摘要
110kV～500kV系统常采用有效接地系统,110kV及220kV系统中变压器中性点直接接地或经低阻抗接地,部分变压器中性点也可不接地;330kV及500kV系统中不允许变压器中性点不接地运行。文章对有效接地和低电阻接地系统中的变电所接地要求加以梳理,并结合工程实例对变电所的接地设计进行了分析探讨,结合国家电网公司"两型一化"变电站设计建设导则,提炼出变电所接地设计的主要考虑思路及解决方案。
The effective earthing system has been popularly used in 110kV～500kV system,the neutral-point direct earthing or low-resistance earthing has been used for 110kV and 220kV transformers while no earthing for some of transformers is also available;the neutral-point no-earthing operation is not permitted for 330kV and 500kV transformers.This article try to clarify the related requirements for the substation earthing in effective erarthing and low-resistance earthing system by incorporating some exact project cases and the so-called ＂Two types and one mode＂ design guide for substation stipulated by State Grid,and figure out some thinking and solution methods.
出处
《电力勘测设计》
2010年第6期68-71,共4页
Electric Power Survey & Design
关键词
有效接地
直接接地
低阻抗接地
两型一化
二次系统
effective earthing
direct earthing
low-resistance earthing
peak value
sub-corner mesh potential
two types and one mode
current branching
secondary system.
