Research purposes: Calcium sulfate and other slightly soluble salts in the natural pollution of catenary insulators could result in differences in flashover voltages between artificially and naturally polluted insulators at the same salt deposition density, which will make the operation and maintenance department unable to accurately obtain the actual pollution degree of the insulator. In this paper, the catenary insulator in the saline-alkali area is taken as the research object. The solubility model of CaSO4 in the mixed salt solution is established through thermodynamics and Pitzer electrolyte solution theory. The calculated formulas of equivalent salt deposition density, non-soluble deposit density deposition density and flashover voltage of the insulator were modified by using the obtained CaSO4 solubility model, and the results from the correction formula are compared with the experimental data from the artificial pollution test of the XP-160 insulator.
Research conclusions: (1) Salt-alkali areas are more prone to flashover than other areas; (2) The remaining polluted components can change the conductivity of the polluted solution by inhibiting or promoting the dissolution of CaSO4, and its influence on the flashover voltage should not be ignored; (3) The error between the corrected data of the formula and the test data is within 6%; (4) The research results can provide a reference for the flashover voltage correction of insulators under mixed pollution components and the operation and maintenance of insulators in saline-alkali areas.
Key words
catenary insulator /
the composition of pollutants /
flashover voltage /
CaSO4 /
corrected formula
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References
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