共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
4.
Fernandez M.I. Rambo K.J. Rakov V.A. Uman M.A. 《Power Delivery, IEEE Transactions on》1999,14(2):411-418
In 1996, at the International Center for Lightning Research and Testing (ICLRT) at Camp Blanding, Florida, the responses of MOV arresters in an unenergized test distribution system, composed of an overhead line, underground cable, and padmount transformer with a resistive load, were measured during very close, direct lightning strikes to the overhead line. Arresters were installed on the overhead line at two locations 50 m apart (on either side of the strike point) and at the primary of the padmount transformer which was connected to the line via the underground cable. We obtained arrester data for this test configuration from two lightning flashes (containing a total of five strokes) which were artificially initiated from a natural thunderstorm, using the rocket-and-wire technique. We present the simultaneously-recorded arrester discharge current and voltage waveforms from one lightning stroke for one of the two arresters on the line and for the arrester at the transformer primary. Additionally, we estimate the energy absorbed by the arrester on the line as a function of time for the first 4 ms of the lightning event. The records presented are representative of those for all five strokes 相似文献
5.
SUSUMU MATSUURA KATSUHIKO SHIMASAKI HITOSHI SUGIMOTO 《Electrical Engineering in Japan》2016,195(4):1-8
Distribution surge arresters with an internal series gap have been installed on Japanese distribution lines at high density to reduce lightning‐related overvoltages. In contrast, surge arresters are sometimes damaged by direct lightning strokes, particularly in winter. Measurement of the insulation resistance between the terminals of the surge arrester and measurement of the dc discharge voltage of the surge arrester are generally adopted to detect damaged arresters. However, if metal‐oxide (MO) varistors are damaged and the internal series gap is not damaged, it is difficult to detect damaged arresters by the two conventional methods. Therefore, this paper presents a proposed detection method that can accurately detect damaged arresters. In the proposed method, first, the voltage between the terminals of the surge arrester is measured when the output of an impulse generator is applied to the surge arrester. Second, the damaged arrester is detected by comparison between its voltage waveform and the voltage waveform of the nondamaged arrester. The detection rate of damaged arresters by the proposed method is markedly higher than the rates of detection by the two conventional methods. 相似文献
6.
采用避雷器防止10kV架空绝缘导线雷击断线 总被引:9,自引:0,他引:9
在绝缘导线应用于配电线路的建设中,10 kV架空线路雷击断线事故是影响安全供电的大问题.通过分析架空绝缘导线雷击断线的机理,介绍安装线路型金属氧化物避雷器可有效限制雷电过电压对配电线路的危害,减少绝缘导线配电线路的雷击断线事故,保证配电线路的安全运行,指出安装线路型避雷器这一防雷技术存在的问题,并分析了线路型避雷器的安装密度和保护效果. 相似文献
7.
安装避雷器是减少配电线路雷击故障的主要措施.采用时域有限差分(finite difference time domain,FDTD)算法求解多导体传输线场线耦合方程,重点研究安装避雷器的配电线路雷电感应过电压的波形特性和统计特性.对比分析了10 kV 配电线路在有/无避雷器,不同避雷器安装密度时感应过电压的波形和幅值.对不同避雷器安装密度时是否考虑直击雷的情况下线路最大感应过电压特征进行了分析,给出了安装避雷器后最大感应过电压概率分布、绝缘闪络率和闪络次数等统计结果,以及配电线路避雷器的推荐安装密度 相似文献
8.
The application of arresters on transmission lines has been one of the most effective alternatives for the reduction of lightning flashover rates. This paper reviews previous methods for evaluating lightning performance of lines with arresters. Improved calculations of line outage rates are developed to include power frequency voltage and arrester failure-rate evaluations, based on field experience. The transmission lines are modeled in detail in the electromagnetic transients program (EMTP)/(ATP) and the outage rates are calculated with the Monte Carlo method. Probability energy stresses on arresters are evaluated for strokes on conductors and shield wires as a function of tower footing resistance (TFR). 相似文献
9.
More and more applications of ZnO arrester in electrical system experienced more problems.One thing,that is still under some investigation,is the effect of multiple lightning strike to the performance of ZnO arrester.As we know,the design of ZnO arrester for transmission system and for distribution system differs in the point of view of the number of ZnO blocks.Transmission system,due to its higher nominal voltage than distribution system,has more numbers of ZnO blocks inside an arrester tube.In term of the current rating of an arrester,it is found that there is some different value of the current rating.The current rating of an arrester installed closer to electrical substation is higher than that of some further away from the substation.To the respond of a lightning impulse strike,the arrester will let a high value of impulse current flowing.It tends to heat the ZnO material of the arrester.If the number of impulse strike is quite high then it may give the effect to the change of the arrester performance.This condition will endanger the equipment that is protected by the arrester from lightning strikes.During this research,the scope of work is limited to making an impulse current generator toward to one having 8/20 μs wave-shape.This kind of impulse current wave-shape is the one that is used for studying the performance of ZnO block.The effect of the inductance and capacitance of the impulse current generator were also studied.A 10 fused cut out was blown by an impulse having 10321 A of 17.8/37.8 μs.A ZnO arrester block brokendown/allowed large value of current :10982 A flowing under the voltage of 10.5 kV 相似文献
10.
11.
