摘要
针对目前广东电网500 kV变电站220 kV母线单相短路电流急剧增大,甚至超过三相短路电流的现象,分析其产生的原因,提出了2种抑制单相短路电流的可行性方案:主变中性点经小电抗接地和220 kV母线分裂运行同时加装备自投装置。以广东电网500 kV变电站为例,经计算分析,这2种措施对单相短路电流都起到了良好的抑制作用。
In the light of the phenomenon that 220 kV bus single-phase short-circuit cun＇ent of Guangdong power grid 500 kV substation increases greatly and even exceeds three-phase short-circuit current at present, this paper analyzes the reason of this phenomenon, and proposes two measures to restrict the single-phase short-circuit current. One measure is main transformer neutral point grounding through small reactance and the other measure is that 220 kV split bus arrangement with backup automatic switch. Taking the 500 kV substation of Guangdong power grid as an example, the calculation and analysis results show that the two measures have a good inhibitory effect on the single-phase short-circuit current.
出处
《陕西电力》
2013年第10期91-94,共4页
Shanxi Electric Power
关键词
单相短路电流
小电抗
中性点接地
分裂运行
各自投装置
single-phase short-circuit current
small reactance
neutral grounding
split arrangement
backup automatic switch
