Abstract
In order to understand the force and motion characteristics of contamination particles under the influence of electric force and airflow drag force nearby the high voltage direct current (HVDC) insulator, the simplified model of high voltage end of ±800kV composite insulator which has more serious pollution was established. By the finite element method, the electric field as with similar distribution nearby the practical HVDC insulator high voltage end was built, the steady turbulent fluid field was simulated. The gravity, electric force and air drag force were loaded on the uniformly charged contaminant particles. The characteristics of electric force and air drag force on the particles, the relationship between quantity of electric charge on particles and probability of particles contacting with insulator surface were analyzed. It is found that airflow drag force on particle is significantly greater than electric force with normally charging. As the electric charge multiplying, the electric force increases linearly, and the airflow drag force grows slower than it. As increasing electric charge on particles, the probability of particles contacting with insulator surface is increased. However, the contact probability decreases with the increase of the charge after having a certain quantity as the magnitude of electric force and drag force is going to similar.
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