文档介绍：第 35 卷第 1 期电网技术 Vol. 35 No. 1
2011 年 1 月 Power System Technology Jan. 2011
文章编号:1000-3673(2011)01-0146-06 中图分类号:TM 86 文献标志码:A 学科代码:470·4034
220 kV 变压器中性点经小电抗接地方式
于化鹏 1,陈水明 1,杨鹏程 1,印华 2,崔婷 2
((清华大学电机系),北京市海淀区 100084;
,重庆市渝北区 401123)

Neutral Grounding via Small Reactance for 220 kV Power Transformers
YU Huapeng1, CHEN Shuiming1, YANG Pengcheng1, YIN Hua2, CUI Ting2
(1. State Key Lab of Control and Simulation of Power Systems and Generation Equipments
(Dept. of Electrical Engineering, Tsinghua University), Haidian District, Beijing 100084, China;
2. Chongqing Electric Power Research Institute, Yubei District, Chongqing 401123, China)
ABSTRACT: To suppress short-circuit and meet the demand 很大,很可能误动,且可能会与避雷器绝缘配合失调。为此
of the setting of protective relaying, only part of neutral points 建立了一个重庆地区的 220 kV 电网,使用 PSCAD/EMTDC
of power transformers of 220 kV power systems in China are 软件计算了中性点加装小电抗后的中性点过电压及短路电
grounded, and this grounding mode leads to overvoltage 流。计算结果表明:中性点串接小电抗后,中性点的过电压
appeared at the neutral points of non-grounded power 会大幅下降,不再会出现失地现象,中性点电压也不会再出
transformers. In 220 kV power system adopting such a neutral 现高达相电压的过电压,中性点不必再安装间隙,只安装避
grounding mode, the neutral overvoltage may rise to phase 雷器限制雷电过电压即可,免去了绝缘配合失调的可能性;
voltage when single-phase earth fault occurs while the 并且,中性点加装小电抗后,变压器绕组流过的