变电站10 kV进线保护段研究

为降低变压器遭受变电站中、低压侧出线近区大短路电流冲击的概率，文章提出了10 kV进线保护段的构想，给出了进线保护段的构成；对10 kV进线在不同布置、不同导线截面下短路电流的沿线分布进行了仿真计算，以确定进线保护段长度；计算分析了采用10 kV进线保护段对变电站雷电侵入波过电压的影响，结果表明装设进线保护段前后变压器的雷电过电压水平无明显变化。

Study on 10 kV Lead-in Line Protection Section in Substations

To reduce the surge probability of transformer windings incurred by heavy short-circuit current occurred in the near zones of medium-and low-voltage feeding lines,the authors propose the conception of 10 kV lead-in line protection section and give its construction.The distribution of short- circuit current along the lines under typical line configurations and various conductor cross-sections are simulated to determine the length of lead-in line protection section;the influence of adopting 10 kV lead-in line protection section on lightning intruded-wave over-voltage is calculated and analyzed,results show that there is no evident change of lightning over-voltage of transformers before and after the lead-in line protection sections are equipped.