延安地区配电网架空输电线路防雷方案研究

研究了延安供电公司配电网易受雷击架空输电线路防雷改造方案。通过加装线路避雷器前后耐雷水平计算和EMTP仿真研究,论证了延安地区配电网架空输电线路隔1塔装1组避雷器方案的防雷效果,证明该方案在10 kV线路上的应用效果良好,而在35 kV线路上的应用效果不佳。     

基于GIS平台对线路避雷器应用方案的研究

雷害是造成输电线路故障的主要原因.根据对110 kV及以上电压等级输电线路雷害事故发展过程的研究,使用线路避雷器将有效降低雷击跳闸率.介绍了基于GIS平台结合微地形情况的线路避雷器安装选点,提出了线路避雷器的应用方案,结合某220 kV架空输电线路进行实例分析,研究表明此方案直观、形象且易于对防雷措施进行管理,对实际防雷工程有参考价值.     

外串间隙线路型避雷器在架空输电线路中的防雷作用

针对阳江地区输电线路存在遭受严重雷击跳闸的问题,分析了各种雷击过电压引起的线路闪络跳闸,介绍了外串间隙线路型避雷器在输电线路中间防雷的机理,指出在阳江电网中应用外串间隙线路型避雷器解决架空输电线路中间防雷的必要性及避雷器的安装选点原则,可供同行参考。     

线路型金属氧化物避雷器10年运行分析

作为全国较早在110kV及以上架空输电线路应用线路型金属氧化物避雷器（MOA）的单位之一,自1997年初开始与清华大学合作进行理论研究,并在110kV珠西线作试验挂网运行到现在已整10年。总结了线路型金属氧化物避雷器10年来的运行情况,通过分析其防雷效果,进一步证实了线路型避雷器在提高架空输电线路耐雷水平,有效降低线路的雷击跳闸率方面的效果是明显的,同时提出应用及运行方面的经验及注意事项。     

±500 kV直流线路避雷器工程应用研究

雷击是影响±500 k V直流架空输电线路运行的重要因素,±500 k V直流线路避雷器的挂网试运行成功,为直流线路防雷改造提供了有效技术手段,但大规模的工程应用仍是空白。笔者结合±500 k V江城线直流线路避雷器安装项目,研究了±500 k V直流线路避雷器选型、选点原则,给出了不同塔型下直流线路避雷器的安装方案,并提出直线塔宜采用悬挂式安装方案,耐张塔宜采用地面支柱式安装方案。运行数据表明,笔者提出的±500 k V直流线路避雷器选型、选点原则防雷改造效果明显,安装方案达到线路安全运行要求,对±500 k V直流线路避雷器的推广应用和在运直流线路防雷改造工作具有重要的实践和借鉴意义。     

线路型金属氧化物避雷器1O年运行分析

作为全国较早在110kV及以上架空输电线路应用线路型金属氧化物避雷器 (MOA) 的单位之一,自1997年初开始与清华大学合作进行理论研究,并在110kV珠西线作试验挂网运行到现在已整10年.总结了线路型金属氧化物避雷器10年来的运行情况,通过分析其防雷效果,进一步证实了线路型避雷器在提高架空输电线路耐雷水平,有效降低线路的雷击跳闸率方面的效果是明显的,同时提出应用及运行方面的经验及注意事项.     

贵广直流肇庆换流站站用电源线路防雷改造方案及效果分析

在贵广直流肇庆换流站站用电源线路防雷改造中, 采取了电源线路复合绝缘子加片、增设耦合地线和加装线路避雷器等综合防雷改造方案。对各方案实施原则进行分析, 并对比改造后与往年的运行数据,证明了本方案确实具有一定的防雷效果, 为110 kV 高压架空输电线路防雷提供了一些经验。     

基于接地保护技术的110kV架空输电线路防雷设计策略分析

110 kV输电线路防雷设计是保障电力系统稳定运行的关键因素。输电线路防雷常用的接地保护技术包括架设避雷线、降低接地电阻、安装避雷器等。基于此,分析了110 kV架空输电线路防雷的设计必要性及影响输电线路稳定的因素,制定110 kV架空输电线路防雷接地保护设计策略。     

齐鲁石化电网综合防雷改造

结合齐鲁公司电网综合防雷改造,介绍了架空输电线路、变电站及直流系统的防雷措施,对加装线路避雷器后的防雷效果进行了评估。总结经验,对电网防雷具有借鉴意义。     

220kV断路器雷电侵入波过电压的仿真

对一起220kV架空输电线路雷击跳闸故障进行模拟还原,通过分析仿真结果可知,当线路遭受多重雷击时,雷击过电压可能直接作用于热备用状态的断路器上,进而导致断路器绝缘击穿,建议在架空输电线路出线侧加装避雷器以提高输电线路防雷水平。     

Effect of overhead ground wires on reduction of failure rates of surge arresters on power distribution lines

