摘要
利用国际著名的电力系统接地分析软件(CDEGS)来仿真计算雷击输电线路杆塔时邻近管道上出现的过电压,探求土壤电阻率、接近距离、绝缘相对介电常数等参数对绝缘层耐压的影响。对比了几种管道接地方式对绝缘耐压的影响,并求出了雷电流幅值为100 kA的极端情况下,保证管道绝缘安全所能允许的最小接近距离。通过仿真分析得出:土壤电阻率越大,接近距离越小,绝缘材料的相对介电常数越小,绝缘所受的威胁就越大。
The famous international software CDEGS is used to simulate and calculate the overvoltage occurred in the oil pipeline when lightning strokes on the tower of the transmission line which is close to the pipeline. Many factors are studied to seek for their effects on the potential difference of the insulation layer, such as soil resistivity, the distance between the oil pipeline and the tower, relative dielectric constant, and so on. The influence of the grounding mode of the pipeline are get, and also the minimum distance is obtained in the extreme case that amplitude of the lighting current is up to 100 kA. From the simulation results, conclusions can be get as follows： .the threat of insulation layer will be great if the soil resistivity is high, the distance is low and the relative dielectric constant of the insulation material is small.
出处
《陕西电力》
2008年第9期41-45,共5页
Shanxi Electric Power
