Correlation between geometrical parameters of electrical tree and corresponding partial discharge parameters in XLPE

This paper deals with the experimental study on the correlation between the geometrical parameters of electrical tree and corresponding partial discharge (PD) characteristic parameters in the course of electrical tree aging within cross linked polyethylene (XLPE) insulation. The electrical tree aging tests were performed on specimens removed from a section of 220 kV transmission cable. The PD macroscopic characteristic parameters were found to be significantly dependent on the corresponding geometrical parameters of electrical tree channels in the course of aging of XLPE, and different kind of electrical tree has different characteristics, and there is obvious correlation between the type of electrical tree and the pre-applied power-frequency stress. Beside, using regression analysis, the expression of the relation between them were obtained, and from which it can be seen that there is significant nonlinear correlation between geometrical parameters of electrical tree and corresponding PD characteristic parameters in the course of aging of XLPE. Therefore, the aging degree of XLPE can be effectively evaluated by recognizing the changing regularity of the PD rnacroscopic characteristic parameters.     

Effect of addition of poly（ethylene glycol） on electrical conductivity of poly（3,4-ethylenedioxythiophene）-poly（styrenesulfonate） hybrid

By mixing various concentrations of poly (ethylene glycol), a series of poly(3,4-ethylenedioxythiophene)-poly(styeenesuffonate) composite thin films were prepared.The electrical conductivity of the PEDOT-PSS/PEG thin films was measured by the four-pcobe method. Experimental results showed that the inclusion of poly(ethylene glycol) influenced the electrical conductivity of PEDOT-PSS film significantly. With the increase of PEG concentrations, the electrical conductivity sharply increased to reach a maximum and then slowly decreased down. Furthermore, the PEG molecular weight and environment temperature also played important roles on the electrical conductivity of PEDOT-PSS/PEG thin films. A good linear relationship was found between in σDC and T^-1/2 within the entire temperature range detected.     

线性低密度聚乙烯涂层修饰ZnO亚微米棒膜的疏水性研究

采用低温水热法制备出ZnO亚微米棒薄膜, 经线性低密度聚乙烯涂层修饰后显示出超疏水性, 静态接触角为151.2° ± 2.3°, 滚动角为4°. ZnO亚微米棒膜的微结构和低表面能材料线性低密度聚乙烯涂层修饰是其显示超疏水性的原因, 并用Cassie理论对膜的润湿性进行了分析.     

UNIPOL工艺聚乙烯装置粉体静电隐患分析

主要对文献[1]中UNIPOL工艺聚乙烯装置粉体静电隐患进行分析,并提出相应防范措施.     

淀粉/聚乙烯复合材料各组份对聚乙烯降解的影响研究

研究了含有不同助剂的淀粉／聚乙烯复合材料在曝晒下的降解行为，结果表明，羟基化合物与淀粉具有正协同作用，喧种正协同作用能使聚乙烯迅速降解，而羟酸类化合物与淀粉则具有负协同作用，这种负协同作用能使降解速度减缓。     

聚乙烯燃气管道系统的质量控制

本文简述了聚乙烯燃气管道系统的质量要求,沿着物流和时间方向,严格执行原料、元件制造、设计安装各个组成部分自身的和物流传递过程中的质量控制,拟建立一个以保证系统安全运行为中心的质量体系,逐步形成系统的质量控制链,推动我国城市燃气管网的健康发展。     

聚乙烯丙纶双层双面复合防水卷材在屋面防水工程中的施工工艺

介绍新型防水材料聚乙烯丙纶双层双面复合防水卷材的结构特点、技术性能及施工方法和施工中的注意事项,并对其作出效益分析.     

N-芳基-2-苯基二氮亚烯甲酰胺的固态合成

本报道了一种有效的由Ｋ２Ｆｅ（ＣＮ）６固态氧化二芳基氨基脲类制芳基Ｎ－芳基－２－苯基二亚烯甲酰胺类化合物的新方法，此方法操作简便，条件温和，反应时间短且产率高。     

高导热聚乙烯长丝的结构与性能

为研究不同工艺生产的高导热聚乙烯长丝的微观结构与性能，选取超高分子量聚乙烯(UHMWPE)、凉感聚乙烯、普通聚乙烯，以及添加聚酰胺、聚丙烯的复合聚乙烯长丝，与改性导热功能长丝(凉感涤纶、凉感锦纶)及普通涤纶长丝进行对比，测试并分析长丝的微观结构、力学性能、热学性能、表面性能和导湿性能，并将长丝试样制备成针织物，测试其导热性能和瞬间接触凉感。结果表明：UHMWPE长丝的强力及模量最高，热稳定好，分解温度为凉感聚乙烯长丝的1.3倍、普通聚乙烯长丝的1.4倍，但导湿性最差；聚乙烯长丝的比热容大于改性导热功能长丝，其中普通聚乙烯长丝的比热容最大；凉感聚乙烯长丝的导湿性及润湿性最好，适用于凉感功能针织产品的加工，但是热稳定性较差。几种聚乙烯长丝针织物均具有良好的接触瞬间凉感和导热性能，且在聚乙烯熔体中加入凉感物质或其与聚酰胺、聚丙烯等物质共混纺丝可提高织物的导热系数和接触瞬间凉感。