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一种输电线路地线融冰技术方案 被引量:1
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作者 周亚兵 杨芳 王广友 《电工技术》 2023年第9期95-97,共3页
传统的输电线路地线融冰方法,全程采用人工上塔作业、拆地线引流线、进行导地线驳接等,不仅费时费力,还存在冰冻天气登塔接线作业人身风险高等问题,因此提出一种输电线路地线融冰智能刀闸技术方案。该方案具有安装操作方便、效率高等特... 传统的输电线路地线融冰方法,全程采用人工上塔作业、拆地线引流线、进行导地线驳接等,不仅费时费力,还存在冰冻天气登塔接线作业人身风险高等问题,因此提出一种输电线路地线融冰智能刀闸技术方案。该方案具有安装操作方便、效率高等特点,目前已在清远粤北山区投入使用,取得了良好的应用效果,保证了线路的结构安全及操作人员安全,积累了宝贵地线融冰接线经验,为其他线路融冰提供了参考。介绍了输电线路地线融冰智能刀闸的研发背景、技术原理、关键技术及实践效果,认为地线融冰刀闸具有较强的推广应用价值。 展开更多
关键词 输电地线 融冰 智能刀闸
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输电线路导地线图像识别算法综述 被引量:1
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作者 刘道生 赖勇耀 +1 位作者 陈星蓉 刘晖 《湖南电力》 2023年第3期103-108,共6页
基于图像识别算法可以提高输电线路导地线巡检的效率和可靠性,介绍导地线图像识别算法的研究现状,分析图像预处理、导地线提取和缺陷识别三个关键步骤的主流算法,并对其中的不足之处进行了简要分析,对输电线路导地线图像识别算法的未来... 基于图像识别算法可以提高输电线路导地线巡检的效率和可靠性,介绍导地线图像识别算法的研究现状,分析图像预处理、导地线提取和缺陷识别三个关键步骤的主流算法,并对其中的不足之处进行了简要分析,对输电线路导地线图像识别算法的未来研究方向进行了展望。 展开更多
关键词 图像识别 输电线路导地线 图像预处理 地线提取 缺陷识别
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外层腐蚀对输电线路架空地线承载力的影响 被引量:17
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作者 邓静伟 张宇 +1 位作者 陈波 吴永祥 《土木工程与管理学报》 北大核心 2018年第5期77-81,共5页
本文研究了自重荷载作用下腐蚀输电线路架空地线的承载力特性问题。首先基于非线性有限元理论建立了架空地线的分析模型,随后建立了腐蚀地线的非线性承载力分析方法,建立了腐蚀地线非线性迭代收敛准则。以我国南方某实际输电线路的地线... 本文研究了自重荷载作用下腐蚀输电线路架空地线的承载力特性问题。首先基于非线性有限元理论建立了架空地线的分析模型,随后建立了腐蚀地线的非线性承载力分析方法,建立了腐蚀地线非线性迭代收敛准则。以我国南方某实际输电线路的地线为背景,研究了自重作用下腐蚀架空地线的承载力特性。进一步通过参数研究分析了不同结构参数和腐蚀参数对其承载力特性的影响。本文研究表明:地线参数和腐蚀程度对其承载力具有较为显著的影响,弧垂和档距对腐蚀地线的应力影响很大。地线应力随着弧垂的增大而迅速减小,随着档距的增加而迅速增加。 展开更多
关键词 腐蚀 输电地线 自重荷载 非线性有限元 承载力
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超高压输电线路架空地线直流融冰试验分析 被引量:1
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作者 莫世真 杨武志 《广西电力》 2014年第5期14-16,38,共4页
验证超高压输电线路架空地线直流融冰的可行性。以500 kV桂林变电站融冰装置为例,确定超高压输电线路架空地线融冰接线方式,在此基础上介绍线路普通地线及OPGW地线融冰的仿真建模方式和特点。通过实际应用验证了超高压输电线路普通地线... 验证超高压输电线路架空地线直流融冰的可行性。以500 kV桂林变电站融冰装置为例,确定超高压输电线路架空地线融冰接线方式,在此基础上介绍线路普通地线及OPGW地线融冰的仿真建模方式和特点。通过实际应用验证了超高压输电线路普通地线及OPGW地线直流融冰的可行性。在超高压输电线路架空地线融冰试验过程中,发现地线放电间隙过小导致直流融冰装置闭锁,架空地线融冰接线方式转变困难,普通地线和OPGW地线因过电流被烧断等问题。针对以上问题提出了解决办法。 展开更多
关键词 超高压输电线路架空地线 直流融冰试验 仿真建模
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超高压输电线路架空地线复合绝缘子断裂分析 被引量:1
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作者 钟万才 《广西电力》 2014年第5期48-50,共3页
分析超高压输电线路全绝缘架空地线复合绝缘子断裂原因,提出改造措施,确保线路安全稳定运行。通过对绝缘子进行断面特征及内部解剖检查,并结合绝缘子拉力试验和受力分析结果,认为由于压接式U型联结头设计裕度不足,在覆冰的情况下绝缘子... 分析超高压输电线路全绝缘架空地线复合绝缘子断裂原因,提出改造措施,确保线路安全稳定运行。通过对绝缘子进行断面特征及内部解剖检查,并结合绝缘子拉力试验和受力分析结果,认为由于压接式U型联结头设计裕度不足,在覆冰的情况下绝缘子承受横向切力,使U型联结头与三角联板互卡,横向切力足够大时导致绝缘子断裂。在绝缘子接地端和联板之间增加直角挂板,使绝缘子与联板间有足够活动裕度,有效缓冲了不平衡荷载,解决绝缘子断裂问题。该方法简单、有效,经济可靠,在今后的全绝缘地线建设、改造中可借鉴实施。 展开更多
关键词 超高压输电线路架空地线 全绝缘架空地线 复合绝缘子 断裂
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新疆大风区输电线路地线悬垂金具磨损分析与治理
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作者 周晓智 《电力系统装备》 2019年第23期152-152,183,共2页
我国输电线路网络在不断向纵深拓展,为各地区人们提供更加完善、高质的供电服务。输电线路中各结构都量保证其运行使用的安全性与可靠性,其中针对地线悬垂金具进行的磨损治理就能够有效保障电力线路的运行稳定性。本文就地线悬垂金具在... 我国输电线路网络在不断向纵深拓展,为各地区人们提供更加完善、高质的供电服务。输电线路中各结构都量保证其运行使用的安全性与可靠性,其中针对地线悬垂金具进行的磨损治理就能够有效保障电力线路的运行稳定性。本文就地线悬垂金具在大风地区运行使用的主要磨损原因进行了分析,而后就其治理及防治措施进行了探讨,进而研究了优化管理措施。 展开更多
关键词 新疆大风区 输电线路地线悬垂金具 磨损分析 治理
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LTE-Satellite: Chinese Proposal for Satellite Component of IMT-Advanced System 被引量:3
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作者 刘思杨 秦飞 +2 位作者 高镇 张源 何异舟 《China Communications》 SCIE CSCD 2013年第10期47-64,共18页
