非均匀土壤矩形接地网优化设计
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摘要
当接地网周围土壤环境一定,使用最优的均压带布置方案可以有效均匀接地网地表表面的电位,进而降低接触电压和跨步电压,并且尽可能的节约材料,降低建设成本。为了得到适用于非均匀土壤环境下,矩形的接地网最优布置方案,基于CDEGS建模,首先移动各个均压带,得到优化后均压带的位置,通过函数拟合得出优化函数。进一步研究了优化函数在不同的土壤反射系数、上层土壤厚度和接地网面积等因素对优化系数的影响,最后,将拟合函数应用到非均匀土壤下矩形接地网的优化中。通过和其他方法的计算对比得出,利用文中计算方法优化的接地网,最大接触电压降低12%左右。采用文中提出的方法,既适用于均匀和非均匀土壤,又可以优化矩形和方形接地网,且优化效果满足电力行业的基本标准。
When the soil environment around the grid is determined,the optimal design of grounding grid is equalized the potential,so as to reduce the touch voltage and step voltage,and as far as possible to save materials,reduce the cost of construction. In order to get the optimal layout scheme of rectangular grounding grid under the condition of non-uniform soil,based on the simulation models of square grounding grid built by CDEGS,firstly,the optimal design of grounding grid is obtained by changing each equalizing belts,and optimization function is obtained from fitting function. The change of the optimization function in different soil reflection coefficients,soil thickness and the area of the grounding grid is studied,and the effect of the rectangular grounding grid is analyzed. The research shows that the design of the grounding grid is related to the soil environment,but also with the rectangular shape. Compare with other methods,this proposed method can reduce maximum touch voltage about 12%. This method can be applied to uniform and non-uniform soil,which can optimize the rectangular and square grounding grids,and the optimization effect is in accordance with the basic standards of the power industry.
When the soil environment around the grid is determined,the optimal design of grounding grid is equalized the potential,so as to reduce the touch voltage and step voltage,and as far as possible to save materials,reduce the cost of construction. In order to get the optimal layout scheme of rectangular grounding grid under the condition of non-uniform soil,based on the simulation models of square grounding grid built by CDEGS,firstly,the optimal design of grounding grid is obtained by changing each equalizing belts,and optimization function is obtained from fitting function. The change of the optimization function in different soil reflection coefficients,soil thickness and the area of the grounding grid is studied,and the effect of the rectangular grounding grid is analyzed. The research shows that the design of the grounding grid is related to the soil environment,but also with the rectangular shape. Compare with other methods,this proposed method can reduce maximum touch voltage about 12%. This method can be applied to uniform and non-uniform soil,which can optimize the rectangular and square grounding grids,and the optimization effect is in accordance with the basic standards of the power industry.
引文
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[9]徐华,文习山,黄玲.人型变电站接地网的优化设计[J].高电压技术,2005,31(12):63-65.Xu Hua,Wen Xishan Huang Ling.Optimization design of grounding grid of large substation[J].High Voltage Engineer-ing,2005,31(12):63-65.
[10]庄池杰,曾嵘,张波,等.高上壤电阻率地区变电站接地网设计思路[J].高电压技术,2008,34(5):893-897.Zhuang Chijie,Zeng Rong,Zhang Bo,et a1.Grounding system design method in high soil resistivity regions[J].High Voltage Engineering,2008,34(5):893-897.
[2]Sverak J G.Optimized Grounding Grid Design Using Variable Spacing Techniques[J].IEEE T-PAS,1976,98(1):362-374.
[3]Dawalibi F,Mukhedkar D.Optimum design of substation grounding in a two layer earth structure,part I analyticalstudy[J].IEEE TPAS,1975,94(2):252-261.
[4]Dawalibi F,Mukhedkar D.Optimum design of substation grounding in a two layer earth structure,part II comparison between theoretical and experimental results[J].IEEE TEAS,1975,94(2):262-266.
[5]Huang L,Chen X,Yan H.Study of unequally spaced grounding grids[J].IEEE Trans on PWRD,1995,10(5):716-722.
[6]孙为民,何金良,曾嵘,等.季节因素对发变电站接地系统安全性能的影响[J].中国电机工程学报,2000,20(1):15-18.Sun Weimin,He Jinliang,Zeng Rong,et al.Influence of seasonal factor on safety of grounding system[J].Proceedings of the CSEE,2000,20(1):15-18.
[7]陈先禄,黄丽英,黄勇.用不等间距布置地网均压导体的研究[J].高电压技术1987,13(2):60-61.Chen Xianlu,Huang Liying,Huang Yong.Study for arranging voltage-sharing conductors of earthing grid with une-qual spacing[J].High Voltage Engineering,1987,13(2):60-61.
[8]何智强,文习山,张科,等.基于遗传算法的变电站接地网优化[J].电力自动化设各2008,28(6):27-31.He Zhiqiang,Wen Xishan,Zhang Ke,et al.Optimization of substation grounding grid design based on genetic algorithm[J].Electric Power Automation Equipment,2008,28(6):27-31.
[9]徐华,文习山,黄玲.人型变电站接地网的优化设计[J].高电压技术,2005,31(12):63-65.Xu Hua,Wen Xishan Huang Ling.Optimization design of grounding grid of large substation[J].High Voltage Engineer-ing,2005,31(12):63-65.
[10]庄池杰,曾嵘,张波,等.高上壤电阻率地区变电站接地网设计思路[J].高电压技术,2008,34(5):893-897.Zhuang Chijie,Zeng Rong,Zhang Bo,et a1.Grounding system design method in high soil resistivity regions[J].High Voltage Engineering,2008,34(5):893-897.