巨型水轮发电机中性点接地装置加电抗对中性点位移电压影响的研究  

Study of Neutral Displacement Voltage Variation Caused by the Reactor Component in Giant Hydropower Generator Neutral Grounding Equipment

作　　者：刘亚青 张丹丹[2] 朱钊 欧阳友 LIU Yaqing;ZHANG Dandan;ZHU Zhao;OUYANG You(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;Huazhong University of Science and Technology,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,武汉430010 [2]华中科技大学,武汉430010

出　　处：《大电机技术》2020年第3期47-50,共4页Large Electric Machine and Hydraulic Turbine

摘　　要：本文针对巨型水轮发电机采用高阻加电抗补偿接地方式下的中性点位移电压进行分析。通过理论分析和实测数据说明,中性点接地方式采用高阻加电抗补偿方式时,有可能放大中性点位移电压,导致发电机运行出现问题。同时分析了中性点位移电压在加电抗条件下的变化规律,提出在中性点接地装置参数配置过程中要注意分析中性点位移电压的变化。In this paper, the neutral displacement voltage of hydropower generator is analyzed when high-impedance grounding method is applied, which normally takes the form of a low-ohmic value resistor and a reactor connected to the secondary of a distribution transformer with the primary winding of the transformer connected from the generator neutral to ground. It is shown that the neutral displacement voltage may increase if such grounding method is applied,and thus the safety of generator units will be influenced. The relationship between neutral displacement voltage and the grounding impedance is revealed. It should be noted that the neutral displacement voltage should be taken into consideration when configuring the neutral grounding equipment parameters.

关 键 词：巨型水轮发电机 中性点 接地装置 位移电压 电抗 

分 类 号：TM312[电气工程—电机]