【Title】The force and motion characteristics of dust particles near the high voltage part of HVDC insulator
【Abstract】In order to understand the force and motion characteristics of contamination particles under the influence of electric field force and air drag force near the HVDC insulator, the simplified model of ±800kV composite insulator high voltage end which has more serious pollution situation was established. By the finite element method, the background electric field as with similar distribution near the HVDC insulator high voltage end was built, the steady turbulent flow field was simulated with the incoming airflow velocity was set to 3 m/s or 2 m/s. These contamination particles were uniform charged, the gravity and the computed results of electric field intensity and fluid field airflow velocity were loaded on it. The trajectories of contamination particles were gained. The ordering relationship of electric field force and air drag force on the particles, the relationship of quantities of electric charge on particles and probability of particles contact insulator surfaces were analyzed. It is found that air drag force is significantly greater than electric field force with less quantities of electric charge on particles. As fold increase in quantities of electric charge, electric field force was increased in proportion, and airflow drag force was increased slower than it. The probability of particles contacted insulator surfaces increases with the increasing of quantities of electric charge on particles, but after reaching a certain level of quantities of electric charge as the electric field force magnitude is similar to air drag force magnitude and forming a state of force equilibrium, the contact probability decreases with the increasing of quantities of electric charge.
【Keywords】HVDC; electric field force; air drag force; low wind velocity; contact probability; multi-physics field【作者】
|ZHANG Gongda||: School of electrical engineering, Wuhan University, Wuhan 430072, China;|
|LAN Lei||: School of electrical engineering, Wuhan University, Wuhan 430072, China;|
|WEN Xishan||: School of electrical engineering, Wuhan University, Wuhan 430072, China;|
|LIU Shitao||: Electric Power Research Institute, State Grid Ningxia Electrical Power Company, Yinchuan 750002，China;|
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