Surge arresters are sometimes damaged by lightning strokes with high energy, in spite of installation of conventional protection methods. In order to reduce the number of failures of surge arresters, we should consider another protection method, such as an increase in the withstand capability of surge arresters and installation of additional overhead ground wires. However, quantitative comparison of these methods for preventing damage to surge arresters against lightning strokes with high energy has never been performed. This paper describes the effects of additional overhead ground wires for preventing damage to surge arresters. The main results are: (1) The failure rate of surge arresters on a distribution line with two overhead ground wires is about one third of that with an overhead ground wire. (2) Installation of a second overhead ground wire six to eight spans from the end of a line reduces the failure rate of a surge arrester at the end as effectively as increasing the withstand capability by a factor of two. © 1998 Scripta Technica. Electr Eng Jpn, 122(2): 12–20, 1998     

配电线路避雷器雷电感应过电压防护研究

应用ATP-EMTP对配网架空线路雷电感应过电压下,线路避雷器的保护效果进行了仿真计算研究。仿真计算结果表明,安装线路避雷器可以对配网架空线路雷电感应过电压进行防护,其保护效果与避雷器的配置方式及线路杆塔接地电阻有关,降低杆塔接地电阻可以减小线路避雷器的安装密度。     

高压架空输电线路雷击过电压的仿真计算与分析研究之三:影响输电线路耐雷水平因素的仿真计算与分析

根据输电线路雷电过电压仿真计算模型,对影响输电线路耐雷水平因素进行仿真计算与分析,证明现有常规的防雷保护措施仍然实用有效。应根据现场实际,进行仔细地规划,因地制宜地选择适合的防雷保护措施,是可以起到应有的保护效果。     

Effect of lightning overvoltages on low-voltage power distribution lines due to direct lightning hits to overhead ground wire

Overhead ground wires and surge arresters have been installed to protect high-voltage power distribution lines and apparatus from overvoltages induced by nearby lightning strokes. The effects of surge arresters for protection of high-voltage distribution lines against direct lightning strokes have already been investigated using the digital simulation program EMTP (Electromagnetic Transients Program). With regard to the protection of low-voltage distribution lines from overvoltages induced by lightning strokes, experimental analyses using a scale model line have been reported. This paper reports on the comparison between the experimental analyses and EMTP simulation of power distribution lines, including low-voltage lines, and the validity of EMTP simulation. Furthermore, this paper analyzes the overvoltages on low-voltage power distribution lines against direct lightning strokes to overhead ground wire using the digital simulation.     

Transmission line arrester energy, cost, and risk of failureanalysis for partially shielded transmission lines

Application of metal oxide surge arresters in power systems has been traditionally linked to electrical equipment protection. The industry has noted a very significant increase in the application of metal oxide arresters on transmission lines in an effort to reduce lightning initiated flashovers. This paper describes a cost-effective installation of surge arresters on a partially shielded transmission line. It compares several options with respect to cost and gains in terms of lightning performance improvement. This paper also presents a new approach to calculate risk of failure of transmission line surge arresters (TLSAs) due to lightning strokes to towers, shield/phase conductors, and illustrates the method with an example for a partially shielded line. Results show that the risk of failure is very small. The installation of TLSAs completed in 1997 demonstrated that it is possible to afford adequate lightning protection levels by selectively applying surge arresters only to the towers most sensitive to backflashover and shielding failures     

Investigation of effect of transmission line arresters verified by lightning surges at substations

In recent years, transmission line arresters have been installed to protect overhead power transmission lines from backflashovers caused by lightning. In addition, it has been expected that substation lightning surges incoming via transmission lines can be suppressed by them. However, the suppression effect by those with series gaps has not been investigated sufficiently. The author has measured lightning surges at two 77‐kV substations from 1990 to 1993. As the transmission line arresters have been mounted on the towers since 1992, the lightning surges due to the sparkover of the series gap of the transmission line arresters can be observed at the substations. In this paper, the lightning surge waveforms due to such sparkover have been analyzed in detail. Next, an accurate EMTP simulation method considering the induced lightning surge voltages has been proposed. Finally, their suppression effect has been investigated by simulation corresponding to each mounting method. © 1999 Scripta Technica, Electr Eng Jpn, 126(4): 30–39, 1999     

Lightning protection of overhead power distribution lines

There are two major protective methods against lightning outages on overhead distribution lines. One is by use of surge arresters and the other is by an overhead ground wire. Surge arresters have rather constant effect regardless of the type of lightning outage causes. On the other hand, the effect of an overhead ground wire is quite different against the two major causes: direct lightning hit and induced overvoltages. This paper shows how to design lightning protection for overhead power distribution lines taking these characteristics into account. Copyright © 2007 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

层次分析法在输电线路综合防雷措施评估中的应用

基于层次分析法(Analytic Hierarchy Process,AHP)的基本原理,建立了一个用于评估输电线路防雷措施的层次分析结构模型,以某220kv实际线路为例对各种措施进行综合评估和计算,得到了该线路防雷改造方案的优先次序:降低接地电阻、架设耦合地线、增加避雷线根数、安装线路型避雷器、增加两片绝缘子.