徐志,李胜男,于辉.变压器中性点串接电容抑制偏磁措施及其引起的过电压分析[J].电测与仪表,2014,51(14):. XU Zhi,LI Shengnan,YU Hui.Applying series capacitor to restrain power transformer DC biasing and Overvoltage it caused[J].Electrical Measurement & Instrumentation,2014,51(14):.
变压器中性点串接电容抑制偏磁措施及其引起的过电压分析
Applying series capacitor to restrain power transformer DC biasing and Overvoltage it caused
Series capacitor has become an effective way of governance DC Bias, this paper elaborates the theoretical and simulation analysis of its principles and system over-voltage it caused. In the paper, firstly, it made ??a simple analysis of the principle of DC Biasing; then established the appropriate model with a typical substation in Yunnan Power Grid, the simulation analysis and actual measurement data comparison proved that the model accurately and efficiently; and then simulation of DC distribution of related substation was done, followed by series different capacitor in the neutral point ,it provided a theoretical basis for the capacitor in series with the selection; at last, the overvoltage, especially neutral overvoltage was made in detail, the results show that, series capacitor method may affect transformer neutral point over-voltage to a certain extent. Therefore, to selecting an appropriate capacitor, you need to consider the inhibitory effect of the neutral point of over-voltage and bias DC.
