牵引变压器合闸振荡过电压研究

RESEARCH ON THE OSCILLATING OVERVOLTAGE CAUSED BY TRAILING TRANSFORMER'S COMMISSIONING

为研究变压器合闸过电压的机理测试了 2 2 0kV牵引变电站主变空载合闸过程 ,波形及数据的综合分析显示系统过电压为高频振荡。ATP EMTP模型的仿真结果表明 ,合闸相角、系统阻抗、线路阻抗及线路电容对系统振荡程度及牵引变励磁涌流都有影响 ;改变系统参数对系统过电压、涌流的影响趋势相似 ,只是具体程度不同。在所研究的几个特定变电站系统环境下 ,此种振荡过电压均≯ 2 .0p .u .。

Overvoltage appeared during the commissioning of several trailing transformers in Jilin Province. Analysis showed that the electromagnetic oscillating of the system caused the overvoltage of the feeding phases. After setting up an accurate stimulating model used in ATP-EMTP, the adverse influence on the electric power sysem and the character of the oscillation overvoltage had been studied. Results showed that under the environment of these substations the amplitude of the overvoltage couldn't exceed 2.0 p.u. and would have little influence on electric power system.