【作者】 马海忠；

【导师】 刘宗歧；

【作者基本信息】 华北电力大学（北京） ， 电力系统及其自动化， 2007， 硕士

【摘要】 ±800kV高压直流输电接地极入地电流4000A,接地极半径达到数百米,入地电流产生的地面电位比±500kV更高,对环境的影响将更大,因此特高压直流输电接地极的设计、运行和维护等问题亟待研究。论文结合金沙江一期特高压直流输电工程,提出研究±800kV高压直流输电接地极的基本特性。论文内容包括:论述了大地电磁测深法(MT法)测量接地极土壤电阻率的原理,根据实测结果建立了金沙江一期直流输电工程接地极的大地电阻率模型;利用镜象法和等效法推导了接地电阻和接地极电位计算公式;推导了接地极地面跨步电压计算公式;给出了金沙江一期东阳接地极设计方案;仿真结果表明,给出的特高压直流输电接地极基本特性的分析结论是可信的。更多还原

【Abstract】 The current injecting to earth of the±800 kV high voltage direct current transmission system ground electrode is 4000 A, the ground electrode radius will reach several hundred meters , the earth potential induced by earth current are higher than that of±500 kV, the effect to the environment will more severe, therefore the problem of design, operation and maintenance about ultra high voltage direct current ground electrode need study. This paper studies the basic characteristics of ground electrode, exampled by Jin Sha river one issue project. Main content is included: Theory and application fields of magnetotelluric method(MT) are discussed; Make use of image method and equivalent method,the calculation formulas about earth resistance and potential distribution are deduced; Step voltage calculation formula is given; Design project of Dongyang electrode Jin Sha river one issue are analyzed; Emulating with the ANSYS software, the conclusions about UHVDC ground electrode are reliable.更多还原