架空输电线路在电力系统中作为用户与发电厂的连接枢纽,线路可靠防雷与安全运行尤为重要。分析由输电线路上测得的雷电数据,证实了多脉冲雷电的存在,统计并分析雷电波前时间、波尾时间、极性及幅值参数。电磁暂态仿真软件ATP-EMTP对多脉冲雷电、架空输电线路、杆塔、绝缘子串、避雷器建立仿真模型。仿真分别计算在线路是否安装避雷器时,在单脉冲和多脉冲下发生直击和反击时的响应情况。比较两种不同脉冲雷电下线路过电压的差别。仿真分析表明:避雷器能有效的限制雷电过电压的幅值,并且在多脉冲雷电冲击时,输电线路会出现更高的雷电过电压,且持续时间更长的现象,使其防雷形势更加严峻。 相似文献
12.
分析线路避雷器在天生桥地区220 kV及以上交流线路防雷工作中的应用情况。通过查询雷电定位系统,统计天生桥地区雷电参数,总结、分析2001年以来该地区输电线路雷击跳闸情况,结果表明安装线路避雷器能有效降低线路雷击跳闸率,具有较好的防雷效果。根据运行经验及线路避雷器只对安装塔安装相有保护作用的特点,提出了线路避雷器安装选点和运行维护方面的建议。 相似文献
13.
Harder John E. Hughes Albert E. Vosicky Jan 《Industry Applications, IEEE Transactions on》1981,(5):445-451
Many industrial power systems have lightning exposure, requiring surge (lightning) arresters; dry-type transformers, requiring low protective levels; and high available fault currents, making the use of current-limiting fuses desirable. On occasion, current-limiting fuse arc voltages have resulted in destruction of low characteristic arresters. A traditional guideline has been to select arrester types and ratings that will not spark over on current limiting fuse maximum arc voltage?an approach that may not be entirely viable for industrial systems. A step-by-step analytical approach to the selection of surge arresters for use with current-limiting fuses is presented. The method presumes arrester sparkover and is based on determination of system energy, fuse arc voltage and arrester back voltage characteristics, and arrester energy capability. 相似文献
14.
In measurements of rocket-triggered lightning current and voltage performed between 1986 and 1995 on the mountain top of Okushishiku in the Kanazawa area, the authors succeeded in artificially inducing winter lightning to arresters. Using the data obtained from those measurements, we analyzed the energy absorption characteristics of surge arresters, such as are installed on every transmission line tower for three phrases, by EMTP. The energy withstand capability of an individual arrester was verified to be approximately the same as the expected value. The analysis results for the energy share of each arrester connected in parallel showed that the usual light duty arresters installed on every tower have the possibility to be able to absorb extreme winter lightning energy even if the lightning hits the power line directly. © 1998 Scripta Technica. Electr Eng Jpn, 122(4): 25–33, 1998 相似文献
15.
16.
避雷器异常放电的现有识别方法难以判断异常放电时的吸收声波特性,导致识别结果不准确,以110 kV交流避雷器为研究对象,对避雷器异常放电类型进行识别。采用声发射技术来检测110 kV交流避雷器雷电异常放电特性,获取雷电影响下110 kV交流避雷器放电时的吸收声波;基于获取的放电吸收声波,采用关联维数的避雷器雷电异常放电吸收波特征分析方法,实现110 kV交流避雷器雷电异常放电吸收声波的特性分析。实验结果表明:该方法通过关联维数判断避雷器放电吸收声波的特性,能够有效判断雷电影响下110 kV交流避雷器每种异常放电的情况,且通过该方法识别110 kV交流避雷器雷电异常放电类型时,识别结果全部通过,因此该分析方法的应用价值显著。 相似文献
17.
《Power Delivery, IEEE Transactions on》1989,4(4):2076-2089
The authors compare the reliability of metal oxide and silicon carbide distribution arresters by examining the likelihood of failure as a result of moisture leakage and contamination, overvoltages, and lightning surges of high magnitude and long duration. It is found that metal oxide distribution arresters should be highly reliable in most applications because the arresters are far less likely than silicon carbide arresters to fail as a result of moisture ingress and contamination. Metal oxide arresters are more likely to fail as a result of system overvoltages because they conduct current in response to the overvoltages, and for this reason somewhat more care must be exercised in application to match the magnitude and time duration of system overvoltages to the temporary overvoltage capability of the arresters. Comparison of published metal oxide arrester energy absorbing capability against the energy absorbed in lightning surges that have been shown to exist indicates that the probability of failure may be high in areas of high lightning intensity. The authors suggest changes in the ANSI/IEEE C62.11 standard for metal oxide arresters to improve arrester reliability on lightning surges 相似文献
18.
Kazuo Nakada Tsutomu Yokota Shigeru Yokoyama Akira Asakawa Tetsuji Kawabata 《Electrical Engineering in Japan》1998,122(2):12-20
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 相似文献
19.
330kV线路避雷器的开发和应用 总被引:1,自引:0,他引:1
介绍了330 kV线路型无间隙金属氧化物避雷器的主要性能参数的确定,以及通过避雷器电位分布的实际测量,优化避雷器的均压结构;对安装在杆塔上的330 kV线路避雷器,采用在避雷器高压端加装直径为1m的均压环,在第一节和第二节避雷器元件间安装均压环的均压措施,使得避雷器的最大电位分布不均匀系数小于或等于13.56%,保证了避雷器的可靠运行;提出了避雷器在不同类型的杆塔上的两种安装及避雷器安装点的选取原则.开发的避雷器已在陕西省多条330 kV线路上应用,取得了显著的防雷效果. 相似文献
20.
Yasutomo Imai Nobuyuki Fujiwara Hiroshi Yokoyama Tetsuro Shimomura Koichi Yamaoka Shinji Ishibe 《Electrical Engineering in Japan》1994,114(6):63-75
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. 相似文献