摘要
接地系统是电缆输电系统安全运行的重要设施之一。以220 k V送电工程为例,通过解析计算方法求解该工程中人工接地系统接地电阻,采用有限元方法分析简化该工程中盾构接地系统并通过简化公式计算其接地电阻,对比计算结果表明盾构接地系统更适于作为电缆隧道的接地系统;根据等效的盾构接地系统模型计算地电位特性表明:在地表面上,地电位沿电缆隧道垂直方向逐渐减小,沿电缆隧道平行方向逐渐增大并趋于稳定;跨步电压在电缆隧道垂直方向上出现最大值,但远小于跨步电压的安全限值。
The grounding system is one of the important facilities for the safe operation of the transmission of the cable. The grounding resistance of artificial grounding system in 220 kV power transmission engineering is evaluated using analytic method. The grounding system using the tunnel foundation （GSTF） in the same engineering is analyzed by the finite element method and the corresponding grounding resistance is solved using the simplified formula. The comparison among results indicates that the GSTF can be a very competitive candidate as the grounding system of cable tunnel; In addition, the grounding potential character is studied using the simplified model of GSTF. The grounding potential gradually reduces along perpendicular to the cable tunnel and increases to stable along the parallel to the cable tunnel. The maximum value of the step voltage is in the perpendicular direction to the cable tunnel and far less than the safety limit.
出处
《电网技术》
EI
CSCD
北大核心
2015年第6期1568-1572,共5页
Power System Technology
关键词
电缆隧道
接地系统
接地电阻
cable tunnel
grounding system
groundingresistance
