Characterisation of charring spread rate of single-phase contact trees in distribution lines
Aiming at ignition and penetration of single-phase tree-contract in distribution lines,a full-scale test platform is designed to analyze the spreading characteristics of tree-contract carboniza-tion.First,the evolution of single-phase lap trunk ignition vegeta-tion and its leakage current,voltage,impedance and temperature characteristics are analyzed,and the four development phases of initial lap,water evaporation,open flame spreading,and combus-tion penetration are defined.Then,the test found that the flame was formed on charring traces,and then analyzed the influence law of the charring spreading penetration rate on the impedance and current changes.Finally,considering the thickness of natu-rally growing vegetation,it was obtained that the spread rate in-creased by 119%when the diameter of Camellia sinensis was re-duced from 52.77 mm to 30.17 mm;further,the mechanism of negative correlation between size and spread rate was revealed from the electrical properties of wood(breakdown field strength)and heat conduction angle(heat capacity).
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