通风机的选型与应用

风机是依靠输入的机械能,提高气体压力并排送气体的机械,它是一种从动的流体机械。 风机广泛用于工厂、矿井、隧道、冷却塔、车辆、船舶和建筑物的通风、排尘和冷却;锅炉和工业炉窑的通风和引风;空气调节设备和家用电器设备中的冷却和通风;谷物的烘干和选送;风洞风源和气垫船的充气和推进等。     

《湖南省电力设施保护和供用电秩序维护条例》及释义(三)

<正>第八条对在电力设施保护和供用电秩序维护工作中做出显著成绩的单位和个人,县级以上人民政府及有关部门应当给予表彰和奖励。【释义】本条是对电力设施保护和供用电秩序维护工作激励机制的规定。行政奖励是指行政机关依照法定条件和程序,对为国家和社会做出重大贡献的单位和个人给予物质和精神鼓励的行政行为。其目的是表彰先进,调动和激发人们的积极性和创造性。本条规定,对在电力设施保护和供用电秩序维护工作中做出显著成绩的单位和个人县级以上人民政府及     

构建南方电网标准设计和典型造价应用管理平台

标准设计和典型造价应用管理的一体化和信息化是提高应用管理水平的有效手段。本文介绍了南方电网标准设计和典型造价应用管理平台的开发和应用,探讨了标准设计和典型造价应用管理的先进手段和发展趋势。     

新的就一定是好的吗？

一些传统家电产区的产业转型升级和家电产业基地地位的巩固受到了巨大挑战,当地政府和企业感到了巨大压力和焦虑。这种压力和焦虑应该缘自这些产区的家电行业有影响的品牌企业数量偏少,总体规模和单位规模偏小、企业和产品核心竞争力偏弱,企业综合素质和实力偏低;     

智能变电站通信网络时间性能的探讨

阐述智能变电站通信网络和系统的时间性能概念及其重要性,为智能变电站通信网络和系统的运行维护提供可测量、可分析的方法和手段。依据智能变电站通信网络和系统标准定义的一致性测试方法和范围,研究讨论其测试方法的重要性,通过测试手段和方法的分析和描述为智能变电站通信网络和系统定义基本的时间性能要求。同时阐述评估智能变电站通信网络和系统的时间性能指标,为更好地掌握智能变电站通信网络和系统的时间性能提供全面的分析方法和检测依据。     

第十二届保护和控制学术研讨会征文通知

为探讨保护和控制理论和技术新思想,研讨保护和控制理论及技术应用的现状及发展,交流保护和控制的科研成果、设计、运行和维护的经     

谈期刊论文的文摘和关键词

阐述了对期刊论文编写报道性文摘和选择关键词的方法.为提高文摘的准确性和完整性,节约社会劳动和费用,以及保证建立数据库和出版文摘杂志的及时性,建议由论文作者自写文摘和选择关键词。文摘有目的、方法、结果和结论等基本要素.在写作报道性文摘时,结果和结论两个基本要素是重点,在选择关键词时,首先分析主题类型和主题结构,第二步提炼显见和隐含的概念,并确定关键词。文中对文摘和关键词的定义、意义和作用、文摘写作的步骤和注意事项作了详细介绍。对译名的统一提出了建议.     

再试试“抱团”发展?

一些传统家电产区的产业转型升级和家电产业基地地位的巩固受到了巨大挑战,当地政府和企业感到了巨大压力和焦虑。这种压力和焦虑应该缘自这些产区的家电行业有影响的品牌企业数量偏少,总体规模和单位规模偏小、企业和产品核心竞争力偏弱,企业综合素质和实力偏低;应该缘自其他家电产业基地的不断突破和     

创新基因成就ABB

创新是人类前进和发展的最根本动力,而作为全球领先的电力和自动化技术供应商,ABB的发展和竞争力的提升更是建立在高强度和持续的创新基础之上,这一点从它的发展历程和在最困难的时刻对创新的态度就可看出。     

纳米二氧化钛复合材料应用于空调健康功能研究

本文对应用于空调换热器和过滤网上的纳米二氧化钛和银离子复合材料的健康功能进行了研究,结果表明,这种复合材料能够使空调换热器具有自清洁功能,能防止蒸发器和冷凝器发霉和被腐蚀。换热器和过滤网上均大量使用纳米二氧化钛和银离子复合材料后,空调的整机模拟真实环境杀菌和去除甲醛的能力较强。     

Conventional and recommended arc power and energy calculations and arc damage assessment

The costs associated with fires initiated by arcing faults depend on the extent of the damage. In some cases, costs have exceeded $100 000 000. The personal losses associated with a serious injury or fatality are incalculable. When an arcing fault occurs, qualified in-house personnel and/or professional consultants try to determine the factors involved in the fault's initiation. Investigators also serve as expert witnesses in any pending lawsuits related to the accident. In fact, the growing interest in accident investigation has led to the establishment of an IEEE workgroup in forensics. Even with sophisticated techniques like scanning electron microscopes used to provide magnified photographs of arc damage, only a limited amount of applicable technical information on arcing faults exists for reference. Much of the engineering reference information on calculating arc currents and assessing arc damage is 25-50 years old. Recent papers by the authors discussed calculating arc currents. This paper presents a method to determine the power released by a single-phase-to-ground arc and provides graphs for quick reference. Commonly used methods for calculating arc power and energy and quantifying damage are also discussed. The recommended and conventional methods are used to determine arc energy and to identify the damage threshold in a typical system and the results are compared.     

