交联聚乙烯电力电缆绝缘老化评估及修复方法研究
发布时间：2018-07-24 17:42
【摘要】：交联聚乙烯(Crosslinked Polyethylene, XLPE)绝缘电力电缆作为电力传输媒介广泛应用于电力系统中。电力电缆在经过长时间运行后,其绝缘内部会产生水树,使绝缘局部电场增强,造成电缆绝缘性能下降,甚至发生突发击穿事故,影响电力系统的安全稳定运行。认识水树老化给XLPE绝缘介电性能带来的影响,由此发展安全有效的电缆无损试验方法,评估电缆老化程度并采取相关措施避免电力事故的发生是电力部门目前迫切需求的。与此同时,针对老化严重电缆,发展一种绝缘增强修复技术,以此延长电缆运行寿命,对减少电力运营成本、提高经济与社会效益具有重要意义。 研究了水树枝存在引起的XLPE绝缘介电性能变化特别是非线性现象机理；利用Maxwell-Wagner与Maxwell-Wagner-Sillars极化理论分别建立了整体绝缘与水树老化区域的介电分析模型,并基于Ansoft搭建了含水树XLPE绝缘的有限元仿真模型。在这些模型基础上分析了组成水树的微孔形态与水树长度对XLPE绝缘介电常数、电导率、介质损耗角正切tanδ以及内部电场的影响。分析结果为水树老化给XLPE绝缘性能带来的变化与非线性特性的理解提供了科学依据,也为评估方法的发展奠定了基础理论支持。 在总结了国内外电缆绝缘诊断技术的基础上,详细研究了两种无损试验方法—等温松弛电流法与损耗电流谐波分量法在电缆老化评估方面的应用,介绍了两种方法的原理,同时分别建立了它们的分析模型,并基于实验范例与仿真分析研究了其中的特征参量与电缆水树老化间的关系,为这两种评估方法的开展提供了理论指导。 对修复液与水反应产物的介电性能提出了建议,配制了一种满足条件的硅氧烷修复液,设计了一套硅氧烷修复液的压力注入装置,并对装置的组成部件进行了详细介绍。利用修复液对现场退运的电缆展开了修复工作,深入分析了修复机理,结合常规试验、加速水树老化试验以及有限元电场仿真证明了硅氧烷修复液的注入能够有效延长电缆寿命。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM247
本文编号：2142150
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM247
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