1、I 毕毕 业业 论论 文文 题目 电力系统变电站接地网分析与优化 专 业：电气工程及其自动化 学 院： 电气工程学院 年 级： 学习形式： 学 号： 论文作者： 指导教师： 职 称： 学院学院 制制 完成时间： 年 月 日 II 摘摘 要要 变电站的接地网是确保变电站工作接地、保护接地和防雷保护接地的必要设施， 也是保障人身和设备安全、保证变电站可靠运行的重要手段。在我国的电力发展史上， 曾多次出现因接地网设计不当造成的停电事故和安全隐患，因此，接地网的安全应引 起电力部门的高度重视。特别是近年来我国经济的快速发展推动了电力负荷需求节节 攀高，为了满足负荷日益增长的需要，变电站正朝大容量、特高
2、压、紧凑型方向发展。 接地短路电流越来越大，同时国家政策要求新建工程要少占或不占良田好土，建在高 土壤电阻率地区的变电站越来越多，这些因素给变电站接地设计和施工造成了困难。 为确保变电站投运后接地网的安全，就必须把好接地网设计这一关，从源头上减少和 排除接地网出现故障的隐患。 关键词关键词：变电站、地网设计、接地阻抗、测量 III Abstract The substation ground network is to ensure that the substation grounding, protective grounding and lightning protection grou
3、nding necessary facilities, and to ensure the safety of person and equipment, to ensure the important means of substation and reliable operation. Power development history in our country, has repeatedly appeared due to improper grounding network design of the power outage and safe hidden trouble, th
4、erefore, the safety of grounding network should be paid attention during the height of the power sector. Especially in recent years the rapid development of economy of our country promotes the spiralling power load demand, in order to meet the increasing needs of the load, the transformer substation
5、 is moving in the direction of large capacity, high pressure, compact development. Grounding short circuit current to the bigger, at the same time, national policy requires less (or not (new construction land, the good earth, built in high soil resistivity area substation stand more and more, these
6、factors caused difficult to substation grounding design and construction. In order to ensure the safety of substations parameter ground net.through, you must put this good grounding network design, from the source to reduce and eliminate the hidden trouble of the grounding network failure. Key words: substation, in design, grounding impedance, measurement IV 目目 录录 摘 要 II Abstrac III 目 录 IV 1 绪 论 1 1.1 接地技术的背景
