oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2016 ( 7 )

2015 ( 333 )

2014 ( 260 )

2013 ( 283 )

自定义范围…

匹配条件: “输电线路” ,找到相关结果约2934条。
列表显示的所有文章,均可免费获取
第1页/共2934条
每页显示
输电线路智能监测系统通信技术应用研究
Application Research of Communication Technology for Intelligent Monitoring of Transmission Line
 [PDF]

邹冬超, 李开红, 陈宝仁
Smart Grid (SG) , 2014, DOI: 10.12677/SG.2014.41003
Abstract:
本文从输电线路智能监测系统通信网络架构、通信需求分析出发,研究智能在线监测系统的四种通信组网模式和传输通道要求,提出输电线路智能监测系统通信解决方案。在输电线路智能监测系统应用中,通过EPON + 宽带无线MESH工业交换机 + 宽带无线MESH光纤 + 分布式无线宽带系统、无线公网等多种方式的介绍和方案优缺点分析,因地制宜的选择合适的通信模式,实现电力输电线路及杆塔运行状态实时监控,可有效提高输电线路安全性。
On the basis of the intelligent monitoring system communication network architecture and communication needs analysis, we have researched the requirements of the intelligent online monitoring system of four kinds of communication modes and the transmission channel, and discussed the solution of the transmission line communication intelligent monitoring system. In the application of intelligent monitoring system for transmission line, through the “EPON + broadband wireless MESH”, “industrial switches + broadband wireless MESH”, “fiber + distributed wireless broadband system”, the wireless public network and other means of introduction and scheme analysis of advantages and disadvantages, we chose an appropriate communication mode to suit one’s demand to local conditions, to achieve real-time monitoring of power transmission lines and tower operation state, which can effectively improve the security of transmission line.
某750kV输电线路雷击跳闸原因分析
康钧,包正红,张仲秋,周瑜,曲全磊
电瓷避雷器 , 2014,
Abstract: 介绍了某750kV输电线路故障跳闸情况,分析雷击跳闸原因,并对架空输电线路防雷工作提出降低杆塔接地电阻、减小避雷线保护角、增加线路外绝缘水平等防范措施,提高了750kV输电线路防雷性能。
一种使用两端电气量的高压输电线路故障测距算法
董新洲葛耀中
电力系统自动化 , 1995,
Abstract: 提出了一种使用两端电流、一端电压的高压输电线路故障测距算法。该算法从原理上克服了对端系统助增电流和过渡电阻对故障测距的影响,并对高压长线的电容充电电流进行了迭代补偿;EMTP仿真结果表明,算法有较高的精度。
输电线路双端行波故障定位新算法
李泽文,曾祥君,徐晓菁,雷莉,张小丽
电力系统自动化 , 2006,
Abstract: 双端行波故障定位原理简单,但受行波波速的不确定、输电线路长度差异以及行波波头到达时间记录不准确等因素的影响,容易出现较大的定位误差。在常规双端行波故障定位原理的基础上,提出了一种新型输电线路双端行波故障定位算法,通过记录故障初始行波到达线路两端的时刻、参考端记录的故障点反射行波和对端母线反射行波到达时刻,解方程组得到不受波速和线路弧垂影响的故障定位结果。实际应用结果表明,该算法具有较高的定位精度。
现代行波测距技术及其应用
徐丙垠,李京,陈平,陈羽,董新洲,葛耀中,P.F.Gale
电力系统自动化 , 2001,
Abstract: 介绍了利用电压、电流行波进行线路故障测距的方法。单端法是测量故障产生的行波在故障点及母线之间往返一趟的时间来计算故障距离,双端法利用故障行波到达线路两端的时间差测距。阐述了故障行波信号的测量、超高速记录、行波脉冲的小波检测以及双端装置时间精确同步等关键技术问题的解决方案以及行波测距技术实际应用中的若干问题。
基于三端行波测量数据的输电线路故障测距新方法
张峰,梁军,张利,贠志浩
电力系统自动化 , 2008,
Abstract: 行波波速的不确定性往往给行波故障测距带来较大误差。目前消除波速影响的单、双端行波故障测距方法中,常存在折反射后的行波衰减至不可测量的问题,此情况下该方法将失效或存在很大误差。在行波故障测距原理基础上,提出了一种新型的不受波速影响的输电线路三端故障测距方法,检测故障行波波头到达故障线路本端、对端以及相邻线路对端共3个母线测量点的时刻,由这3个时间参数得到的故障距离表达式中消除了波速的影响和线路弧垂造成的误差。仿真结果表明,该方法定位精度高且简单、可靠。
邻近交流线路时直流输电线路电晕损失的计算与分析
周象贤,卢铁兵,崔翔,赵志斌,甄永赞,罗兆楠,方超
中国电机工程学报 , 2011,
Abstract: 为了对与交流线路邻近的直流输电线路的电晕损失进行预测,提出了一种计算交直流混合输电线路走廊中直流输电线路电晕损失的数值计算方法。该方法采用有限元和有限体积法计算交直流输电线路产生的混合离子流场,通过在每一时间步上进行迭代求解导线表面的电荷密度,使其满足Kaptzov条件,进而获得导线电晕电流,实现电晕损失的计算。该方法采用隐式时间差分,可采用较大的时间步长,提高了计算速度。通过与多种结构交直流邻近线路模型的测量结果的对比,验证了算法的有效性。利用实验和仿真分析,获得了电晕损失随邻近距离、交流电压值的变化规律。最后,基于所提出的方法对与1000kV交流线路邻近的±800kV直流线路的电晕损失进行了分析计算,得到了不同接近距离时的直流电晕损失值。
输电线路鸟害故障分析及防范措施
Fault Analysis and Countermeasures of the Bird Damage on Transmission Line
 [PDF]

