广东地区特殊污秽对外绝缘放电及污闪的影响研究

发布时间：2018-01-08 23:06

本文关键词：广东地区特殊污秽对外绝缘放电及污闪的影响研究　出处：《华南理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：本文针对广东地区在晴朗天气发生放电、清洁地区发生污闪等异常放电和污闪事故,提出在目前用等值盐密和灰密来表征高压绝缘子表面染污程度的基础上应进行污秽成分分析,研究特殊污秽成分对外绝缘放电和污闪特性的影响,以针对性提出抑制措施。针对目前国内外对于绝缘子表面污秽成分分析方法未能形成完整的体系,本文基于绝缘子表面污秽开展其成分分析的方法论研究。通过分析绝缘子表面污秽特征,综合筛选各种化学成分分析,开展了污秽成分分析技术和方法研究,形成了一套完整的污秽成分分析流程,在进行常规等值盐密和灰密测量的同时,进行污秽成分分析,以作为现有绝缘子表面染污程度表征方法的补充,为外绝缘前期的设计、基建和运行后的维护管理提供一定的参考。本文针对500kV港城变电站特殊放电事故,通过盐密、灰密测量,污秽成分分析,并结合当地的气候、环境、土壤特征,分析确定影响外绝缘特殊放电的特殊污秽成分为磷酸铝和葡萄糖,并在人工污秽试验中加入磷酸铝和葡萄糖进行单片绝缘子放电和污闪试验,复现了特殊放电现象,验证污秽成分分析的正确性,解释了导致特殊放电的原因,研究了含糖污秽和磷酸铝污秽对绝缘子起晕电压和闪络电压的影响。通过分析特殊污秽磷酸铝和葡萄糖的共有特征——吸湿性,本文基于平板模型试验研究了不同吸湿性污秽对外绝缘放电和污闪特性的影响,并辅以高速摄影仪记录放电和闪络过程,证明了吸湿性污秽在较低湿度下可显著降低污闪电压;湿度越高,吸湿性污秽对污闪电压的降低作用影响越小;而在饱和湿度下,不同吸湿特性的污秽不影响污闪电压,但是湿度越大,吸湿性污秽含量越高、吸湿性污秽的吸湿能力越强,放电越严重,闪络时的电弧越强烈,飘弧越严重。分析表明,这可能与放电和电弧与水分子的电解和空气的电离互相加剧有关。
[Abstract]:According to the Guangdong region of discharge in the sunny weather, clean area pollution flashover accident and abnormal discharge and pollution, the use of ESDD and NSDD based characterization of high voltage insulator pollution level to be made on the pollution component analysis, research into effect of special pollution external insulation discharge and flashover performance. In order to put forward the control measures. At present at home and abroad for insulators component analysis failed to form a complete system of research methodology to analyze its composition to carry out the surface of the insulator based on this paper. Through the analysis of insulator contamination characteristics, chemical composition analysis of comprehensive screening of all kinds of research methods, technology and analysis of the pollution components formed a complete set of pollution composition analysis process in conventional ESDD and NSDD measurement at the same time, pollution by component analysis. As a supplement to the existing pollution level of insulator surface characterization method for external insulation, preliminary design, construction and operation maintenance management to provide some reference. This paper 500kV Gangcheng substation special discharge accident, through the salt density, ash density measurement, pollution component analysis, combined with the local climate, environment, soil characteristics, analysis of the special the special component of pollution discharge to determine the influence of the external insulation of aluminum phosphate and glucose, and insulator discharge and pollution flashover test with monolithic aluminum phosphate and glucose in the artificial pollution test, resembles the special discharge phenomenon, the correctness of the analysis component of pollution, explains the reasons of the special discharge, studied the effect of sugar and filth aluminum phosphate pollution flashover voltage and corona voltage of insulator. By analyzing the special pollution of aluminum phosphate and glucose has characteristics of moisture absorption, based on the flat Effect of plate model was studied with different moisture contamination and pollution flashover characteristics of external insulation discharge, supplemented by high speed camera is used to record the discharge and flashover process, proved that the hygroscopicity can significantly reduce the pollution flashover voltage at low humidity; the higher humidity, moisture contamination on the pollution flashover voltage to reduce the effect of the smaller; while in saturated humidity, moisture absorption characteristics of different contamination does not affect the flashover voltage, but more humidity, moisture contamination content is higher, the ability of absorption moisture contamination is stronger, the more serious the flashover arc discharge, the more intense, float more serious. Analysis shows that this may ionization and discharge and arc and water molecules and electrolytic air each other exacerbate the.

【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM216

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