Combined effect of different fields on the motion characteristics of dust particles around the insulators
Combined effect of different fields on the motion characteristics of dust particles around the insulators
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DOI：
10.1109/ceidp.2011.6232673
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发表时间：
2011-10
期刊：
影响因子：
--
通讯作者：
Jing Wang;Xidong Liang;Lin Chen;Yu Liu
中科院分区：
文献类型：
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作者：
Jing Wang;Xidong Liang;Lin Chen;Yu Liu
绝缘子污闪严重威胁电力系统的安全和运行保障。绝缘子上的污秽堆积是污闪发生的前提，而绝缘子的污秽堆积特性在很大程度上取决于运行中绝缘子周围尘粒的运动特性。本文通过实验和数值计算的方法研究了电场、空气流体场和重力场对尘粒运动的综合影响。计算了实际绝缘体周围的电场和电势的分布。结果表明极化力非常弱。一旦粒子带电，电场力就起作用，可以驱动粒子沿着电场线移动。当有强风时，稳态阻力占主导地位，颗粒随风移动。这些结果可以更好地解释绝缘子的污物积累特征，并提出一些减少污物积累的措施。
Pollution flashover of the insulators threatens the safety and operation security of the power system severely. Contamination accumulation on the insulators is the precondition of the pollution flashover, while the contamination accumulation characteristics of the insulators depend on the motion characteristics of the dust particles moving around the insulators in service to a great degree. This paper researched the combined effect of the electric field, the air fluid field and the gravitational field on the dust particles' motion by means of experiments and numerical calculation. The distribution of the electric field and the electric potential around an actual insulator were calculated. The results indicate that the polarization force is very weak. Once the particles are charged, the electric field force acts and can drive the particles to move along the electric field lines. When there is a strong wind, the steady-state drag force is dominant and the particles move with the wind. These results can better explain the contamination accumulation characteristics of the insulators, and some measures are suggested to reduce the contamination accumulation.