特高压直流入地电流对附近杆塔地网腐蚀评估  

Corrosion Effects and Evaluation Method of UHV Power Line Tower Grounding Collection Caused by DC Current

作　　者：董晓辉[1] 杨威[1,2] 唐程[1] 刘刚[1] 

机构地区：[1]国网电力科学研究院,武汉430074 [2]武汉大学电气工程学院,武汉430072

出　　处：《高电压技术》2009年第7期1546-1552,共7页High Voltage Engineering

摘　　要：为了有效开展直流入地电流对交流电网的影响评估,指导特高压直流接地极工程的选址建设,以国家电网公司正在建设的±800kV某特高压直流输电工程接地极(址)及邻近500kV交流输电线路杆塔实际参数为例,采用接地仿真计算软件建立了相应的极址土壤模型和线路电气模型,对流入输电线路各杆塔接地体的直流电流及分布特性进行了全面、系统的研究,根据接地极在设计寿命内的总安时数和运行方式计算得到了单基杆塔接地体的腐蚀量,分析表明杆塔地网腐蚀量与接地极运行的安时数、流出该基杆塔接地体的电流值以及使该基杆塔接地体电流流出时接地极的运行时间成正比,且主要集中在接地体的末端,建议应根据极址土壤电阻率参数和系统额定电流来确定接地极与输电线路的最小距离要求。该成果可用于指导直流接地极设计中类似问题的研究。Taking actual parameters of a grounding electrode and nearby transmission line tower of an 800 kV Ultra hvdc transmission project under construction as example, the electrical model of the DC grounding electrode, transmission line, ground wire and tower grounding body and corresponding soil model are built in this paper. The DC current flowing in transmission line tower grounding body and its distribution character are fully and systematically researched by solving the Maxwell equations directly. According to the total amphere hours and operation mode of grounding electrode in designed life, the corrosion quantity of single base tower grounding body is obtained. The research results can be applied in DC grounding electrode design and similar problems.

关 键 词：特高压 直流接地极 人地电流 输电线路杆塔 接地体 腐蚀 

分 类 号：TM862[电气工程—高电压与绝缘技术]