变电站综自系统防雷技术的应用

分析变电站综自系统遭受雷击的形式和途径,提出综自系统防雷的措施,进行实施改造。     

石油库低压配电及控制系统防雷技术

分析了石油库(站)低压配电及控制系统现有防雷措施的不足以及系统遭受雷击损害的主要原因。在分析其损坏原因的基础上,提出了三级综合防雷的保护措施,对提高石油库(站)低压配电及控制系统的抗雷电能力、优化系统的防雷水平起到很好的作用。     

含山县风电场雷击风险及防护措施研究

以安徽省含山县风电场为研究对象,通过对风电场所处地理环境、雷电活动月分布特征的分析,研究了风电场遭受雷击的风险,并结合雷击对风电场的损害类型,提出了针对的综合性防雷措施,为类似风电场的防雷工作提供技术参考。     

安防监控系统防雷工程设计

安防监控系统的雷电防护问题具有较强的广泛性、综合性、复杂性。通过对某设计研究所生活区安防监控系统遭受雷击损害的主要原因进行分析,探讨了防雷方案的设计要点,为类似工程提供参考依据。     

10 kV配电网柱上开关雷击分析和防雷措施研究

配电网柱上开关设备极容易遭受雷击而出现故障, 如何提高其防雷性能对于提高供电可靠性具有重要意义。分析了配电网柱上开关设备遭受雷击的特点,阐述了雷击配电网柱上开关设备的机理及其对整个配电网的危害情况。提出了柱上开关设备防雷的技术措施。     

煤矿高压电网FIAT防雷系统的创新与实践

本文以河南崤函电力供应有限责任公司高压电网防雷装置为研究对象,重点从雷电预报与防雷知识宣传、雷击事故原因分析总结、防雷装置处理与完善、防雷装置检测等方面,对煤矿高压电网防雷方法进行研究和探讨,提出FIAT防雷系统的创新与实践,取得了良好的安全、经济、社会效益,在煤矿高压电网防雷方面具有良好的参考与应用价值。     

变电所防雷保护的探讨

分析了变电所遭受雷击的几种形式,对变电所防雷保护措施进行了详细探讨.同时,指出了防雷设计应注意的问题.     

户外变压器的防雷

1　前言在户外变压器的故障中 ,雷击损害占有相当的比例 ,特别是在雷区 ,因防雷措施不当或不完善 ,而造成的损害所占比例可达 85 % ,致使企业蒙受较大经济损失 ,同时不能确保企业安全用电。防雷工作是设备保护的一个重点和难点 ,完善的防雷措施 ,是保证变压器不受雷击的前提 ,是极其必要的。2　遭受雷击的具体例子我局曾发生一起户外变压器雷击事故 ,事故发生后 ,避雷器ＦＶ、变压器Ｔ、接地系统完好无损 ,高压开关ＱＦ未跳闸 ,但高压跌落开关ＦＵ、低压总开关箱则严重毁坏 ,这一现象很奇特。有些年长的同行说雷击现象见过无数 ,但这种情况…     

迂回策略防雷技术研究与应用

安装在外场铁塔上面的仪器设备容易遭受雷击,做好防雷设施至关重要。在忠于防雷标准规范基本要求的基础上,探索如何有效地改进防雷方法,提高防雷设施的防雷性能,降低仪器设备遭受雷击的概率。在分析总结大量雷击实例的基础上,从雷电脉冲频谱特性及电磁兼容原理入手深入分析雷击细节,寻找雷击诱因,基于导体分布电感电容参数能够减弱或者阻隔雷电脉冲的特性,提出了运用迂回策略改变设备设置点偏离泄流主通路,以分布电感阻隔作用调整分流,减少雷电流对设备的直接冲击的解决方案。针对已建系统的低工程成本防雷改造,提出了“短迂回策略”,对于新建系统提出了“长迂回策略”防雷解决方案,并都给出了具体的设计方法,改进了传统的防雷做法。经过近20年的实例统计分析,结果表明了迂回策略的防雷方法更加实用、有效,易于实施,与传统防雷方法相比,其效果更加显著。     

降低输电线雷电侵入波的仿真分析

煤矿输电线路易遭受雷击的主要原因是雷电活动的随机性和所处环境的复杂性,一般较难确定雷击故障类型,使得防雷措施针对性不强,无法对变电站以及架空线路进行有效保护。文章通过ATP-EMTP建立某煤矿35k V线路模型,对进线段雷电侵入波进行仿真研究,通过对比得出一种合理使用线路避雷器的方法。     

Lightning propagation through the Earth and its potential formethane ignitions in abandoned areas of underground coal mines

Strong circumstantial evidence suggests that lightning has initiated methane explosions in abandoned and sealed areas of underground coal mines. The US Mine Safety and Health Administration investigated several of these occurrences within recent years. The investigated explosions occurred at significant depths ranging from 500 to 1200 ft. Data from the National Lightning Detection Network indicate a definite correlation between the times and locations of the explosions with those of specific lightning strikes. This paper addresses the question, "Can lightning cause potential differences capable of igniting methane-and-air mixtures at overburden depths at which underground coal mining occurs?" A mine depth of 600 ft was selected for this initial study. Computer simulations were performed, with and without the presence of a metal-cased borehole extending from the surface to the mine level. CDEGS software from Safe Engineering Services & Technologies, Ltd. was used for the simulations     

