110 kV变压器中性点经小电抗接地对电流的影响  

Influence of Neutral Grounding through Small Reactance on 110 kV Transformer Current

作　　者：胡林洁 姜鹏 林俊超 马亚琦 周威 

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410004 [2]国网浙江省电力公司舟山供电公司,浙江舟山316022

出　　处：《电力与能源》2017年第6期682-687,共6页Power & Energy

摘　　要：在我国电网系统中,中性点部分接地是110 kV变压器中性点接地中应用最普遍的接地方法,但部分中性点接地方式具有一定的缺点。能有效地解决中性点部分接地缺点的方法是在变压器中性点处串联一个小电抗,既能很有效地限制单相接地故障时产生的过电流现象,又能有效地避免变压器绝缘水平过高而使成本过高,经小电抗接地对人身的安全也起了很大的保护作用。以110 kV系统为例,利用PSCAD软件仿真计算验证了该方法的准确可靠性。In China＇s power grid system, neutral partial grounding is the most common neutral grounding method for ll0kV transformer. However, partial neutral grounding has some disadvantages. The effective way to solve the disadvantages is to connect a small reactance at the neutral point of the transformer, whereby can effectively limit the overcurrent of the single-phase grounding fault, avoid the high insulation level of the transformer and the consequent high cost, and also ensures personal safety. In this paper, ll0kV system is taken as an example and PSCAD simulation software is applied to verify the accuracy and reliability of this method.

关 键 词：变压器 小电抗 短路电流 绝缘水平 PSCAD 

分 类 号：TM76[电气工程—电力系统及自动化] TM63