Abstract
It is important to reveal the relations of physical factors to deposition of contaminants on insulator. In this paper, the simulation model of high voltage end of insulator was established to study the force and motion characteristics of particles affected by electric force and airflow drag force near the ultra-high voltage direct current (UHVDC) insulator. By finite element method, the electric field was set specially to be similar to the one near practical insulator, the steady fluid field was simulated. The electric force and air drag force were loaded on the uniformly charged particles. The characteristics of the two forces on particles, the relationship between quantity of electric charge on particles and probability of particles contacting the insulator were analyzed. It was found that, near the sheds, airflow drag force on particles is significantly greater than electric force with less electric charge. As the charge multiplies, electric force increases linearly, airflow drag force grows more slowly. There is a trend that the magnitude of electric force and drag force is going to similar. Meanwhile, the probability of particles contacting the insulator is increased too. However, at a certain level of charge which has different value with different airflow velocity, the contact probability has extremum here. After exceeding the value, as the charge increasing, the contact probability decreases gradually.
Highlights
The state of outdoor polluted insulation is closely related to the normal operation of power systems [1]
There was a small area of airflow deceleration zone on the electric force and air drag force with neglecting turbulent flow, the researchers in the theory analysis windward insulator, airflowwhich velocity in the vicinity of insulator was less than the entrance pointed outside thatofthe chargedthe particles have same polarity with conductors, deflected and hit velocity
To the simulation results of this paper, in another study of contamination particle deposit characteristics considering the effects of electric force and air drag force with neglecting turbulent flow, the researchers in the theory analysis pointed out that the charged particles which have same polarity with conductors, deflected and hit the lower insulator surface as sweeping past the insulator
Summary
The state of outdoor polluted insulation is closely related to the normal operation of power systems [1]. From the results of experiment and calculation of scale model insulator, it was indicated that the factor airflow has the greatest influence on particle motion; the electric force causes the deflection of contamination particles as moving between the sheds [18]. In the present studies mentioned above, the relationships between contamination particle movement, pollution situation, fluid field, and electric field were discussed from the two approaches of simulation and experiment. The quantitative analysis of the relationship between the motion of contamination particles, fluid field, and the electric field near the practical insulator is not involved. The electric field near the high voltage end of insulator under the operating environment was taken as the background electric field; the quantitative effects of airflow drag force and electric charge on contamination particle motion were analyzed with the condition of low airflow velocity
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