应用CDEGS进行杆塔接地体降阻方案设计的研究

Resistance Reduction Scheme Design of Tower Grounding Body by CDEGS

为了提高输电线路的耐雷水平以及线路发生短路故障时故障电流能够通过接地体快速散流,以保障电力系统能够安全、稳定运行,本研究从实际运行的线路杆塔接地体入手,对其开展降阻优化工作,首先进行原有杆塔接地体的现场勘查,包括原有接地体工频接地电阻值和土壤电阻率分层的测量,其次在CDEGS中建立原有杆塔接地体的模型,验证仿真计算应用于接地体设计的可行性,最后在CDEGS中进行接地体的优化结构设计,包括增加射线和垂直接地极两种形式,计算结果证明在原有接地体周围增加射线可以起到较好的降阻作用,降阻前和降阻后的接地体电阻分别为21.99Ω和13.98Ω,研究的方式和结果可以为此类接地体降阻优化方案的设计提供参考思路和模式,有助于相关设计人员开展设计工作。

In order to improve the lightning withstand level of transmission lines and ensure the safe and stable operation of the power system,the author starts from the actual operation of the line tower grounding body,and carries out the resistance reduction optimization work.Firstly,the field survey of the original tower grounding body is carried out,including the power frequency grounding resistance of the original grounding body and the layered soil resistivity.Secondly,the model of original tower grounding body is established in CDEGS to verify the feasibility of applying simulation calculation to grounding body design.Finally,the optimal structure design of grounding body is carried out in CDEGS,including adding ray and vertical grounding electrode.The calculation results show that adding ray around the original grounding body can play a better role in reducing resistance.The resistance of grounding body before and after resistance reduction is 21.99Ωand 13.98Ω,respectively.The research methods and results can provide reference ideas and modes for the design of resistance reduction optimization scheme of such grounding body,and help relevant designers to carry out design work.