Lightning Surge and Switching Surge Characteristics of Grounding System with Multi-gird in the Large High-Tech Factories

• Main Authors: Meng-Chang Wu, 吳孟昌
• Other Authors: Chih-Ju Chou
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/87260026030471237875

碩士 === 中原大學 === 電機工程研究所 === 90 === This study is to analyze the lightning and switching surges characteristics of grounding system of typical large integrated circuit (IC) manufacturing plants fed with 161kV power. The thesis analyzes lightning and switching surges characteristics of grounding system directly form the view point of electromagnetic principles, i.e. analyzes the electromagnetic characteristics of grounding system with respect to the lightning surges and switching surges. The analysis items included the ground surface potentials and electromagnetic fields. Based on the analysis results, the step and touch voltages related to human safety, and the transient ground potential rise (GPR´s) and ground potential difference (GPD´s) related to equipment protection are analyzed; from which, we can assess the damages of personnel and equipments on the grounding system. The analysis results have shown that the GPD´s produced by switching operation and lightning will threaten the safety of personnel, low voltage equipments and weak systems. For improving the protection performances of grounding system against the lightning and switching surges, the improving methods are proposed here. The improving methods will also contribute to upgrading the power quality.