现阶段,在主网架供电方面,由于架空线路常年暴露在外,金具锈蚀问题逐渐凸显,接头的检查和更换频率需要不断加大.接头作为线路的关键组成部分,其安全和稳定性不容忽视.然而,由于时代进步和线路改迁等因素,同一条线路上出现了多种不同型号、打开方式不同的接头,这给用电安全带来了挑战.为提高用电安全性和可靠性,本文针对新型电网大吨位高强度Y型转接头的设计与应用进行了研究,提供了一种创新的解决方案.该接头具有多功能、高强度、可靠性强的特点,能够满足各种不同型号的需求,并且作业过程更加方便简洁,减少人员体能流失和工具掉落的风险.这对于提高电网运行效率、确保电网安全具有重要的意义.

阐述特高压直流输电线路工器具对于电网的安全运行有着至关重要的作用,结合实际的案例与行业内的应用现状,探讨±800kV特高压直流输电线路工器具的设计.

金属的腐蚀防护有机涂层逐渐向更加环保的水性化发展趋势,改性丙烯酸基水性防腐蚀涂料具有耐腐蚀、耐老化、耐化学介质等特点,在防腐蚀涂料领域有着较为广泛的应用.从高分子链结构和引入新材料复合改性乳液两个角度较为系统地综述了水性丙烯酸树脂改性方法及机理,并简要介绍了改性水性丙烯酸防腐蚀涂料的应用进展.

The Al2O3-13 wt.% TiO2 (AT13) composite coatings were prepared on Q235 steel by plasma spray technique. The spray parameters were designed by the orthogonal experiments, and the properties of the coating were evaluated. Results showed that with respect to the bond strength of the coating, the optimized spraying parameters were the plasma current of 530 A, Ar flow of 41 L/min, H2 flow of 10 L/min, and spray standoff distance of 100 mm. The plasma spray process led to the transition of α-Al2O3 to γ-Al2O3, resulting in the increase in the porosity of AT13 coating prepared at nonoptimized parameters. Meanwhile, the porosity and cracks were also increased due to the decrease in the Ar flow and the increase in spray standoff distance. The low porosity, a few cracks, and the uniformly dispersed TiO2 particles contributed the enhanced properties including mechanical and corrosion behaviors of the AT13 coating prepared at optimized parameters. The bond strength, microhardness, and thermal shock resistance of the AT13 coating could reach 25.01 MPa, 1000.6 HV0.5, and 40 times when the coating was prepared at optimized parameters, respectively. Especially, the static Icorr of the AT13 coating prepared at optimized parameters was two order of magnitude less than that of Q235 steel. In addition, the erosion weight loss of Q235 steel could be decreased about 30 times by the protection of the AT13 coating.

目的 为延长如输电塔架等金属构件的服役期限,制备一种湿固化型石墨烯改性重防腐涂料,并测试表征和分析漆膜的防腐性能和作用机制.方法 以湿气固化型聚氨酯树脂为主要成膜物,铝鳞片代替传统锌粉为主要防腐填料,石墨烯为改性剂搭配形成复合导电填料体系,借助定位排列剂等助剂制备了湿固化型石墨烯改性重防腐涂料.通过沉降测试、结合强度测试、水接触角测试、电化学测试、扫描电镜(SEM)分析、耐中性盐雾实验等手段,对涂层的常规理化性能、防腐蚀性能及微观形貌进行了表征分析,并探讨了石墨烯-铝鳞片复合填料防护体系的防腐蚀作用机理.结果 定位剂有助于提高涂料的分散性和稳定性,经过石墨烯改性后,重防腐涂层的结合强度、耐盐水性、耐候性等常规理化性能明显提升,固含超过70％,达到高固含的环保要求;水接触角增至115°,涂层疏水性有效改善;中性耐盐雾试验进行1000 h时涂层划痕处有明显的腐蚀迹象,但表面未发生起泡、剥落等缺陷,单边扩蚀小于2 mm,石墨烯质量分数为0.8％的涂层性能达到最佳,耐盐雾时间达5000 h以上,此时涂层湿结合强度仍达到8.3 MPa,电化学腐蚀速率仅为0.011673 mm/a,耐腐蚀性能优异.结论 石墨烯-铝鳞片复合防护体系的力学性能、机械封闭和阴极保护功能优异,属于一种底面合一的涂料,适用于湿热工业-海洋大气环境的腐蚀防护工作.

比热容是材料热性质的重要物理量.石墨基柔性接地体作为一种新型的接地体材料,其比热容的大小决定了材料在电流作用下的温升情况.研究测定石墨基柔性接地材料的比热容,对进行材料热稳定计算具有重要意义.采用差式扫描量热法(DSC)进行石墨基柔性接地材料的比热容测定,得到了石墨基柔性接地材料的比热容曲线.进行材料温升(热稳定)计算时,可根据环境温度和材料允许的最高温度,对比热容曲线进行积分,最终可以得到在此温度区间的等效比热容.

