某750 kV 主变压器中性点电抗器配置及过电压绝缘配合研究

摘要

In order to limit the single -phase or two-phase short-circuit current level of 750 kV Northern Urumqi Substation and guarantee the safe and stable operation of power grid , the overvoltage and insulation coordination is studied by installing reactor in main transformers of Northern Urumqi Substation .Through the research , the power frequency and operating overvolt-age level in neutral point of 750 kV main transformers are put forward .By steady state and transient power frequency current of neutral point reactor in main transformer , it achieves the purposes of optimizing the structure of power grid and improving the level of safe and stable operation .%为了限制750 kV乌北变电站单相或两相短路电流水平，保证电网安全稳定运行，对乌北变电站加装电抗器进行过电压及绝缘配合研究。通过研究，提出了750 kV中性点的工频及操作过电压水平；通过中性点电抗器的工频稳态及暂态电流，达到了优化电网结构，提高安全稳定运行的目的。