Abstract
In recent years, extreme high temperature weather occurs frequently, which easily causes forest fires. The forest fire is prone to the trip accident of the transmission line. Previous studies show that charged combustion particles cause electric field distortion in the gap below the transmission line, and trigger discharges near the conductor area. The motion and distribution characteristics of combustion particles in the gap have an important influence on the discharge characteristics. Therefore, the size and morphology of combustion particles are analyzed through combustion experiments with typical vegetation. The combustion particles are mainly affected by the air drag force, electric field force and gravity. The interaction and influence of temperature, fluid, electric field and the multi-physical field of particle motion are comprehensively analyzed. A two dimensional (2D) axisymmetric simulation model is established by simplifying the flame region. According to the heat release rate of vegetation flame combustion, the fluid temperature and velocity are calculated. Combined with the fluid field and electric field, the forces on particles and movement are calculated. The results can provide a basis for the analysis of the electric field distortion, and further study the discharge mechanism of the gap under the condition of vegetation flame.
Highlights
In recent years, more and more extreme weather has led to frequent forest fires
The results can provide a basis for the analysis of the electric field distortion, and further study the discharge mechanism of the gap under the condition of vegetation flame
Due to the limited transmission corridor, more and more extra high voltage/ultra-high voltage (EHV/UHV) transmission lines will inevitably pass through high forest fire risk areas
Summary
More and more extreme weather has led to frequent forest fires. China’s energy center is in the central and western regions, while the load center is on the eastern coast. A large number of charged particles in flame are produced by a combustion reaction, thermal ionization and an electric field. They increase gap conductivity and charge combustion particles. Experiments show that the spatial electric field distortion under positive and negative DC voltage is significantly different from that under the influence of particle charging and motion characteristics. The analysis of the distortion characteristics of the electric field plays an important role in studying the breakdown mechanism of the flame gap under DC voltage [14,15]. It is necessary to analyze the movement characteristics of vegetation combustion particles in a flame gap under DC voltage. Considering the drag force, electric field force and gravity, the forces on particles and movement of the particles in the process of rising are calculated
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