谐波及其危害与治理

从谐波的基本概念开始,阐述了谐波基本指标,谐波的危害、谐波的限制措施、谐波测量以及谐波治理等方面的知识并作了具体的分析。     

Present and Future Trends and Needs in Electric Power Quality Sensors and Instrumentation

Sensors and instrumentation systems form an important part of power quality assessment and preservation. In this paper, the present and future trends in power quality instrumentation are discussed and the present capabilities are identified (e.g., bandwidth, dynamic range, quantities measured). Innovative methods of instrumenting nonsinusoidal voltages and currents are described, including applications of the Global Positioning System (GPS), solid state sensors, sensors that involve light and video, advanced data compression techniques, and advanced state estimation. The cost-to-benefit ratio of sensor development is evaluated in the context of the deregulated electric utility business environment.     

Tracing active and reactive power between generators and loadsusing real and imaginary currents

In a competitive environment, usage allocation questions must be answered clearly and unequivocally. To help answer such questions, this paper proposes a method for determining how much of the active and reactive power output of each generator is contributed by each load. This method takes as its starting point a solved power flow solution. All power injections are translated into real and imaginary currents to avoid the problems arising from the nonlinear coupling between active and reactive power flows caused by losses. The method then traces these currents to determine how much current each source supplies to each sink. These current contributions can then be translated into contributions to the active and reactive power output of the generators. It is also shown that the global contribution of a load can be decomposed into contributions from its active and reactive parts. This decomposition is reasonably accurate for the reactive power generation. To determine the contributions to active power generation, the previously-described method based on the active power flows is recommended     

德、法两国报刊、图书出版业考察有感

阐述了德、法两国报刊、图书出版业的发展趋势和概况,通过对欧洲书展和法、中文化交流活动的介绍,分析了德、法两国报刊、图书出版业的特点。结合宁夏的实际情况,借鉴国外先进经验,提出了本地区电力行业科技期刊的发展模式及思考。     

Generator protection and CT-saturation problems and solutions

This paper presents a new generator relay design, stator differential function in particular, coping with extreme cases of current transformer (CT) saturation: both ac saturation under large currents and/or residual flux; and dc saturation under low currents but large and long-lasting dc components. The algorithm is a subcycle algorithm with fastest times reaching half a cycle including overall response of the relay hardware. Analysis of the response of a traditional differential function under CT saturation is included to provide setting guidelines for legacy relays.     

SF6断路器巡视维护及常见故障原因分析与处理

SF6断路器是电力系统中的一个重要设备。在110kV及以上电压等级中,最常用的开断电器是SF6断路器。介绍了其特点,总结了正常巡视检查定期维护的方法,分析了产生故障的原因,并提出了在出现常见故障时采取的措施,为电网运行管理部门预防该类事故提供参考,从而确保安全优质持续供电。     

变频器与PLC的连接与配合使用

分析了变频器和PLC的配合使用的连接方法,提出了设计安装使用时的注意事项,给出了抗干扰的一些方法。     

发输电系统鲁棒优化规划研究综述与展望

随着电力系统不确定性增加,应用发输电系统鲁棒优化规划研究抵御不确定性极端场景已成为重要研究方法。首先从是否计及不确定因素概率分布特征角度,将鲁棒优化分为经典鲁棒优化和分布鲁棒优化,梳理了这2类鲁棒优化的数学模型和不确定集合特征。然后将现有的发输电系统经典鲁棒优化和分布鲁棒优化研究分为考虑节点注入功率不确定性、电源容量增长及成本不确定性、输电网络状态不确定性3个方面,提炼了发输电系统鲁棒优化规划的研究框架和局限性。最后展望了发输电系统鲁棒优化规划值得深入研究的问题,为发输电系统鲁棒优化规划后续研究提供思路和方向。     

星载多模式和多通道图像采集与处理

为了获取遥感卫星相机多模式与多通道的遥感影像,提出了星载多模式和多通道图像数据采集与处理系统的设计及实现方法,可将卫星在常规模式与降轨模式下的多通道图像数据采集并传输给存储系统,解决了现有星上存储单机无法并行存储多路数据的问题。设计了可兼容常规模式和降轨模式的多通道图像采集模块,将采集到的图像数据进行多模式图像处理,通过轮询调度算法实现多路图像归一化处理,最后通过Aurora64/66b传输协议将经过处理的图像数据传输给存储系统,完成了数据的高效采集与处理。经过实验测试,系统数据采集传输速率可达9.2 Gb/s,采集数据准确,零误码。系统稳定可靠、实时性好,满足实际卫星使用需求。