科研之友
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摘要
Forest fires have caused frequent tripping accidents of transmission lines. A large number of particles are generated and charged in the vegetation fire. These particles are easily drifted into the flame gap under the transmission line. That the charged particles cause serious electric field distortion and triggering discharge are the key factors to cause the gap breakdown. In order to analyze the difference of flame space electric field distortion between positive and negative DC polarity, it is necessary to study the movement and distribution of combustion particles in the gap. Firstly, the motion characteristics of particles under positive and negative DC voltage are analyzed in this paper. Then, a multi-physical fields coupled simulation model of temperature, fluid, electric field and particle motion field is established to simulate and analyze the force characteristics and movement process of different particles under positive and negative polar voltage. Finally, the particles distribution is analyzed according to the characteristics of combustion particles. The results show that with the expansion of the particle size, the smaller the critical charge-mass ratio is, the larger the particle size is, and the smaller the particle size is, the easier it is to be captured by the electrode.
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