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| 研究生： |
陳立雄 Chen, Li-Hsiung |
|---|---|
| 論文名稱： |
接地棒之新型接地電阻低減劑之研究 Research on Novel Ground Resistance Reduction Agents for Ground Rods |
| 指導教授： |
陳建富
Chen, Jiann-Fuh 梁從主 Liang, Tsorng-Juu |
| 學位類別： |
博士 Doctor |
| 系所名稱： |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年： | 2008 |
| 畢業學年度： | 96 |
| 語文別： | 英文 |
| 論文頁數： | 104 |
| 中文關鍵詞： | 接地電位 、電阻係數 、接地電阻低減劑 、水淬爐石 、轉爐石 、接地棒 、地面電壓 、接地系統 、接地電阻 、步級電壓 、接地 |
| 外文關鍵詞： | Grounding, step voltage, earth surface voltage, resistivity, ground rod, basic oxygen furnace slag, granulated blast furnace slag, ground resistance reduction agent, grounding system, ground resistance, ground potential |
| 相關次數： | 點閱：164 下載：3 |
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接地之目的是在確保人員與電氣設備之安全，一個理想的接地系統其接地電阻須接近於零歐姆，但實際上接地電阻是不會等於零歐姆。當故障電流流經接地系統時，會產生接地電位升，接地系統必須確保由於故障電流所產生之接地電位升不會造成人員感電及設備破壞，因此一般均要求接地電阻越低越好；然而在一些高電阻係數的區域，譬如砂礫、沙質土壤及岩石等區域，以直接埋設接地棒的方式是不可能獲得一個低的接地電阻值，所以加入接地電阻低減劑是一可用的作法之一。
本論文提出使用水淬爐石及轉爐石當作接地電阻低減劑之主要材料，加入不同比例的水、水泥及食鹽，考慮電阻係數與凝固強度等因素，找出一個有效組合作為接地電阻低減劑之用，並經由實驗驗證本論文提出之接地電阻低減劑可以有效地降低接地電阻。接著本論文也討論接地電阻低減劑之使用量並推導在減少相同接地電阻情況下之接地電阻低減劑最佳使用量，接地電阻低減劑使用量越多，接地電阻會越低，然而當接地電阻低減劑使用量增加至一定數量時，降低接地電阻的作用會出現飽和現象，所以接地電阻低減劑之使用量必須避開飽和區域以達到接地電阻低減劑之最高使用效率。最後本論文也提出計算埋入式接地棒連接絕緣引線之最大步級電壓及其位置之方法，由模擬結果可知；接地棒之接地電阻、地面電壓及步級電壓會隨著接地棒之埋入深度增加而降低。而推入式接地棒其接地電阻、地面電壓及步級電壓均高於埋入式接地棒連接絕緣引線之方法，所以本論文建議接地工程施工時採用埋入式接地棒連接絕緣引線之方法。本論文之研究結果不僅提出新型接地電阻低減劑且也探討接地安全之問題。
The goal of grounding is to ensure the safety of humans and electrical equipment. An ideal grounding system should provide near-zero ground resistance. In practice, however, ground resistance is not near zero. Ground potential should rise when the fault current flows into the ground system. The grounding system thus should ensure that ground potential rise that occurs due to fault current will not cause electric shock or equipment damage. Therefore, the lower ground resistance demands, the better. Nevertheless, in some areas with high soil resistivity, such as in gravel, sandy soil or rocky regions, it may not be possible to obtain low ground resistance. So, the addition of a ground resistance reduction agent may be one of most suitable measures.
First, this dissertation proposes using granulated blast furnace slag and basic oxygen furnace slag as the main materials in a ground resistance reduction agent. Adding different proportions of water, cement and salt, resistivity and clot strength of ground resistance reduction agent are considered in the quest to find an effective combination. The effectiveness of the identified combination in reducing ground resistance is experimentally verified. Then, this research discusses quantity of ground resistance reduction agent used for ground rod, and derives optimum quantity of ground resistance reduction agent needed to reduce ground resistance by the same amount. Ground resistance decreases with increasing quantity of ground resistance reduction agent used. However, ground resistance reduction effect will display the saturation phenomenon when the quantity of ground resistance reduction agent used increases to a certain level. Additional quantities of ground resistance reduction agent should be avoided in saturated areas in order to maximize its efficient use. Finally, this dissertation proposes a method for calculating the position and magnitude of maximum step voltage for buried ground rod with insulation lead. Simulation results show that ground resistance, earth surface voltage, and step voltage decrease as depth of buried ground rod increases. Ground resistance, earth surface voltage, and step voltage in driven ground method exceed those of buried ground rod with the insulation lead. Therefore, this dissertation suggests that grounding should be achieved by the use of buried ground rods with insulation lead. Results of this research not only provide a valuable method for decreasing ground resistance but also increase the safety of grounding.
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校內：2010-09-09公開校外：2012-09-09公開