Abstract
Energized insulator’s surface contamination is greatly affected by its electric field properties. However, few reports about the electric field influencing mechanism on the pollution deposition have been presented. In this paper, the coupling-physics model of a three-unit XP-160 insulator string was established, and the particles’ deposition process was simulated by using the finite element method. The effects of the electric field on the pollution particles’ motion were analyzed. Research results indicate that the closer to the insulator string, the larger the intersection angle θ between the electric force and its horizontal component. The main function of the electric field on insulator contamination is that it changes the pollution particles’ vertical moving speed, thus accelerating the particles’ deposition process. The particle capture coefficient ratio ck can be used to reflect the pollution degree discrepancy between DC-energized and non-energized insulators. In this paper the ratio ck of the DC-energized to non-energized condition is in the range of 1.04 to 1.98, very close to the field measurement results of the DC pollution ratio k.
Highlights
Due to the deterioration of the atmospheric environment in China, operating HVDC transmission lines are still under risk of pollution flashover accidents [1,2]
The main function of the electric field during insulator top surface as previously analyzed. This can be detected in the opposite way, in that the electric force contamination is that it changes the particles’ vertical motion, especially when dp is within 1–20 μm
This paper presents the analysis of direct current (DC) electric field effects on insulator pollution particle deposition, as well as the pollution degree
Summary
Due to the deterioration of the atmospheric environment in China, operating HVDC transmission lines are still under risk of pollution flashover accidents [1,2]. To obtain the pollution accumulation influencing factors, Zhang et al [6] analyzed the airflow field distribution and particle collision coefficient around an insulator through dynamic fluid simulation. They studied the relationships among the particle phase volume fraction, wind velocity, particle diameter, insulator surface pollution degree, and distribution by using the Euler-Euler multiphase simulation method [7]. Some field pollution tests on energized and non-energized insulators operating in transmission lines were carried out [12,13], which showed that DC lines’ insulators collect more pollution than AC lines Those studies above presented essential references for the insulator pollution deposition performances. Research results are valuable for pollution level mapping works and the external insulation design of DC lines
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