Intelligent Protection and Monitoring System of Lightning Disaster

Based on Internet technology,modern wireless communication technology and new sensor technology,an intelligent protection and monitoring system of lightning disaster was established to collect lightning current(lightning intensity,frequency and time),induced lightning current and leakage current of surge protector(SPD),earthing resistance,working voltage,temperature and humidity in the lightning environment and other data in real time.Through the online analysis of visual data and automatic alarm beyond the preset value of cloud platform,it can realize the intelligent online monitoring and management of lightning protection devices,providing scientific and reliable lightning protection technical support for lightning protection and disaster reduction,and ensuring the smooth development and efficient management of lightning protection safety work.

Influence of Lightning Disaster on Cities and Lightning Defense Measures

Under the influence of special terrain and climatic conditions,lightning weather in Ulanqab City is more frequent from June to August,and lightning disaster has become one of the important tasks of disaster prevention and mitigation.In this paper,based on the characteristics of lightning weather in Ulanqab City,the impact of lightning disaster on the city was analyzed,and lightning protection measures,such as strengthening supervision of lightning protection safety,establishing a long-term lightning protection mechanism,doing a good job in lightning protection construction and detection in key places,and further improving public awareness of lightning protection,were put forward to reduce and avoid urban lightning disasters as much as possible and ensure urban safety.

Study on the Causes of Rural Lightning Disaster and Countermeasures of Lightning Protection and Disaster Reduction

With the development of the time and the progress of economy,great changes have taken place in the environment.In recent years,it is common to see bad weather,such as hurricane,drought,lightning and so on.The emergence of these weather has the greatest impact on farmers and crops,especially the lightning weather,not only that,but also sometimes cause personal injury.In face of the frequent occurrence of bad weather in recent years and its harm and threat to China's agriculture,rural areas,personnel,etc.,the author makes a detailed study on the causes of rural lightning weather,analyzes the lightning protection measures in rural areas and their shortcomings,and summarizes the relevant improvement measures.

Statistical Assessment System of Thunder and Lightning Disaster in Yantai City

Starting from lightning disaster information and using computer technology, lightning disaster information is arranged and classified, thereby realizing automatic management of lightning disaster information.

Protection of ±500 kV HVDC Double-circuit Converter Station from Lightning Induced Overvoltage

In order to obtain reasonable schemes of arrester in converter stations, the arrester scheme of "Xiluodu-Guangdong HVDC ± 500 kV double circuit transmission" project against lighting induced overvoltage, which was designed according to the main principle of lightning protection in converter station, is discussed. A calculation of the lighting induced overvoltage in Zhaotong converter station un- der various operation modes is performed with ATP-EMTP software, then the surge arrester configuration of the converter station is decided, and the arrester protection schemes of smoothing reactor and neutral line are studied. It is concluded that additional protection is necessary because of the relatively large gap between protected disconnecting switch and arrester of metallic return transfer bus. Plus, the smoothing reactor (SR) arrester near the valve hall could be removed to improve the scheme’s economic performance.

Testing of Lightning Protective System of a Residential Structure： Comparison of Data Obtained in Rocket-triggered Lightning and Current Surge Generator Experiments

We present a comparison of data obtained during testing of lightning protective system of a residential structure in rocket-triggered lightning experiment at the International Center for Lightning Research and Testing(ICLRT)at Camp Blanding,Florida,and current surge generator experiment at Rzeszow University of Technology in Poland.Three different configurations of LPS were tested in Poland with the dc grounding resistances of the entire system 4.09 Ω(LPS 1a),1.65 Ω(LPS 1b),and 2.88 Ω(LPS 2).For LPS 1a with three ground rods the value of the peak current entering the electrical circuit neutral was about 56% of the injected current peak,and for LPS 1b with two additional ground rods and two 5 m long buried horizontal conductors it was about 16%.For LPS 2 with five ground rods interconnected by a buried loop conductor this ratio was 21%.The current waveshapes in the ground rods differed from the injected current waveshapes and the current waveshapes in other parts of the test system,especially,for poorer-grounding LPS 1a.The surge-generator results are consistent with those of triggered-lightning experiments at Camp Blanding,Florida(DeCarlo et al.,2008 [2]).

