华中华北联网及安阳变电所过渡方案研究

华中与华北联网是全国联网南北互供的主通道之一，是全国北部电网与中部电网的重要联网工程。经过系统论证，华中华北联网宜采用先交流，后过渡到直流背靠背的方案。安阳变电所是华中华北联网工程中的关键变电站，其电气接线方案、配电装置、站用电接线等既要满足近期的联网要求，又要适应远期直流背靠背换流站的要求。因此，安阳变过渡方案的研究对于联网工程显得尤为重要。文中对安阳变电站的过渡方案进行了深入细致的研究，提出经过优化的过渡方案，能更好地适应华中华北联网先交流、后直流的分步实施要求。     

基于计算资源效率分配的多种群中心解搜索电网规划算法

分析了现代启发式算法易陷入局部最优及计算效率不高的原因，提出了计算资源依搜索效率合理分配的全新概念。给出了多种群中心解搜索电网规划算法。该算法基于多解群按效率获得计算资源，借鉴免疫算法的记忆细胞设置，但改点记忆为面记忆，具有更高的记忆效率，能够有效地识别并记忆局部最优解，利用对解间距离的信息熵量度，抑制搜索陷入局部最优，具有优秀的局部搜索能力和全局搜索能力。算例表明该文算法的有效性。     

中央空调系统管材的腐蚀与防护

中央空调系统管材的腐蚀会对空调的安全运行造成严重的后果.文章论述了中央空调水系统、冷冻液溴化锂系统管材常见的腐蚀破坏形式及危害,并结合国内外近年来实际空调运行经验,提出了防止这些腐蚀的方法,对中央空调安全经济运行提供了依据.     

我国中央空调的节能潜力预测

本文建立了中央空调节能预测模型.假设实施了中央空调能效标准,利用这一模型预测了2003年至2020年中国中央空调的节能量,2020年CO2、SO2、NOx及粉尘的累计减排量.分析了制定中央空能效标准的必要性以及实施这一标准有可能获得的好处.     

基于LonWorks的低压电力线载波通信技术

介绍了LonWorks现场总线技术的基本概念和特点，以及Neuron芯片的原理和管脚信息。详细阐述了Echelon公司的PL-22电力线载波收发器模块的电气特性，提出了基于LonWorks技术的低压电力线载波收发器的实现方法。     

Neuron芯片多总线I/O对象的应用

介绍Neuron芯片的特性、基本系统和应用电路，给出了多总线I/O对象在分体空调集散控制中的应用实例。     

Development of the bus joint for the ITER Central Solenoid

The terminations of the Central Solenoid (CS) modules are connected to the bus extensions by joints located outside the CS in the gap between the CS and torodial field (TF) assemblies. These joints have very strict space limitations. Low resistance is a common requirement for all ITER joints. In addition, the CS bus joints will experience and must be designed to withstand significant variation in the magnetic field of several tenths of a Tesla per second during initiation of plasma. The joint resistance is specified to be less than 4 nΩ.The joints also have to be soldered in the field and designed with the possibility to be installed and dismantled in order to allow cold testing in the cold test facility. We have developed coaxial joints that meet these requirements and have demonstrated the feasibility to fabricate and assemble them in the vertical configuration. We introduced a coupling cylinder with superconducting strands soldered to the surface of the cable that can be installed in the ITER assembly hall and at the cold test facility. This cylinder serves as a transition area between the CS module and the bus extension.We made two racetrack samples and tested four bus joints in our Joint Test Apparatus. Resistance of the bus joints was measured by a decay method and by a microvoltmeter; the value of the current was measured by the Hall probes. This measurement method was verified in the previous tests. The resistance of the joints varied insignificantly from 1.5 to 2 nΩ.One of the challenges associated with a soldered joint is the inability to use corrosive chemicals that are difficult to clean. This paper describes our development work on cable preparation, chrome removal, compaction, soldering, and final assembly and presents the test results.     

精密空调在企业小型机房的应用及维护

企业小型计算机房对机房专用空调的需求不断增长，机房专用空调的类别及特点，小型机房对专用空调的运行要求，机房精密空调的使用及维护。