重庆某10kV线路防雷问题分析及改造措施研究

重庆10kV回沙线在雷电活动频繁地区,雷害故障情况较为严重。通过对整条线路易受雷击点和配电变压器防雷保护进行现场调研,从地形对雷电的影响、杆塔高度过高使雷击闪络次数增加和配电变压器防雷存在的问题等方面分析了雷害事故多发的原因,并在此基础上提出了架设耦合地线、加装保护间隙、完善配电变压器保护等防雷措施,达到提高线路耐雷水平,确保配电线路供电可靠。     

架空线路感应雷过电压产生机理与计算方法

架空配电线路裸露在空气中,极易遭受雷击产生雷电过电压,导致线路保护装置跳闸甚至线路电气设备元件的损坏,从而造成供电中断,影响了广大用户的生产和生活。对配电网架空线路感应雷过电压产生机理进行了详细的探讨,提出静电感应分量是配电网线路感应雷过电压的主要构成部分。并研究了目前常见的计算雷击导线附近大地时架空线路感应雷过电压的HC/idalen模型,并通过仿真分析表明大地电导率对架空线路感应雷过电压有一定的影响。     

A production system for intelligent monitoring systems

Conventional monitoring systems use data-collection techniques to obtain sensor data about various aspects of hazardous workplaces such as coal mines and provide warnings. However, they are ill-equipped for making complex decisions involving large amounts of interrelated data. Laser/RPS, a C language-based object-oriented production system, is presented, and those programming system features that can be used to develop intelligent monitoring systems are described. Potential applications of this system to underground coal mine monitoring systems are discussed     

智能建筑配电系统的防雷电过电压保护

智能建筑配电系统遭受雷电过电压袭击时对微电子设备的正常运行造成严重干扰。介绍智能建筑应全方位防雷电过电压的思想和技术———即不仅要有完善的外部防雷措施,还要有可靠的内部防雷电电磁脉冲的措施,确保智能建筑各信息系统的微电子设备安全可靠运行。     

A Method for Estimating the Probability of Lightning Causing a Methane Ignition in an Underground Mine

During the past decade, several methane/air explosions in abandoned or sealed areas of underground coal mines have been attributed to lightning. Previously published work by the authors showed, through computer simulations, that currents from lightning could propagate down steel-cased boreholes and ignite explosive methane/air mixtures. The presented work expands on the model and describes a methodology based on IEEE Standard 1410-2004 to estimate the probability of an ignition. The methodology provides a means to better estimate the likelihood that an ignition could occur underground and, more importantly, allows the calculation of what-if scenarios to investigate the effectiveness of engineering controls to reduce the hazard. The computer software used for calculating fields and potentials is also verified by comparing computed results with an independently developed theoretical model of electromagnetic field propagation through a conductive medium.     

Transient Magnetic Fields and Current Distributions in an Electric Vehicle Caused by a Lightning Stroke

An electric vehicle has more electronic parts than a gasoline‐powered vehicle. Not only the control circuits but also the driving circuits of electric vehicles are electrical, in contrast to those of gasoline‐powered vehicles. This means that there is a higher possibility of malfunctions in an electric vehicle due to electromagnetic disturbances caused by a lightning stroke. Therefore, it is important to establish lightning protection methodologies for electric vehicles. To clear up with the mechanisms whereby the lightning current following through the vehicle body and some other parts causes the malfunctions, it is important to clarify the transient magnetic fields and current distributions in electric vehicles. In this paper, the transient magnetic fields and the current distributions in an electric vehicle are simulated by the FDTD method, and the probability of lightning damage is discussed.     

球罐类构筑物雷击风险评估方法

基于雷击风险评估规范GB/T 21714.2—2008的风险计算方法和GB 50057—2010关于雷击金属管壁热熔的计算理论,结合球罐类构筑物的特点和防雷设计,对球罐类构筑物雷击风险评估的方法进行了分析。研究结果表明,雷击热熔对于严格按照标准要求设计施工的球罐的损害在可控范围以内,但是对于偷工减料或因施工工艺的疏忽导致罐壁某个部位较为薄弱的球罐,其损害可能是致命的。     

配电变压器雷击建模及雷电防护

配电变压器(简称配变)作为配网的重要组成部分,绝缘水平低,易遭受雷电过电压的侵害,其安全运行对配电网稳定性及可靠性具有十分重要的意义。采用散射参数测量法,测量配变散射参数并经数据处理获得配变的阻抗幅频特性,经电路拟合构建了适用于雷击情况的配变宽频模型,并经基于模拟退火法的粒子群算法对等效电路参数进行优化,实测结果表明配变实际输出响应与文中宽频模型仿真结果吻合度较高。基于该宽频模型分析了冲击电晕对配变过电压传播的影响以及配变防雷保护措施,结果表明冲击电晕显著减小配变过电压幅值,配变低压侧加装避雷器对其防雷作用明显。