中性点小电抗接地对故障电流的影响  

Effect of Neutral Small Reactance Grounding on Fault Current

作　　者：姚富民 YAO Fumin(Gansu Jiu Steel Group Hongxing Iron&Steel Co.,ltd.,Jiayuguan 735100,Gansu,China)

机构地区：[1]甘肃酒钢集团宏兴钢铁股份有限公司,甘肃嘉峪关735100

出　　处：《电气传动自动化》2024年第1期61-63,共3页Electric Drive Automation

摘　　要：提高变压器短路阻抗的方法有很多种,在自耦变压器中,中性点经小电抗接地是一种比较有效的方法。文中对故障电流抑制作用进行了分析。在自耦变压器的零序电路基础上,理论分析了中性点小电抗接地对高中压等值电抗的影响。文中举例计算了短路电流,数据验证分析了接地电抗对短路电流的影响。There are many ways to improve the short-circuit impedance of transformers.In the Auto-transformer,grounding the neutral point by small reactance is an effective method.In this paper,the restraining effect of fault current is analyzed.Based on the zero sequence circuit of the Auto-transformer,the influence of grounding of the small neutral reactance on the high-medium voltage equivalent reactance is analyzed theoretically.In this paper,the short-circuit current is calculated with an example,and the influence of grounding reactance on the short-circuit current is verified and analyzed.

关 键 词：自耦变压器 电抗 接地 故障 短路电流 

分 类 号：TM411.3[电气工程—电器]