As a complementary to terrestrial mobile communication systems, mobile satellite communication system can fill the gaps that cannot be covered by terrestrial network, and provides an irreplaceable solution for emergen... As a complementary to terrestrial mobile communication systems, mobile satellite communication system can fill the gaps that cannot be covered by terrestrial network, and provides an irreplaceable solution for emergency communication in disaster. To pave the road for future satellite/terrestrial integrated communication networks, ITU-R invited proposals for candidate Radio Interface Technology(RIT) for the satellite component of International Mobile Telecommunications(IMT)-Advanced. China proposed the RIT of Long Term Evolution(LTE)-satellite as a candidate to be considered as IMT-Advanced satellite technology. The submitted LTE-satellite candidate RIT is specified based on terrestrial LTEAdvanced FDD standards that are developed in 3GPP. Considering satellite requirements, a number of modifications to LTE-Advanced are made to adapt to satellite radio transmission environments. This paper provides a general introduction of the new characteristics of LTEsatellite. 展开更多
关键词 mobile satellite communications satellite/terrestrial integration IMT-ADVANCED
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Aeolian vibration control measures for ground wires of Han River long span transmission lines
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作者 叶志雄 《Journal of Chongqing University》 CAS 2009年第1期50-56,共7页
Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conduct... Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conductor self-damping,and the damper dissipated power. Meanwhile,we built a theoretical mechanical model of β wire dampers and derived energy dissipation calculation formulae. This permits the vibration energy dissipated by β wire dampers can be considered in the energy balance method. Then,we developed a computer program based on the improved energy balance method using Matlab,and analyzed UHV long span ground wires of the Han River long span project in P. R. China. The results show that the combination of β wire dampers and Stockbridge dampers can reduce vibration of UHV long span transmission lines,which provides a reference for research and construction of UHV engineering projects. 展开更多
关键词 ultra-high voltage transmission lines aeolian vibration energy balance method Stockbridge dampers [3 wiredampers
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An Outlook on Northwest Power Grid Development
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《Electricity》 2003年第4期16-19,共4页
In this paper the basic situation of the Northwest Region in China is introduced, the necessity for the Northwest Power Grid to develop 750 kV transmission line is analyzed, and the target for the power grid construct... In this paper the basic situation of the Northwest Region in China is introduced, the necessity for the Northwest Power Grid to develop 750 kV transmission line is analyzed, and the target for the power grid construction till 2010 as well as the planning for sending power from west to east and interconnection with adjacent grids are described. 展开更多
关键词 power grid PLANNING INTERCONNECTION 750 kV
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Fault location of two-parallel transmission line for double phase-to-earth fault using one-terminal data
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作者 张庆超 段晖 +1 位作者 耿超 宋文南 《Journal of Zhejiang University Science》 CSCD 2003年第5期520-525,共6页
