本文選題：雷電過電壓 + 操作過電壓　； 參考：《華北電力大學》2017年碩士論文

【摘要】：作為電力系統(tǒng)的樞紐,變電站在整個電力系統(tǒng)的高效安全運行中發(fā)揮重要作用。當變電站中的設(shè)備遭到損失將直接影響電力系統(tǒng)的安全可靠運行,造成重要的經(jīng)濟損失。據(jù)各國實際的運行經(jīng)驗看,雷電過電壓和操作過電壓是引起變電站內(nèi)過電站事故的主要原因。據(jù)統(tǒng)計每年約有40%-70%的電力系統(tǒng)故障是由雷擊引起的。同時隨著電壓等級的提升,操作過電壓的幅值也在不斷攀升,對電力系統(tǒng)的影響也越來越大,目前操作過電壓也成為決定電力系統(tǒng)絕緣水平的重要依據(jù)。本文以華能魏家峁煤電聯(lián)營發(fā)電廠500kV變電站為研究對象,使用ATP-EMTP仿真軟件對變電站內(nèi)主要設(shè)備進行模型,包括雷電流模型、輸電線路模型、桿塔模型、避雷器模型等。在雷電波入侵變電站計算方面,主要研究不同運行方式下變電站內(nèi)主要設(shè)備的過電壓情況,分析影響過電壓的因素,進而提出降低過電壓水平的措施。在操作過電壓方面,計算了變電站內(nèi)開斷輸電線路、開斷空載變壓器以及隔離開關(guān)操作過電壓。研究影響操作過電壓的因素,并提出降低操作過電壓水平的相關(guān)措施。最后,根據(jù)仿真計算結(jié)果,確定500kV變電站內(nèi)的絕緣配合,優(yōu)化絕緣配置,對魏家峁電廠500kV變電站的防過電壓措施進行指導,提出改進意見。
[Abstract]:As the hub of power system, substation plays an important role in the efficient and safe operation of the whole power system. When equipment loss in substation will directly affect the safe and reliable operation of power system, causing important economic losses. According to the practical operation experience of many countries, lightning overvoltage and operating overvoltage are the main causes of accidents in substation. According to statistics, about 40-70% of power system faults are caused by lightning strike every year. At the same time, with the increase of the voltage level, the amplitude of the operating overvoltage is rising, and the influence on the power system is becoming more and more great. At present, the operating overvoltage has become an important basis for determining the insulation level of the power system. This paper takes the 500kV substation of Huaneng Weijiaomao coal power plant as the research object, and uses the ATP-EMTP simulation software to model the main equipments in the substation, including lightning current model, transmission line model, pole tower model, lightning arrester model and so on. In the calculation of lightning wave intrusion substation, the overvoltage situation of the main equipment in the substation under different operation modes is studied, the factors affecting the overvoltage are analyzed, and the measures to reduce the overvoltage level are put forward. In the aspect of operating overvoltage, the switching off transmission line, the no-load transformer and the switching off overvoltage in the substation are calculated. This paper studies the factors affecting overvoltage and puts forward some measures to reduce the level of overvoltage. Finally, according to the results of simulation calculation, the insulation coordination in 500kV substation is determined, the insulation configuration is optimized, the measures to prevent overvoltage in 500kV substation of Weijiaomao Power Plant are directed, and the improvement suggestions are put forward.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM63;TM863

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本文編號：1844636