Abstract
A parametric study is carried out on cleaning of standard-type high-voltage outdoor insulators by air-particle spray. Statistical analysis of the resulting insulator conductivities shows that corn cob particles are more effective than walnut shell particles in agreement with the basic principles of air-particle flow. Specifically, the smaller size and the flatter and bulkier shape of the corn cob particles enhance aerodynamic drag and give rise to higher particle spray velocities. More contaminants are removed from insulator surface because of the resulting higher particle kinetic energy. Nozzle size and orientation also significantly reduce the insulator conductivity through optimum combination of particle mass flow rate and particle velocity and through particle ricochet effect.
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