An accurate algorithm for fault location of double phase-to-earth fault on transmission line of direct ground neutral system is presented. The algorithm, which employs the faulted phase network and zero-sequence netwo... An accurate algorithm for fault location of double phase-to-earth fault on transmission line of direct ground neutral system is presented. The algorithm, which employs the faulted phase network and zero-sequence network as fault-location model in which the source impedance at the remote end is not involved, ef-fectively eliminates the effect of load flow and fault resistance on the accuracy of fault location. The algorithm achieves accurate location by measuring only one local end data and is used in a procedure that provides automatic determination of faulted types and phases, and does not require the engineer to specify them. Simulation results showed the effectiveness of the algorithm under the condition of double phase-to-earth fault. 展开更多
关键词 Fault location Transmission line Double phas e-to-earth fault
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Power System Modelling and Fault Analysis of NamPower's 330 kV HVAC Transmission Line
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作者 Innocent Davidson Immanuel Mbangula 《Journal of Energy and Power Engineering》 2014年第8期1432-1442,共11页
Electric power systems usually cover large geographical areas and transmission facilities are continuously increasing. These power systems are exposed to different environmental conditions which may cause faults to oc... Electric power systems usually cover large geographical areas and transmission facilities are continuously increasing. These power systems are exposed to different environmental conditions which may cause faults to occur on the system. Different types of studies are usually done on electric power systems to determine how the system behaves before, during and after a fault condition. The behaviour of variables of interest such as currents, voltage, rotor angle and active and reactive power under fault conditions are studied and observed to help determine possible causes of faults in a power system. The objective of this paper is to investigate a fault that occurred on the 330 kV transmission line between Ruacana power station and Omburu sub-station, the fault caused all the generators at Ruacana power station to trip and consequently caused a blackout at the power station that lasted for 6 h. Preliminary findings showed that the observed fault was an earth fault but the exact type of earth fault was however not known at the time. This research investigation sets out to determine the exact fault that occurred; the most probable cause of the fault, and propose possible solutions to prevent reoccurrence of such a fault. The section of the power network in which the fault occurred was modelled using DigSilent Power Factory software tool, and transient fault analysis was carried out on the model for different fault conditions. Results obtained were then compared with data obtained from NamPower records to ascertain the type of fault. 展开更多
关键词 Fault analysis power system transient stability
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Geospatial Solutions in Practice for Smart Grids
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作者 Peter Birk Chris Pavlovski 《Computer Technology and Application》 2011年第3期165-171,共7页
Recently, smart grid solutions have started to extend the visibility of the electrical grid to the entire network; including high voltage transmission lines, medium voltage distribution networks, and the low voltage n... Recently, smart grid solutions have started to extend the visibility of the electrical grid to the entire network; including high voltage transmission lines, medium voltage distribution networks, and the low voltage networks to households. The typical data monitored includes: voltage, current, phase, and power measurements, together with network events and alarms. This paper analyses the key challenges facing smart grid solutions in providing effective access to large volumes of sensory data that is distributed over a large geographic area. A case study is described that outlines how the use of geospatial technology together with Web 2.0 technologies may be applied to improve user access and control to this data. The results show that a geospatial solution provides an effective mechanism for visualizing telemetry data monitored within the smart grid. 展开更多