牛彪, 王健, 蔡炜, 刘晓伟, 田丁
Transmission and Distribution Engineering and Technology (TDET) , 2013, DOI: 10.12677/TDET.2013.22008
Abstract: 通过对输电线路运行情况进行相关调研和分析,发现鸟害是造成输电线路跳闸故障的一个主要因素。本文对相关统计数据进行分析,从线路特点、地理环境、鸟类生活习性等方面综合分析了鸟害故障的成因,并进一步分析了鸟害故障的特征。在全面借鉴行业先进经验的基础上,结合某省份的实际情况,依据鸟害防治原则,从不同故障种类给出了相应的鸟害故障防范措施;并结合该省输电线路鸟害故障的不同程度对鸟害故障的防治提出了进一步的整改措施。
By researching and analysing the operation of the transmission line, the author find that bird damage is a major factor in the failure of the transmission line tripping. In this paper, after analysing related statistical data, the author elaborate the causes of bird damage through line characteristics, geographical environment and birds living habits. Then, the author analyzes the characteristics of bird damage failure. On the basis of fully learning from the advanced experience of the industry, the author gives the countermeasures of the bird damage from a different fault type combined with the actual situation in certain provinces and the principle of bird damage prevention. Further corrective measures with the prevention of bird hazard are proposed according to degrees of failure of transmission lines in the province.
复合绝缘子在输电线路防污闪技术中的应用
Application of Composite Insulators Used in the Technology of Anti-Flashover in Transmission Lines
 [PDF]

许青龙, 许元帅, 赵纪宗, 许园园
Smart Grid (SG) , 2014, DOI: 10.12677/SG.2014.43015
Abstract:

电力系统运行中,高压输电线路绝缘子污闪是一种常见的事故,其对于输电线路的安全运行以及电力系统安全运行有着非常重要的影响。随着输电线路的防污闪技术研究不断深入,清扫积污、调整爬电距离、使用防污闪涂料、采用复合绝缘子等技术应运而生。其中复合绝缘子以其优良的抗污特性,被广泛应用于防污闪技术中。本文综述了绝缘子污闪的机理、输电线路防污闪措施、合成绝缘子结构特点、优良性能,及在其使用过程中的常见问题。
In the operation of power system, insulator flashover is a common accident which has serious effect on high voltage transmission line. Some methods, such as cleaning contamination, creepage distance adjustment, using anti-flashover coating and using composite insulators, have been emerged with the development of anti-flashover technology. Among those methods, the composite insulators were widely used because of its excellent stain resistance characteristics. This paper reviews the mechanism of flash insulator pollution, measures of anti-flashover, structural characteristics and excellent performance of composite insulators. Finally, frequently asked questions in the course of its use were discussed.

一种输电线路雷击概率预测方法及其在输电系统短期可靠性评估中的应用
A Transmission Line Lightning Strike Probability Prediction Method and Its Application to Transmission System Short-Term Reliability Evaluation
 [PDF]

杨清, 熊小伏, 王建, 翁世杰
Smart Grid (SG) , 2014, DOI: 10.12677/SG.2014.42008
Abstract:
输电线路长期暴露在大气环境之中,雷电天气下输电线路易发生雷击跳闸事件,严重影响输电系统可靠性,有必要针对雷电天气下的输电网可靠性进行评估。本文研究了输电线路在雷电天气下的故障概率模型,并用于在预报天气状况下的输电网可靠性预测(评估)。首先根据历史雷电记录建立雷击故障概率模型,然后根据此概率模型对未来雷电天气下的输电线路雷击故障概率进行计算,并进而计算输电网可靠性指标。通过IEEE RTS-79测试系统验证了所提方法的有效性,算例结果表明,雷电天气对输电线路和系统可靠性有较大的影响。该模型可以指导雷电天气下电网短期运行和在线调度决策。
The transmission lines are exposed to the atmospheric environment and will be affected by adverse weather such as lightning storm, so that it will affect the reliability of transmission system. This paper studies the fault probability model of transmission line during the lightning storm, and evaluates the short-term reliability of transmission system in the forecasting weather condition. Firstly, we build the lightning strike fault probability model of the transmission line based on historical lightning record information, then calculate the lightning strike probability under the forecasting weather conditions, and furthermore evaluate the reliability index of transmission system. We utilize IEEE RTS-79 system to verify the validity of the proposed model and the results show that lightning has great negative influence on the transmission lines and the reliability of transmission system. The reliability evaluation model proposed in this paper can guide the short-term operation and online scheduling for transmission system operators.
第1页/共2934条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.