Study of Lightning Safety Distance Using Rolling Sphere Method

The development of a computer program for evaluation of lightning safety distance between the tower and satellite dish is written in M-File MATLAB. The 3-dimensional illustrative graphics model is used to capture better understanding on how lightning protection system (LPS) works. The study of physical length of grounding electrode used on the tower is found to be significantly affecting the grounding system performances where they depend on magnitude of dispersed lightning strikes current and the settling time for the current to completely disperse. The grounding system performance is studied by using lightning impulse current (LIC) generator, simulated in OrCad PSpice software. It is found that the optimum length of vertical lightning rod in LPS is the same with the striking distance. There is no significant improvement is observed in lightning safety distance if the length of vertical lightning rod is higher than striking distance. The lightning strike peak current that has larger magnitude than the withstanding insulation level of specified object causes no physical damage. It is because the lightning safety distance increases when the lightning strike peak current becomes higher. It is also found that the lower grounding impedance generates higher magnitude of dispersed peak current and faster settling time.

浩吉铁路接触网防雷系统改造方案

接触网是电气化铁路的主要组成部分,均为露天架设、无备用,面临各种恶劣的气候条件,特别是雷击影响尤为突出,轻则引起绝缘子闪络跳闸,影响列车正常行驶;重则引起接触网断线事故,造成列车停止运行。因此,接触网防雷是接触网建设、运营需要重点考虑的因素。文章从既有铁路现状、防雷措施、防雷改造、避雷线安装注意事项等方面提出了既有线路接触网防雷改造方案,并通过方案实施,判断方案的可行性,供相关人员参考。

气象标准约束力分析与评价研究——以雷电防御领域标准为例

发挥标准的技术支撑和基础性制度作用,标准约束力是关键,具有一定约束力的标准能够助推行业领域高质量发展。以雷电防御领域(X13)标准子体系为例,分析了标准的制度属性,评价了现行气象防雷标准的约束力。结果表明:气象防雷标准具有法律效力约束力、法律后果约束力、行政主导/干预约束力、市场机制约束力、契约约束力和自我约束力等6种约束力,简述了每种约束力的后果,指出了影响约束力的因素。研究结论可为气象防雷标准的应用、复审、修订以及标准体系规划提供参考。

化工园区雷电防护策略与应急管理探讨

化工园区作为高风险场所,经常受到雷电等自然灾害的影响,因此安全生产尤为重要。近年来,随着科技的不断发展,智能化、信息化技术在化工园区安全管理方面得到了广泛应用。文章围绕化工园区雷电防护策略与应急管理进行探讨,分析化工园区雷电预警与安全防护智能监管系统的工作原理及应用价值,提出应急管理措施,以提高化工园区的安全生产保障水平。

“工业上楼”建筑电气设计要点浅析

随着经济的发展,城市产业发展往往面临产业转型升级加速和土地资源紧张的双重压力,“工业上楼”举措成为了当今城市产业发展的趋势和研究方向。“工业上楼”面向的产业类型较多,不同产业类型对电气设计的需求也不同,因此“工业上楼”建筑电气设计也相对复杂,对电气设计也带来一定挑战。本文将针对“工业上楼”建筑电气设计关键要点进行探索,以供参考。

光伏组件雷电冲击损伤特性实验研究

采用高电压及大电流冲击模拟实验,对光伏组件雷击损伤特性进行了分析,获取了雷击对光伏组件的损伤形貌、雷电路径、损伤阈值、电学特性变化等关键损伤特征。研究结果表明:在自然界雷电情况下,多数为光伏边框或支架接闪,20 kA的雷电流即可引起边框烧蚀;雷击会影响组件的功能和寿命,随着雷电冲击电压的增大,最大输出功率逐渐减小,冲击电压为300 kV时,最大输出功率变化率达到10.02%。基于雷击损伤实验模拟结果,可以为光伏系统的雷击防护提供数据支撑和参考依据。

通信机房防雷接地保护研究

文章分析了雷电的形成及其对通信机房的危害,探讨通信机房防雷接地存在的隐患,并给出了解决隐患的可行性技术措施。通过介绍传统的防雷接地技术,提出防雷接地技术的创新发展方向,为通信机房的防雷接地保护提供有力的技术支持。

