本文選題：盆式絕緣子　切入點(diǎn)：電場優(yōu)化　出處：《上海電力學(xué)院》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：GIS由于具有占地面積小、結(jié)構(gòu)緊湊、可靠、安全、靈活等優(yōu)點(diǎn),近年來在超高壓和特高壓變電站中得到了廣泛的應(yīng)用。GIS中的盆式絕緣子起著支撐導(dǎo)體、隔離氣室和電氣絕緣的重要作用。當(dāng)絕緣子的沿面場強(qiáng)超過起暈場強(qiáng)時(shí),將會(huì)產(chǎn)生電暈放電。實(shí)踐經(jīng)驗(yàn)表明,在盆式絕緣子上安裝均壓環(huán)和屏蔽罩可有效改善絕緣子沿面電場和電位分布。本文運(yùn)用有限元分析軟件Ansoft對盆式絕緣子建立模型,進(jìn)行電場計(jì)算,并以此確定盆式絕緣子均壓環(huán)和屏蔽罩結(jié)構(gòu)優(yōu)化目標(biāo);在此基礎(chǔ)上,引入神經(jīng)網(wǎng)絡(luò)算法,利用BP神經(jīng)網(wǎng)絡(luò)擬合了均壓環(huán)和屏蔽罩各結(jié)構(gòu)參數(shù)與優(yōu)化目標(biāo)之間的關(guān)系,對均壓環(huán)和屏蔽罩的結(jié)構(gòu)參數(shù)進(jìn)行了優(yōu)化設(shè)計(jì),得到最優(yōu)結(jié)構(gòu)參數(shù),克服了傳統(tǒng)窮舉法計(jì)算量大、消耗時(shí)間長的問題。實(shí)驗(yàn)表明,在盆式絕緣子上安裝優(yōu)化過的均壓環(huán)和屏蔽罩可以大大降低盆式絕緣子沿面最大電場強(qiáng)度,有效改善盆式絕緣子沿面電場不均勻程度。本文的研究工作主要包括以下幾部分:(1)介紹了課題的研究現(xiàn)狀以及電磁場和有限元基本原理以及神經(jīng)網(wǎng)絡(luò)算法,詳細(xì)地介紹了BP神經(jīng)網(wǎng)絡(luò)算法的模型、工作原理以及工作流程,為后續(xù)章節(jié)均壓環(huán)和屏蔽罩結(jié)構(gòu)參數(shù)的優(yōu)化設(shè)計(jì)提供理論基礎(chǔ)。(2)在盆式絕緣子的設(shè)計(jì)過程中,安裝合適的均壓環(huán)有助于改善電位和場強(qiáng)分布,減少電暈以及擊穿的可能性,增強(qiáng)盆式絕緣子的電氣性能。利用BP神經(jīng)網(wǎng)絡(luò)算法,以盆式絕緣子沿面最大場強(qiáng)和均壓環(huán)表面最大場強(qiáng)作為目標(biāo)函數(shù),對均壓環(huán)的結(jié)構(gòu)參數(shù)進(jìn)行優(yōu)化設(shè)計(jì)。(3)在盆式絕緣子的設(shè)計(jì)過程中,在盆式絕緣子上安裝屏蔽罩可有效改善絕緣子沿面電場和電位分布。盆式絕緣子的沿面電場受屏蔽罩的形狀、尺寸和位置等影響,因此安裝合適的屏蔽罩可以有效改善盆式絕緣子沿面電場和電位,減少電暈和閃絡(luò)現(xiàn)象。利用BP神經(jīng)網(wǎng)絡(luò)算法,以盆式絕緣子沿面最大場強(qiáng)和屏蔽罩表面最大場強(qiáng)作為目標(biāo)函數(shù),對屏蔽罩的結(jié)構(gòu)參數(shù)進(jìn)行優(yōu)化設(shè)計(jì)。(4)在盆式絕緣子的設(shè)計(jì)過程中,針對在盆式絕緣子上安裝外法蘭對其電場強(qiáng)度有無影響的質(zhì)疑,進(jìn)行建模分析計(jì)算;同時(shí),對盆式絕緣子內(nèi)法蘭與樹脂間氣隙進(jìn)行建模計(jì)算,從而得到優(yōu)化設(shè)計(jì)。
[Abstract]:Due to its small area, compact structure, reliability, safety and flexibility, GIS has been widely used in UHV and UHV substations in recent years. The important role of isolating gas chamber and electrical insulation. Corona discharge will occur when the plane field strength of insulator exceeds the intensity of halo field. The distribution of electric field and potential along the surface of the insulator can be effectively improved by installing the equalizing ring and shielding cover on the basin insulator. In this paper, the finite element analysis software Ansoft is used to establish the model of the basin insulator and calculate the electric field. On the basis of this, the optimization target of the structure of the basin insulator equal pressure ring and shield cover is determined, and on this basis, the neural network algorithm is introduced to fit the relationship between the structural parameters of the uniform pressure loop and the shield cover and the optimized target, and the BP neural network is used to fit the relationship between the structure parameters of the uniform pressure loop and the shield cover. The structural parameters of the uniform pressure loop and the shield are optimized, and the optimal structural parameters are obtained. The problems of the traditional exhaustive method are overcome, such as the large calculation amount and the long time consumption. The experimental results show that, The maximum electric field strength along the surface of the basin insulator can be greatly reduced by installing the optimized equalizing ring and shielding cover on the basin insulator. The research work of this paper mainly includes the following parts: 1) introduce the research status of the subject, electromagnetic field, basic principle of finite element and neural network algorithm. The model, working principle and working flow of BP neural network algorithm are introduced in detail, which provides a theoretical basis for the optimization design of the structural parameters of the uniform pressure ring and shield cover in the subsequent chapters in the design process of the basin insulator. Installing suitable equalizing ring can improve the distribution of potential and field strength, reduce the possibility of corona and breakdown, and enhance the electrical performance of basin insulator. Taking the maximum field strength along the plane of the basin insulator and the maximum field strength on the surface of the uniform pressure ring as the objective function, the optimum design of the structural parameters of the uniform pressure ring is carried out in the design process of the basin insulator. Installing a shield on a basin insulator can effectively improve the electric field and potential distribution along the surface of the insulator. The electric field along the surface of the basin insulator is affected by the shape, size and position of the shield. Therefore, installing a suitable shield can effectively improve the electric field and potential along the surface of the basin insulator and reduce the corona and flashover phenomena. Taking the maximum field strength along the surface of the basin insulator and the maximum field strength on the shield surface as the objective function, the structural parameters of the shield are optimized in the design process of the basin insulator. In view of the doubt that the external flange installed on the basin insulator has an effect on the electric field strength, the modeling analysis and calculation are carried out, and the air gap between the flange and the resin inside the basin insulator is modeled and calculated, and the optimum design is obtained.
【學(xué)位授予單位】：上海電力學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM216

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