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配电线路跳闸或单相接地的故障较多,如何迅速查找、隔离故障点,缩小停电范围和缩短停电时间,成为当前配网人员要解决的主要问题.文章列举了典型的配电线路故障处理案例,介绍了目前故障定位系统在配电网故障处理中的应用,总结了配电网故障处理的基本流程,并提出了一些改进性建议. 相似文献
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随着线路故障检测技术和设备硬件技术的进步,配电网故障自动定位技术作为简易型配网自动化的实现方式,以其投资小、见效快、安装维护方便等优点,成为配电自动化建设的重要组成部分。在县城和农村配电线路中,应用故障自动定位技术成为提高故障抢修效率、缩短故障停电时间的重要手段。配电网故障自动定位技术依赖于故障"遥信"信息的及时、可靠上传,因此故障自动定位技术中的通信环节成为影响配电网故障自动定位的关键环节。比较和分析了在县城和农村配电线路故障自动定位系统中常用的通信技术手段,并提出针对不同条件下多种通信方式相结合的故障自动定位系统,做到对线路故障定位的全覆盖,为县城和农村配电网故障快速定位探索出一条有效的途径。 相似文献
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直流配电网内故障元件的快速、可靠识别及准确隔离是直流配电网的技术难点之一。针对故障自清除型换流器结合快速隔离开关的直流配电方式,该文提出一种无需检测线路两端电气量的故障元件识别方法。研究了基于网络结构及母线电气量的母线虚拟电压计算方法;利用母线虚拟电压在不同故障位置时的差异,研究直流线路故障的快速识别及定位方法,并提出利用换流器内子模块投切选择实现母线故障与线路端部故障的辅助识别方法。该故障元件识别方法仅利用换流器出口电流和母线电压实现全配电网的故障元件快速识别,而无需测量线路两端电气量,且不受配电网结构限制,兼顾了经济性和可靠性。 相似文献
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针对强台风环境下配电线路故障问题,提出了一种台风到来前配电线路故障概率评估方法。首先,根据历史灾害损失数据拟合强台风环境下的杆塔故障概率曲线;其次,利用流体力学软件对配电网所在区域进行风荷载仿真计算;最后,在真实台风环境下根据台风实时气象信息计算配电网所在区域的风荷载,并计算配电线路整体故障概率。算例验证了强台风环境下该方法对配电网线路故障概率评估的合理性和实用性,该方法可为中国东南沿海配电网台风期间应急预警及防灾减灾工作提供借鉴参考。 相似文献
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线路故障是影响配电网运行安全性、可靠性和稳定性的重要因素.本研究主要从某地区10kV配电网线路故障现状出发,借助配电自动化技术和GIS定位技术,构建配电网线路故障快速定位系统,对网架结构、状态数据等进行分析,确定配电线路故障处理和运行维护的关键点.望在一定程度上推动智能配网建设和发展进程. 相似文献
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为了提高配电网的供电可靠性,提出了基于整数线性规划模型的故障指示器优化配置方法。该方法以配电网小电流接地运行方式为背景,建立多分支配电线路上任意故障点所需巡线时间的数学模型,以故障指示器投资运维成本最少为目标,进而减少配电网的停电时间。该方法通过合理配置故障指示器在配电线路上的位置,确保任意故障点被精确定位的时间不大于系统允许带故障运行时间,最大限度地保证用户供电可靠性。最后,针对江苏某实际10 kV配电系统进行算例分析。测试结果表明,所提模型能够实现不同故障点在系统允许带故障运行时间内的精确定位,并有效降低故障指示器的投资运维成本。 相似文献
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《Electric Power Systems Research》2005,75(1):51-55
This paper presents new techniques for locating short circuit and open conductor faults on automated distribution system. This is a unique method where short circuit and open conductor faults are treated simultaneously. The proposed fault location scheme is capable of accurately identifying the zone in which fault occurs. Temporary faults are also detected which may not result in a blown fuse. Data is made available to the substation remote terminal unit from various automated distribution system equipments. Decision is taken based upon the magnitude of fundamental frequency component of voltage and current phasor. Testing of proposed fault location method has been demonstrated on the laboratory model for its practical use. Analogues simulation results are obtained using electromagnetic transients program (EMTP). 相似文献
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This article evaluates the effect of randomly distributed, residential single-phase rooftop photovoltaic systems in the low voltage residential networks, during short-circuit faults on the overhead lines. The important parameters such as the fault current, the current sensed at the distribution transformer secondary, and the voltage profile along the feeder during the fault are examined. A sensitivity analysis is carried out in which the rating and location of the photovoltaic systems in the feeder, as well as the fault location and type, are the considered variables. Moreover, to demonstrate the effect of multiple photovoltaic systems with different ratings and penetration levels when distributed unequally among three phases of the network, a stochastic analysis is carried out. The article summarizes the outcomes of these two analyses to provide a better understanding of the impact of single-phase rooftop photovoltaic systems on the residential feeders during short-circuit faults. 相似文献
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There has not been a satisfactory solution to identifying and locating evolving faults on transmission lines until now. This paper presents an integrated detection and location approach for evolving faults based on transient traveling waves. Evolving faults include two sequential faults, resulting in the change of fault phase. The feature aerial mode of captured current traveling wave only reflects the feature of the second fault occurrence, and is used for analyzing the second fault. By combining traveling wave and transient energy features, fault phase selection can be implemented at two stages: the initial fault occurrence, and the short period before fault clearance. The evolving faults can be determined according to the consistency of the two-stage phase-selection results. Subsequently, the positions of the two successive faults can be precisely acquired by individually implementing the double-ended traveling wave fault location on the initial fault phase as well as the feature aerial mode currents, respectively. Digital simulation studies based on the simulation software PSCAD/EMTDC demonstrate that the proposed method is feasible and effective. 相似文献
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采用虚拟网络加网络操作法的双回线故障计算方法 总被引:2,自引:0,他引:2
文中在双回线故障端口接入结构固定的虚拟网络,采用对虚拟网络进行网络操作的方法模拟双回线跨线短路故障、断相故障或跨线短路加断相故障,建立起双回线各种故障计算的统一模型。基于线性电路的基本定理,借助于相序参数变换技术,提出了一种针对双回线各种故障计算的新方法。该方法的优点为:①双回线跨线短路故障、断相故障和跨线短路加断相故障具有统一的计算模型和计算方法;②可精确地模拟双回线金属性或非金属性跨线短路故障、完全或不完全断相故障,以及由它们组合而成的各种跨线短路加断相故障;③对双回线是否存在公共母线无特殊要求;④无需形成复合序网,适用于序相两种坐标。 相似文献
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