A Brief Introduction to Features of Equipment and operating Condition of 500 kV Transmission Lines and Substations in Northeast China Electric Power Network

This article introduces the features ofequipment and operating condition of 500kV transmission lines and substations inNortheast China Electric Power Networkfrom the operation Point of view. The operatingand technical levels of domestic equipment arethe focus of discussion in the article.

Power Transmission and Distribution Equipment in Steady Progress

SEC is not only one of the largest enterprise groups in China that engaged in designing and manufacturing of power generating equipment, but also is noted for designing and manufacturing power transmission and distribution equipment. Shanghai Power Transmission and Distribution Equipment Corporation is a subsidiary of SEC. It consists of key enterprises, including Shanghai Hua Tong Switchgear Works, Shanghai Relay Plant,Shanghai Instrument Transformer Works, Shang-

Suggestion on 9th Five year and 2010 plan for transmission and substation equipment

China’s power transmission equipment industry has formed, through technical innovation and development in past several decades especially in the period from the "6th Five Year Plan" to "8th Five Year Plan", a capability in furnishing equipments for 15,000 MW yearly key power transmission, power networks and substations project with voltage up to 500 kV. These achievements

Manufacturing Development Emphases on Power Generation and Transmission Apparatus in 11th Five-Year Plan Period and Prospect to the Year 2020

Based on predictions on Chinese power development in the coming 20 years, this paper introduces the emphases and key technologies in power sources and power network construction, and puts for ward the major tasks and technological orientation for machinery manufacturers to supply qualified equipment to China power industry.

Influence of equipment excitation on flexible carbody vibration of EMU

To study the vibration transmission character istics of a flexible carbody and its suspended equipment, a vertical mathematical model of highspeed electric multiple unit was established with equipment excitation considered. And the dynamic unbalance and impact turbulence excita tion from equipment were taken into account in a single stage and twostage vibration isolation system, respectively. Results show that the excitation transferred to carbody increases with suspension stiffness but decreases with the equipment mass increasing; the vibration transmission can be reduced by increasing the equipment mass or reduce the suspension stiffness. To avoid vibration resonance, the dynamic unbalance frequency of equipment should be out of the possible range of the carbody flexible modes, and a small stiffness should be applied to reduce the impact tur bulence. A small stiffness, however, would result in a large movement of the equipment which is limited by the static deflection requirement, while a great stiffness will transfer high frequency vibration. Therefore, a preferred stiffness should make the suspension frequency of equipment a bit greater than the first bending mode of carbody. Additionally, a 3D rigidflexible coupled dynamics model was built to verify the mathematical analysis, and they show good agreements. Results show that a twostage isolation could reduce the excitation transmission and make the vibration of carbody and equipment acceptable.

Overview of development, design, testing and application of compact gas-insulated DC systems up to ±550 kV

The development of high-voltage direct current gas-insulated switchgear assemblies(DC GIS)of rated voltages up to±550 kV has been completed.DC GIS provide a compact technical solution with a high functional density,optimized for projects with limited space as in offshore HVDC converter platforms,onshore HVDC converter stations and transition stations between different transmission media.Up to now,no standards for testing of gas-insulated DC systems are available,although pre-standardization work is in progress within CIGRE.Some tests can be performed as required in AC GIS standards.Special aspects of DC voltage stress,like the electric field distribution of insulators influenced by the accumulation of electrical charge carriers and the operation-related inhomogeneous temperature distribution,must be considered by additional electric and thermoelectric tests.For DC GIS,the experience of long-term performance is limited today.Although ageing is expected to be of lower importance,tests are recommended.This contribution summarizes the physical and technical background to design and develop compact DC switchgear assemblies using gas-insulated technology.It explains the developed modules of the substation and gives an overview of the performed tests.Furthermore,it provides an insight in the on-going standardization activities and describes applications in converter and transition stations,showing its space-saving characteristics.

Basic Concept and Theoretical Study of Condition-based Maintenance for Power Transmission System

状态检修背景下,为解决电网运行整体与输变电设备个体之间的矛盾和冲突,在已有研究成果基础上,提出电网状态检修的概念,在输变电设备状态检修决策过程中,给出电网故障风险和电网检修风险的定义以及相应的量化表达式。依据设备状态预测,以电网故障风险和电网检修风险的和最小为目标,将设备检修、运行以及电网整体性能在概率引导下相互牵制,形成电网状态检修的数学模型,并给出相应的解决方法。最后,为验证该理论研究的可行性,分别以可靠性测试系统RBTS-BUS6和IEEE-RTS79系统为例,对各种情况进行分析,体现了预期的效果,并期望为电网检修与运行协调决策理论的深入研究提供必要的理论基础。

Reliability of Power Transmission and Transformation Facilities in 2010

Through the reliability analysis on transmission and transformation facilities with 220 kV or above voltage level in China in 2010, particularly by investigating the planned and unplanned outage of transformers, circuit breakers and overhead transmission lines with 220 kV, 330 kV and 500 kV level, the weak parts that may influence the operational reliabilities are figured out from technical and liability causes. Moreover, through the research on the device models and comparison of performance indices between domestic and imported devices, the trend of the reliability changes are identified so that the references can be provided for power enterprises to determine corresponding effective reliability measures during planning, design, implementation and production stages.

