摘要
直流输电系统处于单极大地回线运行方式时,直流接地极入地电流会导致管道上产生感应电位,在管道的破损点会有电流流进、流出,从而加速管道的腐蚀。从耦合途径、敏感设备两个角度,研究了抑制直流接地极入地电流对埋地金属管道影响的措施。分析了直流接地极与埋地金属管道防护距离对管道干扰电压的影响,研究表明当直流接地极与埋地金属管道防护距离大于一定值时,直流接地极入地电流对管道的影响很小,可以不考虑其影响。着重研究了土壤电阻率对防护距离的影响,发现防护距离受土壤电阻率的影响很大,在一定范围内,防护距离随土壤电阻率增大而增大。对分段绝缘法、旁路排流法、强制阴极电流法三种金属管道自身抑制直流接地极干扰的措施进行了总结。
Under mono-pole ground return operation mode of HVDC systems,the enormous ground return current leads to induction potential on the metallic pipeline,and the current flowing into and out of dilapidating point of the pipeline accelerates the corrosion of pipeline. In this article,repressive measures of the influence of the enormous ground return current on the metallic pipeline are studied from two perspectives of the coupling path and sensitive device. The influence of the shielding distance between the DC transmission earthing electrode and the pipeline on induction potential of the pipeline is analyzed. When the shielding distance is greater than a certain value,the influence of the enormous ground return current on the pipeline can be neglected. The effect of the soil resistivity on the shielding distance is emphatically studied. The soil resistivity is found to have a great influence on the shielding distance and the shielding distance increases with the soil resistivity within certain limits. Repressive measures of electromagnetic interference on the pipeline are summarized,including sectional insulation pipeline,bypass discharge,and impressed current cathodic protection.
出处
《南方电网技术》
北大核心
2015年第2期62-67,共6页
Southern Power System Technology
关键词
直流接地极
金属管道
土壤电阻率
防护距离
抑制措施
HVDC electrode
metallic pipeline
soil resistivity
shielding distance
repressive measure
作者简介
孟晓波（1986），男，工程师，博士，从事输电线路外绝缘和直流工程接地极的研究工作，mengxiaobo2008@sina．com；
廖永力（1984），男，工程师，硕士，从事高压输电线路外绝缘和防雷的研究工作；
李锐海（1964-），男，高级工程师（教授级），学士，从事高电压技术研究和管理工作，lirh@csg．cn。
