Efficient naming of inspection photos of transmission line towers is vital in the maintenance of power grid equipment. Current inspection photo naming methods are mainly manual, which is neither rapid nor effective. Research on inspection photo naming is limited due to a shortage of inspection image datasets and low image resolution. Hence, we gathered inspection photos of real tangent towers using drones and created an inspection photo dataset TTower-345 for automatic naming model training purposes. We proposed an automatic naming model, IELC (improved EfficientNet network and LBP classification model), based on this dataset. IELC comprises a dual-branch structure that integrates a jointly improved EfficientNet model and an local binary patterns (LBP) classification model. Experimental results indicated that the proposed dataset contains more diverse inspection image features, which in turn helped the model learn more features. In our experiments, our proposed automatic naming method achieved a classification accuracy of over 95% and demonstrated reliability by exhibiting good generalisability in practical scenarios.

Current measurement technologies encompass a wide array of techniques, numbering over ten distinct methods. Among these, current sensors such as Rogowski coils and transformers based on Ampere’s law stand out. These sensors utilize electrical insulation between the primary and secondary windings, ensuring accurate and safe current measurement. In practical applications, current sensors play a critical role across various industries. They have become indispensable components in numerous devices, including inverters, DC/DC converters, motor controllers, uninterruptible power supplies, switch-mode power supplies, process control systems, and battery management systems. However, the high performance of these sensors often comes with increased costs, necessitating a thorough exploration of their notable advantages and inherent limitations. This paper aims to provide a detailed overview of the working principles and applications of various current sensors. By offering a clearer understanding of the different operating modes of these sensors and their respective strengths and limitations in practical applications, this paper seeks to furnish subsequent researchers with valuable insights for future investigations.

EVA树脂绝缘毯在配网带电作业中得到了广泛应用,其在高温高负荷条件下常出现热熔、机械损伤而导致绝缘失效.为了分析高温对EVA绝缘毯力学性能的影响,在不同温度下对EVA绝缘毯进行拉伸测试、差示扫描量热分析(DSC)、X射线衍射分析(XRD)及动态热机械分析(DMA),采用断裂伸长率、拉断力及储能模量等参数表征高温下EVA绝缘毯的力学性能与聚集态结构的变化.结果表明:随着温度的升高,EVA绝缘毯结构中的晶体类型不变,结晶度呈现上升趋势,主结晶区晶粒尺寸先减小后增大,相应的晶粒间距逐渐增大,致使EVA树脂绝缘毯的断裂伸长率呈现先增大后减小趋势,但其拉断力呈现下降趋势;在高温作用下,EVA绝缘毯的储能模量呈现下降趋势,表明EVA树脂绝缘毯在高温下回弹性能较差、刚性较弱,40℃是EVA树脂绝缘毯适宜的运行温度.

当前城镇、农村基础设施建设快速发展,用电负荷持续增大,低压业扩、抢修工作需求旺盛,低压带电作业工作量呈逐年增长趋势.相较于10 kV配电网不停电作业完整的组织保障体系和作业技术规范,低压带电作业在组织体系建设、安全教育、技能训练等方面尚存在明显不足.特别是在低压电网存在光伏等有源电网接入,"小""散"作业主要由供电所组织、外包施工单位具体实施的情况下,作业人员安全技能水平良莠不齐、安全意识淡薄和安全知识欠缺是低压带电作业面临的最大挑战.

