高导热绝缘尼龙复合材料的制备和性能

以尼龙6 (PA6)为基体,采用两种不同粒径的氧化铝(Al203)按1∶1混合后,再与高导热填料氮化铝(AlN)复配成导热填料,采用熔融挤出法制备PA6/Al20JAlN导热绝缘复合材料.研究了复配填料含量为60％时,复配填料中AlN含量对复合材料力学性能、导热性能和结晶性能的影响.采用扫描电子显微镜(SEM)对复合材料的微观形貌进行了表征.结果表明,复合材料的热导率随着复配填料中AlN含量的增加而增大.复合材料的拉伸强度和弯曲强度随复配填料中AlN含量的增加先增大再减小,AlN含量占复配填料的50％时,复合材料拉伸强度和弯曲强度分别达到最大值83.09 MPa和137.14MPa.复合材料的结晶度和熔融温度没有显著变化.扫描电镜显示填料与基体的相容性较好.     

核电厂1E级干式变压器热寿命评定方法研究

本文介绍了现行标准对干式变压器热评定试验的要求,对国内部分厂家核级鉴定试验过程中变压器绝缘结构热寿命评定试验的案例进行了举例和解析,提出了干式变压器热评定试验的流程。     

An instrument for insulation conditions detection of roof insulator on high-speed-train

With the rapid development of high-speed-railway, environment around high voltage device on train roof becomes very complicated. Most train accidents happened due to occurrence of flashover on roof insulator, but the insulation condition estimation of insulator in such environment is much difficult. To ensure the insulation property of electric equipment, and guarantee the operation safety of high-speed-train, here established an instrument with high reliability which can on-line monitor insulation condition of roof insulator and give out advanced alarm before the incipient insulator flashover. The instrument consists of three parts, Data Acquisition & Sensor, Data Processing and Back Processing. Anti-interference and protection methods are processed to Rogowski coil sensor for better leakage current signal. To avoid the fluctuation from railway power supply, four modules are set to filter the power supply waveform. Through laboratory measurement, it is shown that the leakage current and the impedance angle can be detected by the instrument accurately. From the comparison of leakage current and impedance angle results under different moisture condition and the alarm operation when leakage current value reached threshold, this instrument can give out enough information for staff to understand the insulation condition of insulator.     

HVDC工程用交流电容器组内部绝缘配合的研究

根据超高压直流输电系统的特点和系统绝缘配合的要求,分析了HVDC工程用交流电容器组内部的绝缘配合问题,给出了单台电容器的绝缘水平、层间绝缘水平和对地绝缘水平的计算方法和选取原则。     

深水“一体化”保温测试液体系研究与性能评价

针对国内深水单层隔水管柱测试作业具有隔热性差、上部隔水管环空与下部油套环空连通会影响测试性和传压性等特点,研制了由合成多元醇与还原糖醇复配而成的低导热系数非水基液"一体化"保温测试液。并对该保温测试液进行了导热性、密度可调性、可泵性、流变性等性能的评价,实验结果表明,该测试液抗温可达150℃,导热系数为0.2428~0.2866 W/（m·K））,密度能在1.05~1.50 g/cm3或者1.50~1.05 g/cm3间由低到高或由高到低调节,150℃静止15 d的沉降降因子为0.50,25℃下表观黏度不大于70 mPa·s,4℃下静切力不大于3 Pa,具有较好的传压性,150℃下的3 d平均腐蚀速率为0.0369~0.0690 mm/a,岩心渗透率恢复值达95%以上;另外该保温测试液不仅环境友好,含油量为零,能满足GB 18420.1-2009《海洋石油勘探开发污染物生物毒性第1部分:分级》标准中一级海域使用要求,而且还可回收再利用,可大大节约测试成本。可以用于深水单层隔水管测试作业。      

Simple preparation method of asphalt polyurethane foam for various insulating purposes

In this study, Asphalt PUF (asphalt polyurethane foam) was simply prepared from the point of view of industry by in-situ polymerization of a polyoxyalkylene polyol (caster oil) and an organic isocyanate 4,4′diphenyl methane diisocyanate (MDI) into asphalt emulsion media at different NCO/OH index starting from (0.8 to 1.6). The chemical reaction is confirmed by FTIR. Surface morphology is scanned with SEM. Some of selected physical tests were performed for different insulating purposes; such as sound absorption, vibration damping, thermal conductivity, thermal cycling and water absorptivity%. The results approved that the prepared foams have an excellent sound and vibration damping properties. Furthermore, they can easily fit the uneven surface because of their good shape retention. Hence, it seems to be suitable especially for engine compartment as sound and vibration insulator. In addition, the water resistance properties of these foams are important for applications requiring long-term exposure to water, such as sealant, coating and membranes for landfills, tanks and pipes.     

色谱分析在变压器故障诊断中的应用和探讨

对变压器油色谱分析中出现的一些问题进行了分析,并对其处理方法进行了探讨。     

特高压1000kV变压器绝缘研究

介绍了特高压1000kV变压器绝缘研究概况,给出了不同情况下变压器主要部位绝缘结构电场的分布情况和分析方法。     

绝缘局部放电检测的自适应数字滤波技术

在绝缘局部放电（ＰＤ）检测中,抑制干扰历来是一个非常重要的问题。为抑制干扰,提高信噪比,提出了采样数据的自适应滤波方法,将其运用于模拟和实际采样信号分析时,成功地在强噪声干扰环境下分辨出了弱的局部放电信号。     

变压器绕组纵绝缘强度分析方法

提出了连续式、纠结式和内屏蔽结构变压器绕组纵绝缘强度的分析方法,对特高压暂态过电压（ＶＦＴＯ）下变压器绕组纵绝缘强度分析进行了探讨。