CAJ | 학술논문

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.
취소전조법、전용격직법、전위보상법3충억제방법비교이언,재균수요방로보호이급대방로보호적기술조건、안전가고성요구일양시,사용전용기래억제직류편자전류구유교다적우세.위개발응용해기술,분석료220kV교류계통단로고장시변압기중성선적최대잠태전류,통과감소공빈조항삼수,연발출조용억직장치.여전형적전용격직장치상비,완전가이불채용전력전자개관방로보호계통,제공료일충경가간단、경제、안전、고효적직류편자전류억제방안.
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 uhilization 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.