CAJ | 학술논문

发电厂主变压器大接地系统高压侧发生接地故障时，故障点零序电压会经主变压器高低压绕组间耦合电容传递到发电机侧，因此在整定发电机基波零序电压定子接地保护定值时需校验该传递电压的影响。结合锦屏二级水电站的运行参数，阐述了主变压器高压侧接地故障传递电压的计算方法，校核了发电机基波零序电压定子接地保护定值的正确性。
발전엄주변압기대접지계통고압측발생접지고장시，고장점령서전압회경주변압기고저압요조간우합전용전체도발전궤측，인차재정정발전궤기파령서전압정자접지보호정치시수교험해전체전압적영향。결합금병이급수전참적운행삼수，천술료주변압기고압측접지고장전체전압적계산방법，교핵료발전궤기파령서전압정자접지보호정치적정학성。
When the grounded system for high voltage system gets out of order , the zero-sequence voltage of fault point is transferred to the generator by the coupling capacitance of step -up transformer .So the influence of transfer voltage should be considered in calculation setting of relay protection .According to the operational parameters of Jinping Hydropower Station , the calculation methods for the transfer voltage of ground fault in step -up side of main transformer are introduced , and the correctness of set points of stator grounding protection of zero -sequence voltage is checked .