In order to better understand the probability distribution of space around the each lightning point and influences of ground wires protection angular of the 500 kV transmission line on the shielding performance, using the 500 kV typical transmission lines as examples, we established a model of reducing transmission line tower to simulate the shielding failure. The experimental results verify the superiority of the negative protection angle in the antishielding performance, and reveal that, the closer the transmission lines are, the more the strike is; from the central tower head to file, the probability of shielding failure increases first, then decreases. The research results provide a scientific basis for the design of lightning protection of 500 kV transmission lines.

According to the distribution of dirty area in power system,the influence of coating thickness and density of salt and dust on migration of hydrophobicity coating is analyzed by measuring the static contact angle and using HC water spray classification method.The results show that coating thickness and density of salt have little effect on migration of hydrophobicity for PRTV coating while the density of dust have large effect;the lager the density of dust is,the more difficulty the PRTV coating moves.The study results provide an important guiding meaning for the coating operation in dirty area and a basis theory for investigating the influence of density of salt and dust on electricity property of anti-flashover coating.

通过对葛南直流输电系统(葛洲坝侧)输送额定容量情况下接地极各种参数的测量,考核接地极的运行状况,并对葛洲坝侧接地极的电气和安全性能进行了评估.

导体消雷器运行状况的调查表明:经过1238套.a的运行考验,伞型导体消雷器本体及其被保护物未遭受直击雷;经过3200套.a的运行考验,线路型导体消雷器仅有11基.次雷击跳闸事故.分析比较了导体消雷器与避雷针的防雷效果,导体消雷器明显优于避雷针.