Experimental study on the contamination deposition characteristics of insulators in a fog–haze environment

Analysis of training techniques of ANN for classification of insulators in electrical power systems

“…The method proposed by Powell based in Beale restarts the training if there is very little orthogonality left between the current gradient and the previous gradient. If this condition is satisfied, the direction of the search will be redefined by (2).…”

“…When the insulator's surface becomes contaminated, its insulation capacity is compromised, making the system more vulnerable to electrical discharges and leakage currents. Generally, when the relative air humidity is high or when it is raining, electric discharges may occur on insulators partially damaged or contaminated, due to increased surface conductivity [2].…”

Simulation on Deposition Characteristics of Contamination Particles in Fog-Haze Environment

“…In general, the high incidence period of fog-haze weather is mainly in autumn and winter, especially in cold winter, so the fog in fog-haze weather mentioned in this paper refers to cold fog. The fog-haze weather can aggravate the deposition of contamination particles on the surface of insulator, and then incur pollution flashover [4]- [6]. Therefore, it is of great significance to research the deposition characteristics of contamination particle on the insulator surface in fog-haze environment.…”

“…However, there are few researches on the contamination particles deposition characteristics on the surface of insulator under fog-haze weather. The literature [3], [4], [19] demonstrated that wet deposition caused by gravity in fog-haze environment significantly aggravates the contamination deposition on the insulator surface. But the high concentration of PM2.5 has a very extremely limited contribution to the increase of particle deposit amount.…”

Studies on metallurgical contamination accumulation characteristics on ceramic insulator of 500 kV AC transmission line

“…Many scholars in China have conducted extensive research on contamination accumulation characteristics of insulators in different areas from the aspects of contamination degree and contaminant components [10][11][12][13][14][15][16][17][18][19]. The 70-80% of the soluble salt in the outer insulation contamination of the inland areas of northern China is low solubility calcium sulphate, and its test SDD is less than the measured SDD.…”