LNG储运安全保障技术发展与展望

中国作为液化天然气(LNG)进口大国主要通过LNG运输船运至沿海地区的LNG接收站,经气化后向内陆地区通过管道进行输送,其中,储罐和高压泵等储运关键设备发挥着核心支撑作用。本文阐述了LNG从船运到LNG接收站再进入管线输送过程中所涉及的LNG储运技术与关键设备发展状况,分析了LNG船运过程传热与蒸发抑制技术,储存、冷凝及气化等静设备以及长管线输送动力设备等关键设备的研发难点,讨论了LNG管线安全输送保障技术。提出了要进一步加强理论研究和关键技术突破,重点研发LNG储运关键设备,确保LNG储运过程的安全可靠性,实现LNG储运关键设备全部国产化和能源重大工程的自主可控发展。

基于STM32的无线传输便携式风速表的设计

针对矿井下人工测风速度慢、任务繁重、数据记录困难,后期数据处理复杂、耗时多及易出错的问题,设计研发一款具备数据保存、无线数据传输以及数据初步处理功能的便携式风速表,并同时搭配上位机数据管理平台。详细介绍了仪器的硬件设计和软件设计,并对其进行了实验验证。结果表明,该仪器具有较高的准确性和稳定性,满足使用要求。能够显著减轻井下测风人员的工作负担,降低后期数据处理的繁杂程度。为风速风量快速精准测定以及智能通风的实现提供了技术支撑。

基于垂直中继的U型高压线路无线供电系统设计

为解决110 kV输电线路杆塔侧在线监测设备的供电问题,文中提出一种基于垂直中继的U型高压线路无线供电系统。首先结合互感耦合理论与有限元仿真,提出U型无线供电系统的整体设计方案,实现杆塔侧在线监测设备长距离、大功率、高效率、宽频带的无线供电。在此基础上建立系统级仿真模型,对U型无线供电系统的距离特性、频率特性、负载特性及电磁分布特性进行分析,验证了设计方案的可行性和电磁兼容性。最后搭建实验平台,在600 kHz的工作频率和1.2 m的传输距离下,系统输出功率达到73.58 W,能够满足杆塔侧在线监测设备的实际功率需求,为无线电能传输技术在高压设备供电领域的应用提供了参考依据。

卫星遥控指令传输时延测试方法

地面测试阶段通过发送遥控指令对卫星的功能、性能进行全面验证。其中机构运动、火工品起爆、阀门的开关等测试项目对指令执行时间有严格要求,因此,需要准确测量遥控指令传输时延,精确控制遥控指令执行时间。针对上述问题,提出了一种利用网络封包分析软件(Wireshark)结合综合基带设备(Cortex)测试遥控指令传输时延的测试方法,分别测量网络通道设备时延和射频通道设备时延,分析了测试误差,该方法操作简单,精度高,可为其他卫星遥控指令传输时延的测量提供参考,具有工程实践意义。

武汉光谷大悦城高效制冷机房设计总结与探讨

从负荷计算、冷源设备配置、输配系统、控制策略等方面介绍了武汉光谷大悦城购物中心高效制冷机房的设计。该项目采用一级泵变流量系统,制冷机房全年平均设计能效比为5.2,制冷机房运行能效比达到5.54。对高效制冷机房能效比进一步提升的路径和手段进行了总结与探讨。

资源分布视角下区域保障调度模型研究

区域作战中,装备保障需求呈现出一定分布特征,保障供应也随时动态变化,如何匹配供需进而进行保障调度成为提升区域保障能力的关键。针对区域资源供需的分布特性,运用最优传输理论,建立资源分布视角下区域保障调度模型。首先,构建分布视角下的区域保障调度基本模型,考虑决策层级将其拓展为多分辨率模型,然后基于sinkhorn算法提出保障调度概率方案作为转换,进而给出多分辨率模型的保障调度方案求解算法。案例分析表明,非指数分布和自由竞争环境下,保障调度方案具有鲁棒性。

