本文選題：變電站　切入點：接地網(wǎng)系統(tǒng)　出處：《華北電力大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：變電站接地系統(tǒng)通過將電力系統(tǒng)和設(shè)備與地相連來維護電力系統(tǒng)安全可靠運行。當系統(tǒng)出現(xiàn)故障時,接地系統(tǒng)會將故障電流引入大地,限制系統(tǒng)最大的電壓抬升,從而保證人員和設(shè)備的安全。近幾年,我國電力系統(tǒng)不斷發(fā)展,與此同時,由于接地系統(tǒng)設(shè)計不合理,接地電阻不符合要求而導(dǎo)致大故障電流事故屢見不鮮,不僅經(jīng)濟損失巨大,而且對社會造成嚴重的間接經(jīng)濟損失�；诖�,本文提出變電站接地系統(tǒng)的優(yōu)化設(shè)計方法,以使地表電位均勻分布,跨步和接觸電壓都顯著減小。本文首先分析變電站接地系統(tǒng)的意義、難點及常用的降低接地電阻的方法,然后對變電站接地系統(tǒng)電阻、故障電流、土壤結(jié)構(gòu)情況進一步研究,并建立相應(yīng)模型,特別對分流系數(shù)的原理及影響因素進行了分析。通過考慮變電站安全指標對接地系統(tǒng)設(shè)計的影響,提出多種接地系統(tǒng)設(shè)計方案進行比較分析。最后分析變電站主要隔離措施的設(shè)計,并以杭州110kV楊嶺變電站接地網(wǎng)為例,對其接地網(wǎng)系統(tǒng)進行優(yōu)化設(shè)計并對提出的設(shè)計方案進行評估。
[Abstract]:The substation grounding system maintains the safe and reliable operation of the power system by connecting the power system and equipment to the ground. When the system fails, the grounding system will introduce the fault current into the earth, limiting the maximum voltage lift of the system. So as to ensure the safety of personnel and equipment. In recent years, the power system of our country has been developing continuously. At the same time, due to the unreasonable design of the grounding system and the failure of grounding resistance to meet the requirements, it is common to see large fault current accidents. Not only the economic loss is huge, but also the social indirect economic loss is serious. Based on this, this paper puts forward the optimization design method of substation grounding system, in order to make the surface potential distribute evenly. In this paper, the significance, difficulties and common methods of reducing grounding resistance of substation grounding system are analyzed, and then the resistance, fault current and soil structure of substation grounding system are further studied. The corresponding model is established, especially the principle of shunt coefficient and the influencing factors are analyzed. The influence of substation safety index on the design of grounding system is considered. Finally, the design of main isolation measures of substation is analyzed, and the grounding network of 110 kV Yangling substation in Hangzhou is taken as an example. The grounding grid system is optimized and the proposed design scheme is evaluated.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM862;TM63

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本文編號：1621083