关键词 GEOSPATIAL energy distribution graphical information system (GIS) smart grid.
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Analysis of Short Circuit Faults in a System Fed by Wind Turbine
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作者 Ahmet Nayir Eugeniusz Rosolowski Leszek Jedut 《Journal of Energy and Power Engineering》 2013年第9期1809-1815,共7页
Short circuit and ground failures that are quite common in power transmission lines are investigated. These failures are designed considering a system that is supplied by this wind system, and analyses are interpreted... Short circuit and ground failures that are quite common in power transmission lines are investigated. These failures are designed considering a system that is supplied by this wind system, and analyses are interpreted. In the study, a system is set up and it is fed by the wind turbine. Furthermore, the mathematical model of wind turbine and generator is prepared and the results obtained from the simulation are evaluated. The short circuit and ground fault analyzes were performed separately for each of the three phases. ATP (alternative transient program)-EMTP (electromagnetic transients program) program is used in the analysis and the results obtained were found to be quite compatible. 展开更多
关键词 FAILURES GENERATOR wind system wind turbine power transmission lines.
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An optimized transmission line model of grounding electrodes under lightning currents 被引量:4
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作者 YANG Lin WU GuangNing CAO XiaoBin 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第2期335-341,共7页
In this paper, an optimized transmission line model (OTL) for modeling transient behavior of grounding electrodes under lightning currents is presented. The soil ionization effect is considered in OTL, and all elect... In this paper, an optimized transmission line model (OTL) for modeling transient behavior of grounding electrodes under lightning currents is presented. The soil ionization effect is considered in OTL, and all electromagnetic couplings between dif- ferent parts of grounding electrode are also considered by selecting the size of segment conductor properly and calculating the mutual coupling parameters between segment conductors accurately. Comparing with the traditional transmission line model, the optimized model can be used to accurately predict the effective length and transient potential rise (TPR) of grounding elec- trodes. Transient behaviors of grounding electrodes are simulated by OTL and the results are in good agreement with those of the electromagnetic model proposed by Grcev, and experiment results performed by Electricit6 de France and Geri. Further- more, non-uniform discharging phenomenon of grounding electrode under lightning current is discussed, and the effective lengths of horizontal grounding electrode under lightning currents are presented. 展开更多
关键词 grounding electrode lightning current transmission line model electromagnetic mutual coupling
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