电气专业毕业设计外文翻译--防雷接地.docx

PAGE \* MERGEFORMAT - 1 - Lightning protection grounding Abstract The significance of lightning p.rotection and mitigation on very little money to prevent large losses, and its function is to use scientific means avoid natural disasters. Grounding is to make the system has been included in the lightning protection lightning energy discharge into the earth, and good grounding can effectively reduce the online guide overvoltage, avoid counterattack. Avoid ground is the most important aspect of technology, whether sings rem, induction lightning, or other forms of ray, ultimately the lightning current into the earth. Therefore, no reasonable and good grounding device is cant reliably the lightning strikes. The smaller the grounding resistance, come loose flow is quicker, lightning objects the time to maintain high potential more short, the less risk Key Words: Lightning protection; Grounding; Current; potential 1 introduction In recent years, many domestic and foreign standards do not advocate information equipment using independent grounding device, recommend the use of common earthing system. For example, the 2000 edition of the GB50057-94 design code for protection of structures in point out clearly: every building itself should adopt common earthing system to be the buildings within the various grounding are unified to buildings based on, or outdoor grounding device. When the building was hit by lightning, power system voltage and electrical equipment grounding voltage rises at the same time, keep the equipment working voltage constant, so that the electronic equipment from lightning strikes can work normally. Common earthing system usually use the building foundation grounding electrode, the grounding resistance less than 1 ohm in general, if the equipment grounding resistance requirement is lower, should take the minimum value. The ground that has been incorporated into the lightning protection system of lightning energy drain into the earth, good grounding do