摘要
气体绝缘金属封闭输电线路(GIL)凭借着自身优势,在近年来得到很大发展。为了保证GIL使用安全,需要对其外壳接地进行合理的设计和布置。笔者介绍了GIL两种接地方式及各自特点,利用MATLAB Simulink建立三相分体式GIL等值计算模型,结合某800 kV/4 000 A GIL产品参数进行仿真计算,研究了GIL外壳电位分布特征,探究了导流排布置数量、接地点间距对外壳电位及接地点入地电流的影响。计算结果表明,GIL外壳电位呈现出端部高中间低的"V"字形分布;在GIL端部设置导流排对降低外壳电位、减小入地电流有重要作用;增加接地点数目,减小接地点间距可以降低外壳电位,减小接地点入地电流,但随着接地点数量的增加,其作用趋于饱和。因此,在实际工程中需保证在GIL端部设置导流排,结合仿真模型计算确定其他位置的导流排及接地点设置方式。
Gas insulated transmission line （GIL） has got a great development in recent years due to its advantages. In order to guarantee the safety of GIL, its enclosure grounding needs to be designed and arranged reasonably. In this paper, two grounding methods and their characteristic are introduced. An isolated phase GIL equivalent calculating model based on MATLAB Simulink is established and with the parameters of an 800 kV/4 000 A GIL the simulation was conducted, The steady enclosure potential distribution is calculated and the influence of binding bar number and position and grounding distance on enclosure potential and grounding current are studied. The results show that the enclosure potential has a ＂V＂ type distribution; binding bar added at the end of the GIL has positively important influence on reducing enclosure potential and grounding current; decreasing grounding distance will reduce the potential and grounding current, but has a trend to be saturation by increasing the number of grounding point. In result, the binding bar must be arranged at the end of GIL and the grounding points and the other binding bars should be arranged according to the calculation based on the simulation model.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第4期98-102,共5页
High Voltage Apparatus
基金
国家电网公司科技项目(SGZJ0000JJJS1500009)~~
关键词
GIL
接地
导流排
外壳电位
GIL
grounding
binding bar
enclosure potential
