發(fā)布時間：2018-07-24 17:42

【摘要】：交聯(lián)聚乙烯(Crosslinked Polyethylene, XLPE)絕緣電力電纜作為電力傳輸媒介廣泛應(yīng)用于電力系統(tǒng)中。電力電纜在經(jīng)過長時間運行后,其絕緣內(nèi)部會產(chǎn)生水樹,使絕緣局部電場增強,造成電纜絕緣性能下降,甚至發(fā)生突發(fā)擊穿事故,影響電力系統(tǒng)的安全穩(wěn)定運行。認識水樹老化給XLPE絕緣介電性能帶來的影響,由此發(fā)展安全有效的電纜無損試驗方法,評估電纜老化程度并采取相關(guān)措施避免電力事故的發(fā)生是電力部門目前迫切需求的。與此同時,針對老化嚴(yán)重電纜,發(fā)展一種絕緣增強修復(fù)技術(shù),以此延長電纜運行壽命,對減少電力運營成本、提高經(jīng)濟與社會效益具有重要意義。 研究了水樹枝存在引起的XLPE絕緣介電性能變化特別是非線性現(xiàn)象機理；利用Maxwell-Wagner與Maxwell-Wagner-Sillars極化理論分別建立了整體絕緣與水樹老化區(qū)域的介電分析模型,并基于Ansoft搭建了含水樹XLPE絕緣的有限元仿真模型。在這些模型基礎(chǔ)上分析了組成水樹的微孔形態(tài)與水樹長度對XLPE絕緣介電常數(shù)、電導(dǎo)率、介質(zhì)損耗角正切tanδ以及內(nèi)部電場的影響。分析結(jié)果為水樹老化給XLPE絕緣性能帶來的變化與非線性特性的理解提供了科學(xué)依據(jù),也為評估方法的發(fā)展奠定了基礎(chǔ)理論支持。 在總結(jié)了國內(nèi)外電纜絕緣診斷技術(shù)的基礎(chǔ)上,詳細研究了兩種無損試驗方法—等溫松弛電流法與損耗電流諧波分量法在電纜老化評估方面的應(yīng)用,介紹了兩種方法的原理,同時分別建立了它們的分析模型,并基于實驗范例與仿真分析研究了其中的特征參量與電纜水樹老化間的關(guān)系,為這兩種評估方法的開展提供了理論指導(dǎo)。 對修復(fù)液與水反應(yīng)產(chǎn)物的介電性能提出了建議,配制了一種滿足條件的硅氧烷修復(fù)液,設(shè)計了一套硅氧烷修復(fù)液的壓力注入裝置,并對裝置的組成部件進行了詳細介紹。利用修復(fù)液對現(xiàn)場退運的電纜展開了修復(fù)工作,深入分析了修復(fù)機理,結(jié)合常規(guī)試驗、加速水樹老化試驗以及有限元電場仿真證明了硅氧烷修復(fù)液的注入能夠有效延長電纜壽命。
[Abstract]:XLPE (Crosslinked Polyethylene, XLPE) insulated power cable is widely used as power transmission medium in power system. After running for a long time, water tree will be produced inside the insulation of power cable, which will strengthen the local electric field of the insulation, cause the insulation performance of the cable to decline, and even occur sudden breakdown accident, which will affect the safe and stable operation of the power system. To understand the influence of water tree aging on the dielectric properties of XLPE insulation, to develop safe and effective cable nondestructive test methods, to evaluate the cable aging degree and to take relevant measures to avoid electrical accidents are the urgent needs of the power sector at present. At the same time, it is of great significance to develop a kind of insulation reinforcement repair technology to prolong the service life of the cable and to reduce the electric power operation cost and improve the economic and social benefits. The dielectric properties of XLPE insulation caused by the existence of water branches, especially the nonlinear phenomenon mechanism, are studied, and the dielectric analysis models of the whole insulation and water tree aging region are established by using the polarization theory of Maxwell-Wagner and Maxwell-Wagner-Sillars, respectively. The finite element simulation model of XLPE insulation based on Ansoft is built. Based on these models, the effects of the micropore morphology and the length of the water tree on the dielectric constant, conductivity, dielectric loss angle tangent tan 未 and internal electric field of XLPE are analyzed. The results provide a scientific basis for understanding the variation and nonlinear characteristics of XLPE insulation caused by water tree aging, and also lay a foundation for the development of evaluation methods. On the basis of summing up the diagnosis technology of cable insulation at home and abroad, the application of two nondestructive testing methods, isothermal relaxation current method and loss current harmonic component method, in cable aging evaluation are studied in detail. The principles of the two methods are introduced. At the same time, their analysis models are established, and the relationship between the characteristic parameters and cable water tree aging is studied based on the experimental example and simulation analysis, which provides theoretical guidance for the development of these two evaluation methods. In this paper, some suggestions on the dielectric properties of the product of the reaction between the repair solution and the water are put forward, a kind of siloxane repair solution which meets the conditions is prepared, a set of pressure injection device for the siloxane repair solution is designed, and the components of the device are introduced in detail. The repair work of the retroactive cable was carried out by using the repair fluid, and the repair mechanism was analyzed in depth, and combined with the conventional test, Accelerated water tree aging test and finite element electric field simulation show that the injection of siloxane repair solution can effectively prolong the cable life.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM247

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