Abstract
Most electrical transmission lines are located in forests, and currently in South Korea, deregulation has allowed various structures to be built on the ground below transmission lines. Events of fires occurring below high-voltage transmission lines can lead to large-scale electrical accidents. To prevent such accidents, this study examined the ignition properties of combustible materials and their relationship with the reduction in air dielectric strength. Experiments were performed on two types of synthetic resins and lumbers, namely cypress and pine. A cone calorimeter was used to measure ignition properties such as effective heat of combustion, heat release rate, and soot yield. In addition, we built a dielectric strength testing device to measure the reduction in air dielectric strength caused by flames. These measurement results can serve as a basis for revising fire safety standards.
Highlights
Transmission lines are exposed to various forms of combustible materials such as forests, structures, and plains
Zi-heng Pu et al analyzed the properties of air dielectric strength under transmission lines during forest fires
We confirmed the tendency of dielectric strength to change according to ignition properties
Summary
Transmission lines are exposed to various forms of combustible materials such as forests, structures, and plains. Peng Li measured the dielectric strength of air gaps by measuring the amount of conductive particles created during forest fires. Tian Wu et al analyzed CCTV footage in which transmission lines had short-circuited due to forest fires They performed direct experiments to analyze the dielectric strength of air during similar forest fires. Zi-heng Pu et al analyzed the properties of air dielectric strength under transmission lines during forest fires. The study examined the frequency of short-circuits between phases and short-circuits to the ground below transmission lines caused by forest fires. It was determined that the reduction in the dielectric strength of air below transmission lines occurs mainly in the flame area, and the flame height does not reach the region between phases [9]. TShFeIKSOS F56I6S0O s5ta6n60dastradnedxaprdereimxpeenrtiaml ednetvailcdeewviacseuwsaesdutsoemd etoasmuereasaunrde andalaynzaelythzee itghneiitgionnitipornoperortpiesrotfieesxopfereixmpenritmalemntatlemriatlse,riianlcsl,uindcinlugdtihnrgeethtryepeetsyopfespolfypmoelyrms, ecrysp, rceyspsr, emsse,dmiuemdiudmendsietnyfisbiteyrbfiobaerrdb,oaanrd,haenpdtahneep[t1a4n]e. [14]
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