變電站接地系統(tǒng)應(yīng)用研究
發(fā)布時(shí)間：2018-10-21 19:39
【摘要】：電力系統(tǒng)的接地問(wèn)題是一個(gè)看似簡(jiǎn)單、而實(shí)際上卻非常復(fù)雜又至關(guān)重要的問(wèn)題,它直接關(guān)系到人身及設(shè)備的安全。為了正確應(yīng)用接地技術(shù)，提高電網(wǎng)防雷擊，避免短路電流造成人員傷害，有必要對(duì)電網(wǎng)接地技術(shù)進(jìn)行深入的研究。特別是隨著國(guó)民經(jīng)濟(jì)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(kuò)大，接地短路電流越來(lái)越大，電網(wǎng)因接地網(wǎng)因素造成的雷擊跳閘、雷擊過(guò)電壓、過(guò)電流保護(hù)事故越來(lái)越受到重視，隨著各種微機(jī)監(jiān)控設(shè)備的普遍應(yīng)用，對(duì)接地的要求也越來(lái)越高。接地系統(tǒng)不僅僅對(duì)工頻接地電阻，而且對(duì)沖擊接地電阻、熱穩(wěn)定、設(shè)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(wèn)題而引起的主設(shè)備損壞、變電所停運(yùn)等事故多有發(fā)生，給電網(wǎng)的安全穩(wěn)定運(yùn)行帶來(lái)了很大的危害，因而電力系統(tǒng)的接地問(wèn)題現(xiàn)在受到了高度的重視，特別是對(duì)新建變電站接地的要求越來(lái)越高。 本論文簡(jiǎn)單介紹了接地系統(tǒng)的理論和接地系統(tǒng)的理論計(jì)算公式，，土壤電阻率及其相關(guān)的計(jì)算公式，并介紹了如何實(shí)測(cè)土壤電阻率及其接地電阻。擬采用的接地設(shè)計(jì)方案及其技術(shù)經(jīng)濟(jì)比較；詳細(xì)論述了變電站接地網(wǎng)的設(shè)計(jì)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(lǐng)頭變電站接地網(wǎng)設(shè)計(jì)的具體實(shí)例，因地制宜地左設(shè)計(jì)方案，實(shí)施后接地電阻、接觸電壓和跨步電壓均達(dá)到了設(shè)計(jì)的要求。本人希望此設(shè)計(jì)實(shí)例在解決實(shí)際的接地問(wèn)題時(shí)能起到指導(dǎo)和借鑒作用。,在電力系統(tǒng)的實(shí)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(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM862;TM63
本文編號(hào)：2286159
[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(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM862;TM63
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