时铁心的饱和特性基础上,建立了变压器空载投入时对电网冲击影响的数学模型,运用数值仿真直观比较了2种相同规格、不同类型变压器空载投入时对电网的冲击影响,得出冲击影响相似性的一般性结论。接着针对所给出的模型,通过暂态仿真验证了所给出的相似性结论,同时也验证了模型的正确性。

The paper studies on differences of impacts of ordinary transformers and autotransformers in no-load operation and lays particular attention to differences of both impacts of the two transformers in terms of power networks.On the basis of considering saturation characteristics of the iron core in the condition of no-load operation of transformers,the paper builds mathematical model of impacts on power networks in no-load operation;by using numerical simulation,the paper compares impacts of the two transformers,which own same specification but different types on power networks in no-load operation,and it draws a general conclusion on similarities of the impacts.Besides,the paper verifies the concluded similarities in accordance with the given model;it also verifies the correctness of the model.