中文摘要：

就小电阻法、电容隔直法、电位补偿法3种抑制方法比较而言,在均需要旁路保护以及对旁路保护的技术条件、安全可靠性要求一样时,使用电容器来抑制直流偏磁电流具有较多的优势。为开发应用该技术,分析了220kV交流系统短路故障时变压器中性线的最大暂态电流,通过减小工频阻抗参数,研发出阻容抑直装置。与典型的电容隔直装置相比,完全可以不采用电力电子开关旁路保护系统,提供了一种更加简单、经济、安全、高效的直流偏磁电流抑制方案。

英文摘要：

Three means for blocking or mitigating the DC current in transformer neutral, including small-resistance, capacitor and potential compensation, were compared. The capacitor DC current blocking device （DCBD-C） was of more advantage in uttilization under the same technical ＆ reliability condition for the BYPASS. The studies on the maximum current in transformer neutral were covered when there is a fault in 220 kV AC system. By decreasing the impedance of the apparatus, a capacitor-resistor DCBD （DCBD-RC） was developed and put into service. Comparing with typical DCBD-C, there is no need using the electronic bypass. The DCBD-RC presents a new means for blocking DC current in transformer neutral in a more simple, more economic, safer and more efficient way.