新型电力系统源网设备典型外部灾害防治挑战与展望

随着“双碳”目标的提出,构建风光新能源迅速发展的新型电力系统成为国家战略。目前,新型电力系统受覆冰、山火、雷击等外部灾害影响严重,新型电力系统外部灾害防治技术研究迫在眉睫。本文分析了几种典型新型电力系统外部灾害风险,探讨了特高压地线覆冰、特高压输电线路附近山火、配网雷击、风机覆冰与雷击、光伏防灾以及储能电池火灾几类新型电力系统外部灾害问题及相应灾害防治技术研究现状,展望了新型电力系统外部灾害防治技术未来发展趋势,以期为新型电力系统外部灾害防治提供研究思路。

大型国际航站楼异形双曲金属屋面系统施工研究

以杭州萧山国际机场三期项目新建T4航站楼为例,研究了超大面积异形双曲钢结构金属屋面系统、不锈钢天沟系统、天窗系统、不锈钢防坠落系统和防雷系统施工工艺及施工关键技术,提炼总结形成超大面积异形双曲金属屋面施工成套技术,实现了各系统的精准安装,为后续大型会议会展场馆和机场类超大型建筑金属屋面施工提供可借鉴经验。

基于气象数据深度挖掘的雷电灾害自动化监测系统设计

为提高雷电灾害的预防和应对能力,设计基于气象数据深度挖掘的雷电灾害自动化监测系统。通过360度雷电传感器获取当前环境中云闪、地闪电磁波脉冲频率与次数数据,利用定位模块获取雷电发生经纬度信息,将气象数据经过Oracle10数据库存储后,使用深度挖掘算法中的Clus⁃tream算法,建立雷电灾害自动化监测框架,将气象数据输入到该框架内,使用多机器学习单元对气象数据训练集进行学习,得到基分类器,通过该分类器挖掘气象数据内的雷电灾害监测结果,实现雷电灾害自动化监测。实验结果表明,该系统具备较强的云闪电磁波采集能力和监测雷电灾害能力,应用性强。

LNG接收站仪表防雷接地设计浅析

液化天然气(LNG)接收站是重要的能源基础建设,仪表系统的正常运行对安全生产至关重要,仪表防雷设计可以有效防止电子测量仪表以及控制系统遭受雷电威胁。通过分析仪表防雷设计的必要性、现场仪表及控制系统防雷接地的具体方法、关键原则以及发展趋势,为防雷接地提供设计思路。另外,通过举例分析现场常见的接地问题及处理对策为LNG接收站现场仪表防雷接地的检修维护提供一定参考。

基于IEC的防雷保护角法在屋顶光伏系统的应用

防雷保护角法作为IEC标准认可的接闪器定位三大方法之一,在国际上广泛应用于各种防雷设施上;分析保护角法的防护方法、防护范围,给出不大于2m的常用单根接闪器的保护角度,便于工程使用;指出建筑物屋顶太阳能光伏板的边框不适用于防直击雷的接闪器,并根据金属或电气装置与防雷装置间距大小,按有防雷间隔距离和防雷等电位两种措施给出保护角法对保护屋顶光伏板的具体做法;鉴于国内防雷规范不采用保护角法,提出重视和深入研究保护角法的建议。

高山广播电视无线发射台电力系统改造案例分析

安全播出是广播电视工作的生命线,电力保障系统是保障安全播出的基础。以文山电视调频骨干转播台电力系统优化改造为例,介绍如何结合高山台站实际情况进行电力系统改造,供业内人士参考。

智能配电网动态防雷系统设计与应用实践效果分析

针对智能配电网易出现雷击的问题,提出了一种智能配电网动态防雷系统设计方案。该系统主要由两部分构成。一部分为硬件模块,包括装置模块、天线模块、前端处理模块和信息处理模块,主要用于执行防雷电操作;另一部分为软件模块,包括软件程序和数据库,用于对硬件模块进行控制,以使整个防雷系统可以正常运行。通过系统测试分析可以发现,该系统性能良好,符合预期要求,可准确提升雷电故障检测率,有利于降低智能配电网的经济损失,最高可达9.865×10^(6)元/a,表明该系统具有良好的应用价值。