The Ground inspection robot is a robot used for the maintenance of UHV overhead transmission line. It has the characteristics of high efficiency, safety, and reliability, and can independently complete the repair task of ground wires. However, there are strong electromagnetic interference in the working environment of the ground wire repair robot, which will seriously affect the operation and maintenance effectiveness of the robot. Therefore, the electromagnetic protection of the grounding wire repair robot was studied and discussed. The electromagnetic environment characteristics of the grounding wire repair robot are diverse, mainly including a variety of interference sources such as high-voltage DC transmission lines, AC power supplies, signal transmission lines, mechanical equipment, and so on. This article summarizes electromagnetic interference sources and interference paths, arc discharge characteristics, analysis methods of induced arc discharge interference, conducted interference, and cable coupling analysis. A series of electromagnetic protection measures need to be taken to solve the electromagnetic protection problem of the grounding wire repair robot. Firstly, shielding measures can be applied to the electronic equipment of the robot, including metal shielding, electromagnetic shielding, cable shielding, and so on. Secondly, grounding measures can be taken, including good grounding and anti-static measures. In addition, isolation measures can also be adopted, including power isolation, signal isolation, etc., to reduce electromagnetic interference. In summary, the electromagnetic protection problem of the grounding wire repair robot is a complex issue that needs to be studied and discussed from the perspectives of electromagnetic environment characteristics, electromagnetic interference sources and interference paths, arc discharge characteristics, analysis methods of induced arc discharge interference, conducted interference, and cable coupling analysis. Only by taking scientific electromagnetic protection measures can the normal operation and maintenance effect of the grounding wire repair robot be guaranteed.

10 kV架空导线主要架设在道路两侧等人员车辆密集场所,对地距离有限,易遭受大型施工机械误碰、树木压覆以及雷击等事故,引发导线损伤、断股等故障.根据10 kV架空裸导线因外力破坏造成的线径损伤,结合现有新工具、新材料和新工艺,提出一种不停电剪断重接架空裸导线的方法,保证修复后导线的机械强度、电气性能均符合运行标准要求,且修补过程线路用户用电不受影响.

In order to study the flashover characteristics and moisture-proof mechanism of hard superhydrophobic coatings under different humidity and different gap distances, hard superhydrophobic coating were used as test group, RTV coating and uncoated as control group. These coatings were applied to epoxy resin plate, and power frequency surface discharge tests were carried out under different humidity and gap distance respectively. The test results show that the surface flashover voltage of hard superhydrophobic coating decreases by 5.1 % under the relative humidity of 80 % ~ 95 %, which is higher than that of the control group by 2 % and 5.3 %; Under the condition of 3cm ~ 9cm gap distance, the surface flashover voltage increased by 117.8 %, which is higher than that of the control group by 22.2 % and 20.9 %. Superhydrophobic coating can effectively improve the insulation performance of epoxy resin materials under high humidity, and ensure the insulation safety of distribution network live working under high humidity.

在遭遇强风、冰雪等恶劣天气时,输电线路很容易发生互相鞭击、碰撞、振荡等问题.为解决上述问题,研究一种基于DSP的输电线路四分裂间隔棒安装检修机器人自动巡检技术.利用蚁群算法求取满足机器人航行路径的总代价目标的巡视路径,基于DSP设计输电线路四分裂间隔棒安装检修机器人控制模块并求取控制变量,以此控制机器人运动.当机器人运动到目标位置时,从不同角度拍摄四分裂间隔棒图像并实行故障检测,得出四分裂间隔棒故障类型,完成安装检修机器人自动巡检.结果表明:所研究技术应用下,2号四分裂间隔棒存在销钉突出的故障,7号四分裂间隔棒存在支撑架断裂的故障,其余四分裂间隔棒均为正常,证明了该方法的有效性.

Based on the structural characteristics of multi-circuit transmission lines on the same tower and the typical failures of wire breakage, this paper proposes a wire repair robot system design, which mainly includes the design of the walking mechanism, the wire breakage sorting robot design, and the pre-twisted wire repair robot design. The traveling mechanism adopts the design of V-shaped wheel and equipotential ring to ensure the obstacle crossing function and equipotential connection. Wire repair adopts a dual-robot online operation method. After the arranging robot compresses the loose strand wires, the pre-twisted wire installation robot is used for pre-twisted wire repair. This program can provide a reference for the research and development of related products.

In order to solve the maintenance of the four-split spacer, a robot is designed in this paper, which includes a robot walking system, a work head for removing the spacer gripper pin, a work head for the spacer gripper pin replacement, and a multi-free working platform. According to the typical defects of the spacer, the robot's function is designed and the maintenance process is proposed. Combined with the on-line method, the electric field distribution on the robot in the process of entering equipotential is obtained by simulation and analysis. According to the characteristics of electromagnetic environment, the protection design strategy of the robot is proposed, which provides support for the development of the four-split spacer live working robot.

