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

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.