变电站接地极电阻建模计算及特征分析.pdf

2017年1月1日
现代电子技术
Jan.2017
第40卷第1期
Modern Electronics Technique
Vol 40 No. 1
doi:10.166525issn.1004-373x.2017.01.040
变电站接地极电阻建模计算及特征分析
齐晓朋,马俊贵2
(1.菜州市气象局,山东烟台2614(0;2.宁夏石嘴山气象局,宁复石I山753000
摘要:在变电站中,为有效预防发生交电站接地故障,利用 PSCAD软件搭建某交电站35kV电网的电血仿真模型,通过
建模计算变电站接地极的电阻大小,并分析其特征,改善变包站接地极电阻设置方案以确保规邂变电站接地风险。结果表明
在变电站中,中性点经电阻接地更适用于変电站中性点电阻接地方式,在变电站中,经建模计算其接地电阻理论值是1.28Q,
但在实际中为提升变电站建设的经济性,降低遊价成本,可以将电阻设计值定为0.687Q,同时可以为变电站设置高阻地面以
满足实际中变电站安全运行的要求,不仅有利于变站安全、稳定的运行,也可使変电站运行的安全性提升42.0%。结论证实
通过建模计算变电站接地极电阻,并分祈接地极电阻的特征,有助于设计优化方案,澦防变电站接地发生,产生积极影响。
关键词:变电站接地;特征分析;建计算:接地极电
中图分类号:TN710-34
文献标识码:A
文章编号:1004-373X(2017)01-0149-03
Modeling calculation of substation grounding resistance and its feature analysis
Xiaopeng, MA Jungui'
1. I ihou Melemrlogical Rur u, Y a 261400, hina: 2. Shisa M l Bur Shiuish. hina
Abstract: In order to prevent the substation grounding fault, the PSCAD software is used Lo establish the resistance simula
tion model of a certain substation 35 kv power grid. The grounding electrode resistance is obtained by means of the modeling cal
culation, and its features are analyzed. The selling seheme of the substation grounding resistance was improved to avoid the su-
tation grounding risk. The results show that the neutral point grounding through the resistance is suitable for the neutral point re
sistance grounding mode in substation The theoretical value of the substation grounding resistance obtained by modeing caca
tion is 1. 281, and the resistance design value is 0.687 2 to improve the substation safety operation and reduce the cost. The high
resistance ground ean be set for the substation to satisfy the requirement of practieal substation safety operation, facilitate the sub
slation safe and stable runnin and he subs alion running afely is inereased y 42. The conelusion verifies that the modelin
calculation of the substation grounding electrode resistance and the analysis of the grounding electrode resistance features are con
ducive to the design of the optimization scheme and prevention of the substation grounding situation, and have a positive impact
Keywords: substation grounding; feature analvsis; modeling calculation; grounding electrode resistance
针对变电站接地极电阻建模及特征分析的相关问面积因素,使得变电站的面积人为缩减,这样会导致接
题,基于 PSCAD软件,建模计算变电站接地极电阻
地网不能向四周进行伸展,从而在接地极电阻设置中也
小,并分析接地极电阻特征,优化计算变电站接地电阻将面临挑战2。另外,若是要将变电站建立在多山的区
值,确保变电站可以正常运行。
或,或是在丘陵地带中,由于当地土裏的电阻率比较大,
对变电站接地极电阻进行建模分析的意义
岩是按常规的接地电阻设计,则不能达到变电网运行中
对接地电阻的要求。为此,以有强化变电站接地极电
目前变电站的接地工程中,如何将接地电阻降至安
全限值以下依然是主要的技术难题之一。近年来人们
阻建模及特征分析工作,通过对变电站现场实验测量与
开始采用接地模块作为接地体解決接地降阻难题,但仿真模型计算,对变电站接地极电阻进行建模计算?,设
对于变电站中出丁接地极模块方面,还缺乏科学的依置出合理的变电站接地极电阻值,发挥积极的实用意义。
据,在构建中存在育目性,无形中提升了变电站接地的2变电站项目概况
风险。并且,若是在城市城区内建设变电站,由于用地
2.1基本资料
收稿日期:2016-05-10
?于本次研究中,选择的变电站位于某山区境内
万数据