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The natural contamination components vary in different areas. NaCl is the major soluble salt on the surface of insulators in coastal areas. In contrast, the proportion of CaSO4 in inland areas is greater, which makes pollution flashover voltage of insulators have large scatter. As a result, the relationship between ESDD and pollution flashover voltage is unclear. However, in the artificial contamination...
The equivalent salt deposit density (ESDD) is one of the appropriate parameters to describe the level of contamination on the surface of insulator. Because of the unique properties of silicone rubber, some contamination on the surface of silicone rubber is difficult to be dissolved, which is not related to the pollution flashover. This paper proposes the equivalent dissolved salt deposit density (EDSDD)...
RTV (Room Temperature Vulcanizing silicone rubber) is widely applied in power grids in China to prevent serious pollution flashover accident on the porcelain and glass insulators. The aging of RTV coating inclines to decrease anti-pollution flashover performance of the coating insulators, so the RTV coating need to be repaired after a period of operation time. The mechanical properties of RTV (such...
Closely related to the flashover performance of insulators, the conductivity of partial surface is a new parameter to present the contamination without damaging the contamination on the surface of the insulators. This paper introduces a special probe, which is newly designed for measuring the conductivity of partial surface. Using this probe, we studied the effect of soluble salt component on the...
At the Kunming Natural Contamination Testing Station we chose the common Porcelain insulator, Glass insulator and Composite insulator to study the natural characteristics of insulators contamination hang by the way of I-string and V-string under two conditions of on-load DC power and AC power. We not only chose the regular Scrubbing method to measure the ESDD and NSDD, we also chose the new method...
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