【摘要】：電力系統(tǒng)的接地問題是一個看似簡單、而實際上卻非常復雜又至關重要的問題,它直接關系到人身及設備的安全。為了正確應用接地技術，提高電網(wǎng)防雷擊，避免短路電流造成人員傷害，有必要對電網(wǎng)接地技術進行深入的研究。特別是隨著國民經(jīng)濟的發(fā)展，電力系統(tǒng)的跨越式發(fā)展，電網(wǎng)規(guī)模急劇擴大，接地短路電流越來越大，電網(wǎng)因接地網(wǎng)因素造成的雷擊跳閘、雷擊過電壓、過電流保護事故越來越受到重視，隨著各種微機監(jiān)控設備的普遍應用，對接地的要求也越來越高。接地系統(tǒng)不僅僅對工頻接地電阻，而且對沖擊接地電阻、熱穩(wěn)定、設備接觸電壓、跨步電壓、地電位干擾也有一系列的要求。在上饒地區(qū)以前由于接地系統(tǒng)的問題而引起的主設備損壞、變電所停運等事故多有發(fā)生，給電網(wǎng)的安全穩(wěn)定運行帶來了很大的危害，因而電力系統(tǒng)的接地問題現(xiàn)在受到了高度的重視，特別是對新建變電站接地的要求越來越高。 本論文簡單介紹了接地系統(tǒng)的理論和接地系統(tǒng)的理論計算公式，，土壤電阻率及其相關的計算公式，并介紹了如何實測土壤電阻率及其接地電阻。擬采用的接地設計方案及其技術經(jīng)濟比較；詳細論述了變電站接地網(wǎng)的設計步驟及接地系統(tǒng)的施工工藝。介紹了幾種常見的降阻措施，綜合楓領頭變電站接地網(wǎng)設計的具體實例，因地制宜地左設計方案，實施后接地電阻、接觸電壓和跨步電壓均達到了設計的要求。本人希望此設計實例在解決實際的接地問題時能起到指導和借鑒作用。,在電力系統(tǒng)的實際工程中具有一定的意義。
[Abstract]:The grounding problem of power system is a seemingly simple, but in fact very complex and crucial problem, which is directly related to the safety of personal and equipment. In order to apply the grounding technology correctly, to improve the lightning protection of the power network and to avoid the personnel injury caused by the short-circuit current, it is necessary to deeply study the grounding technology of the power network. Especially with the development of national economy and the leap-forward development of electric power system, the scale of power grid expands rapidly, the grounding short-circuit current becomes larger and larger, the lightning tripping and lightning overvoltage caused by the factors of grounding grid. More and more attention has been paid to the accident of over-current protection. With the widespread application of various microcomputer monitoring equipment, the requirement of grounding is becoming more and more high. Grounding system has a series of requirements not only for power frequency grounding resistance, but also for impulse grounding resistance, thermal stability, equipment contact voltage, step voltage and ground potential interference. In Shangrao area, accidents such as main equipment damage and substation outage caused by grounding system problems often occurred, which caused great harm to the safe and stable operation of the power network. Therefore, the grounding problem of power system is paid more and more attention, especially for the new substation grounding. This paper briefly introduces the theory of the grounding system and the theoretical calculation formula of the grounding system, the soil resistivity and its related calculation formulas, and how to measure the soil resistivity and its grounding resistance. The grounding design scheme and its technical and economic comparison are proposed, and the design steps of substation grounding grid and the construction technology of the grounding system are discussed in detail. This paper introduces several kinds of common measures of reducing resistance, synthesizes the concrete examples of the grounding network design of the Feng-lead substation, according to the local conditions, the left design scheme, the grounding resistance, the contact voltage and the stride voltage all meet the requirements of the design. I hope this design example can play a guiding and referential role in solving the actual grounding problem, and it is of certain significance in the practical engineering of power system.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM862;TM63

【參考文獻】

相關期刊論文 前6條

1 王志隆;劉海燕;;電容式電壓互感器參數(shù)的測試方法分析[J];山西電力;2009年05期

2 姬黎波,王紅斌,王祖林;帶電測試電容式電壓互感器介損的應用研究[J];廣東電力;2003年01期

3 練成雄;;電容式電壓互感器(CVT)介損和電容量測量分析[J];廣東科技;2008年08期

4 秦勇明,王振偉;電容式電壓互感器的應用[J];江蘇電機工程;2002年03期

5 馬杰聰;;變頻介損儀在電容式電壓互感器不拆線試驗中的應用[J];科技信息;2010年05期

6 景國彥;白艷芳;;電容式電壓互感器試驗分析[J];內(nèi)蒙古電力技術;2006年S4期

本文編號：2286159