The paint films were prepared by different combination with which include five kinds of primer and six kinds of topcoat in this paper. The changes of mass, color, gloss, adhesion and hardness were measured after heat treatment at 180 ℃, and the thermal stability of the paint films of different primer and topcoat were analyzed. The result showed that the film of epoxy zinc-rich primer with fluorocarbon topcoat have the lowest quality loss rate of 3.26 %, and the adhesion and hardness of paint film can be improved by heat treatment. In conclusion, the paint films of epoxy cloud iron primer with polyurethane (PU) topcoat and epoxy zinc-rich primer with fluorocarbon topcoat have the higher thermal stability.

接地是输电线路防止雷击跳闸的主要措施之一,接地装置的接地性能直接受到所处环境的强烈影响,接地技术的研究涉及到地质、土壤、化学、材料、电气等多个学科.在均匀土壤中,水平接地网的接地电阻与接地系统所处土壤电阻率成正比,与地网面积的平方根成反比,但是在复杂土壤中,难以套用现有计算公式.南方地区地形复杂,大多数输电线路位于山区,地表上层为石英岩风化砂,下层为岩石,土壤分层现象比较显著,且石英岩风化砂通透性良好,保水保肥能力较差.南方地区的特殊地质对输电线路防雷接地的选型和设计带来一定影响.测量了南方一些具有代表性地区的土壤电阻率,得到了土壤电阻率分层情况,在此基础上比较了几种接地材料在一定长度内接地电阻的变化情况,为南方地区输电线路接地装置的材料选型和设计提供参考.结果表明:在南方的地质条件下,采用柔性石墨基接地带具有防腐能力强和可解决开挖受限难点的优势,应优先采用.

为防止电力电缆在生产及安装时由于机械牵引力过大而导致电缆变形,设计了一套电力电缆拉力测量仪.首先由力转换装置把牵引力转换成压力,然后电阻应变式称重传感器将该压力转换成电信号,再经过A/D模块进行采样,最后由单片机对数据进行处理,数据会被实时地保存在EEPROM中,并提供RS485通信和USB通信接口,可将数据传给PC机.通过加载试验、滤波和数据拟合确定了称重传感器输出信号与机械牵引力之间的分段式线性关系,对传感器进行标定.当机械牵引力在0 ～10 000 N内,最大测量误差为3.7％,平均误差约1.9％;当机械牵引力超过阈值时,仪器能够及时发出声光警报.

A self-adaption ant colony algorithm is proposed to solve the problems. In the self-adap-tion algorithm, state transition strategy combining deterministic selection with random selection is put for-ward, and a new rule is raised to update pheromone, the intensity of pheromone Q and volatile factor ρare adjusted adaptively which can improve the global searching ability and convergence of the ant colony algorithm effectively. The result of testing on Garver 6-bus and IEEE 18-bus system proved the feasibility and validity of the method. Moreover, in order to solve the problem of the operation difficulty on high voltage transmission tower, on the basic of present situation of related on-line operation of ± 800 kV HVDC transmission line, this paper designed a structure of special multi-function flexible ladder, and the related pilot test, experiment and the field trial had been carried out.

500kV及以上电压等级输电线路的耐张、直线塔近60％塔位的架空地线金具普遍采用双联串连接,绝缘子以玻璃和合成绝缘子居多,覆冰或其他原因造成绝缘子自爆或合成绝缘子断串时未得到及处理,发生雷击后易造成线路跳闸、掉线等风险较高.目前直线塔采用钢丝绳及双钩,而耐张塔则用钢丝绳、链条葫芦和紧线器,该组装方式操作流程繁琐,作业空间小作业人员较疲劳,耗时1～2h,效率低且有掉线、断线风险.本文将阐释更换架空地线金具、绝缘子新型技术的相关内容以及在实际生产中的应用.

500kV交直流输电线路拉线塔的拉线在运行过程中受外力破坏、运行气候环境等影响，当拉线出现张力松弛、断股、金具锈蚀等现象影响线路运行时需更换可调整。但目前需通常采用线路带（停）电方式进行，一般更换或调整一根拉线需用时8~9h，投入人员10~20人，作业方法或步骤相当繁琐，这种方式往往会增加带（停）电检修的作业时间，工作效率低，造成电力资源浪费。本文将研究阐释500kV拉线铁塔拉线棒下把螺帽拆卸方法的相关内容以及采用新型套筒扳手在实际生产的应用。

This chapter will build electromechanical transient model based on equivalent power method, by discussion and research on coordinates and control System, using block modeling, and achieve it in PSD-FDS by C++.

目前500kV输电线路上挂网运行的安健环标志牌(含塔号牌、警示牌及相序(极性)牌)材质主要以搪瓷和铝合金两种,通常安装方式采用螺栓固定,造成标志牌表面无机玻璃质材料掉落,运行过程中因雨水、外力作用等诱因条件,导致各类标志牌固定部位铁皮锈蚀,引起脱落或丢失,失去安健环标志牌应有的警示功能,存在安全风险较大."相框架"固定式结构综合考虑了传统安装方式的各项优缺点,从根本上解决了实际生产过程中安健环塔号牌锈蚀的问题,本文将对这种新型的"相框架"固定式结构安装方式进行研究.