偏磁式消弧线圈在小容量发电机中性点的应用  

Application of arc suppression coil with magnetic bias in small-capacity generator neutral point

作　　者：王大勇 

机构地区：[1]中国水利水电第三工程局有限公司制造安装分局,陕西西安710032

出　　处：《水电站机电技术》2016年第B11期16-18,共3页Mechanical & Electrical Technique of Hydropower Station

摘　　要：目前国内单机容量10—100MW，机端出口电压10．5kv，定子基波接地保护投告警，中性点普遍采用常规消弧线圈补偿。本文针对上述机组没有甩负荷、机组频率在额定50Hz、机组暂态或者动态过电压不会超过2．6倍相电压这一点至关重要的试验结论，阐述常规消弧线圈对比偏磁式消弧线圈的优缺点，展望偏磁式消弧线圈应用于小容量机组中性点的前景。At present,in case of an alarm in enabling of fundamental wave grounding protection of stator at a unit capacity of10-100 MW and an outlet voltage at generator terminal of 10.5 kV,the neutral point is generally compensated by conventional arc suppression coil in China.Based on the crucial test conclusion that the transient or dynamic overvoltage of unit will not exceed 2.6times of the phase voltage at the rated frequency of unit being 50 Hz without load rejection of unit,this paper discuses advantages and disadvantages of arc suppression coil with magnetic bias compared to conventional arc suppression coil,as well as application prospect of arc suppression coil with magnetic bias in small-capacity unit neutral point.

关 键 词：定子接地 偏磁式消弧线圈 暂态过电压 串联谐振 

分 类 号：TM475[电气工程—电器]