| Summary: | 碩士 === 國立高雄應用科技大學 === 電機工程系博碩士班 === 104 === Overhead transmission line is essential to power transmission. Built on open areas, overhead transmission lines are struck by lightning quite often. This thesis uses simulation analysis software to verify and discuss lightning protection measures of transmission lines in Taiwan.The measures are increasing ground wire protective angles, strengthening line insulation, adding coupling ground wires, lowering the resistance of grounding system and installing line surge arresters. Use simulation analysis software to create some same modules as actual transmission line parameters. Then by increasing ground wire protective angles, strengthening line insulation, adding coupling ground wires, lowering the resistance of grounding system or installing line surge arresters, lightning protection features are investigated. With applying the above lightning protection measures on the 69kV transmission line A and 161kV transmission line B, the simulation result shows that only lowering the resistance of grounding system is most ineffective to lightning protection and flashover improvement. Strengthing insulation of insulators or widening arcing horn gap can increase lightning impulse negative polarity critical flashover voltage and prevent back flashover. Increasing ground wire protective angles, adding coupling ground wires, or installing line surge arresters can hide lightning path, control voltage difference of insulator string and reduce flashover and back flashover of insulators respectively. Those measurements helps improve lightning protection systems. To improve reliability and qulity of power supply, the result of this research will be a reference at the lightning protection of overhead transmission lines.
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