The former's major design basis is the parameter of soil resistivity along the pipeline, the crossings of high-voltage DCtransmissionline with the pipeline etc.
前者的设计依据是沿线土壤的电阻率及输电线路与管道交叉等参数，后者主要是加压站内深井阳极地床。
2
In DCtransmissionline construction design, current national standard of economical current density will under predictcd conductor section, resulting in large loss.
Therefore, it has great significance to research DC icing test methods on disk-shaped suspension insulator for study of DCtransmissionline characteristics of external insulation.