知识图谱在输变电设备运维中的应用

对输变电设备海量数据进行有效利用和管理是新型电力系统信息化发展的重要方向,挖掘电网输变电设备运维数据,并感知其运行态势,可保障输变电设备安全稳定的运行。该文将知识图谱引入输变电设备运维领域,分析输变电设备运维的数据情况和现存问题;介绍输变电设备数据融合聚类技术和运维知识图谱的构建技术;结合输变电设备运维特性,总结知识图谱在输变电设备运维中的典型应用场景;分析当前研究热点,探讨知识图谱在输变电设备运维领域的关键问题,并展望该领域的发展前景。运用知识图谱,在提高企业维修效率的同时,还能降低人力成本。

基于深度学习的电力杆塔缺陷检测

针对目前无人机电力杆塔巡检过程中航拍图像背景复杂、杆塔组件尺寸差异大、缺陷种类多导致的巡检效率低和缺陷漏检率高等问题,本文提出一种动态位置查询引导的多尺度实例分割方法和基于图特征记忆的缺陷检测方法。所提实例分割方法通过提取多尺度航拍图像特征,选择特征中具有最高关注度分数的低分辨率像素,将其映射到高分辨率特征的相应位置,并添加边界框检测器以提高电力杆塔的分割精度。在缺陷检测算法中提出可学习的图特征描述符,构建了一个记忆库来提取关键元素,以获得更准确的样本特征,提高缺陷检测效率。本文方法在自建的两个缺陷检测数据集上与其他先进算法进行对比,实例分割box_AP和mask_AP相较于Mask2Former分别提升了7.6%和0.5%,缺陷检测算法AUROC分别比次优算法提高7.3%和1.6%,F1-Score分别比次优算法提高6.7%和6.9%,充分表明了本文算法出色的电力杆塔缺陷检测性能。

周期桁架结构设计及振动特性分析

为解决船舶动力系统低频振动噪声问题,本文基于声子晶体局域共振理论,设计了一种带周期振子桁架式浮筏结构。利用有限元法和Bloch理论,分析了周期振子桁架产生带隙的原因,讨论了振子质量、安装形式和桁架结构参数对带隙特性的影响规律,设计了周期振子桁架振动特性试验,探究了桁架结构振动传递特性。结果表明:振子质量越大,带隙宽度增加,胞元尺寸越大,带隙带宽减小;振子排列方式对带隙特性影响较小,增加振子数量,宽带特性显著;采用振子间隔安装方式,相较全安装方式,带隙特性变化较小,可有效减少振子数量。

基于结构变形理论的深海连接器O形圈密封性能研究

深海连接器是保证海洋装备能够正常运行的信号传输设备,而深海连接器的正常运行在很大程度上依赖于O形圈的密封性能。为此,对深海高压环境导致O形圈发生形变,从而严重影响O形圈的密封性能问题进行了研究。首先,基于结构变形理论,分析了环境压力对于密封结构变形和O形圈压缩量的影响变化;然后,基于有限元法建立了O形密封圈的非线性动密封模型,分析研究了模型网格划分对于模拟结果准确性的影响;接着,分析了结构变形与环境压力之间的关系曲线;最后,研究分析了材料性能、环境压力与密封结构尺寸对于动密封性能的影响。研究结果表明:当网格的实际值为47745,测定值为21685、37934、50707时,其模拟计算结果的误差值均小于2%;密封结构变形和O形圈压缩量的模拟值与理论值的曲线趋势基本一致;材料性能与环境压力的变化会影响动密封性能,在密封结构尺寸中,增大沟槽圆角半径可以增强O形圈的动密封性能。该研究结果可为深海高压环境下O形密封圈的设计与优化提供参考与理论支持。

广播电视信号传输系统的维护和管理

随着技术的发展,广播电视信号传输系统已成为现代社会信息传播的重要工具。对其进行有效的维护和管理,有助于保障传输稳定性,提升观众体验,预防潜在风险,降低运营成本。当前,广播电视信号传输系统的维护和管理面临着设备老化、维护人员技能更新不足、维护流程不标准化等问题。针对这些问题,文章提出一系列优化策略,以期提高广播电视信号传输系统的稳定性和维护效率。

一种基于QFD/TRIZ的高压铁塔微桩成型装备设计

高压输电线路铁塔常位于地形条件苛刻、地质条件复杂、气象状况多变的地区,这使得大型钻孔设备难以到达施工现场,基坑开挖大多只能采用人工挖掘,但人工挖掘难以挖出变直径桩孔。为了减轻人工强度和施工风险并提高施工效率,提出了一种成孔设备设计方案。首先,分析了对当前桩孔钻进施工的现状以及其中存在的问题与用户需求;然后,通过质量功能展开方法从得到的用户需求中发掘出产品设计要求;最后利用发明问题解决理论求解设计要求的冲突,得到组合式变径成孔设备方案。该方案将实现成孔设备的可便捷拆卸装配以及连续变径成孔等功能,可有效地提高变径桩成孔施工的效率和安全性,相对于人工桩孔挖掘具有明显优势。