With the development of technology, advanced equipment with high-precision electronic equipment such as intelligent robots is increasingly used in live work. In live work of AC system, the continuous arc discharge generated by the floating potential conductor near the charged body is shown as a continuous high-frequency electromagnetic pulse. Although it has little impact on workers wearing shielding suits, it will cause obvious electromagnetic interference to precision electronic equipment. This paper analyzes the principles of arc discharge in floating conductors. Then taking the on-line process of a 500kV line live working robot as an example, an electromagnetic transient simulation model is established and the arc current is calculated and analyzed. The results show that the starting discharge position of the robot on-line process is about 10cm away from the wire, the arc current is a periodically spaced pulse waveform, a single pulse is a gradually decayed oscillating waveform, the wave head time is within 100ns, and the oscillation duration is around 1$\mu$s. As the discharge distance decreases, the energy of a single pulse decreases, but the pulse density increases, and the total average power increases. The calculation results can provide a reference for the electromagnetic protection of electronic equipment for live working in AC power transmission systems.

The rapid development of mobile communication technology has given birth to the shared tower mode of installing base station equipment on transmission towers, but the radio frequency(RF) radiation faced by the shared tower operators is not clear and the safe gap distances for live working need to be redetermined. Two aspects of research were taken to solve the two problems existing in operation and maintenance on 110kV shared towers. First, the method of field measurement was used to measure the RF electromagnetic field intensity around the tower. The RF electromagnetic field distribution characteristics were obtained. The field division rules were formulated in line with a related national standard, and the radiation protection measures that the operators need to take in different fields were clarified. Second, the switching impulse discharge tests were conducted on a simulated shared tower, and the safe gap distances for live working on shared towers were determined. The results show that the electromagnetic radiation level in the horizontal direction of the ground and that on the inner side of the main material of the tower are relatively weak, while that outside the main material of the tower is strong, up to 154.6V/m; the minimum working distance between the equipotential worker and the side tower frame and that between the worker and the lower cross arm are 1.3m and 1.4m, respectively; the minimum combined gaps that should be met with the side tower frame and the lower cross arm when the worker enters or exits the equipotential are both 1.5m. The research results can provide basis and guidance for safe operation and maintenance on 110kV shared towers.

交跨距离是输电线路与被跨越物之间的最小距离,关系到线路的运行安全,必须符合检验规范的要求.针对现有交跨距离检测方式存在的不足,设计了激光雷达交跨距离自动检测系统,阐述了系统的工作原理与组成,并介绍了参数优选、检测数据的预处理方法及无线通讯的双链路设计.样机验证结果显示,该自动检测系统的准确度、实时性及各项功能均达到了设计要求.

基于输电线路施工作业中有关导线几何测量、传送物件等方面的需求,提出了一种单履带式导线行走机器人的总体方案,并给出了行走驱动部分的结构设计与传动链的计算方法.通过功能样机的制作与试验表明,该行走机器人结构紧凑,操作便捷,并具有较高的工作效率,可在导线上进行需要较大牵引力与附着能力的作业.

With the rapid development of China's economy and the acceleration of the pace of urbanization, across the highway, power lines, railways, etc., have become the main factor to restrict the construction of transmission line channels. In order to ensure the construction safety of the power line, to create more economic and social benefits for the power enterprises, the electric power line has become a key concern in the construction process of the current power line. In this paper, takes Jinhua Thermal Power Plant as the research object, the paper analyzes some of the problems, and discusses the related problems in the construction of electric power lines, in order to provide a reference for future work.

施工现场的安全文明标化是浙江电网建设标准化管理工作中的一项重要内容,近年来国家电网公司推出了资源节约型、环境友好型的施工理念,在实际的电网施工中,推出了"掏挖式基础"的基础结构模式,适应山区的地形地貌,减少因大面积的施工导致的植被破坏、山体破坏的情况。