增压风机变频器故障分析及系统改进对策探讨

通过对一起高压变频器多个功率单元严重烧损故障的原因分析，指出了系统设计上存在的缺陷，提出了增加接地故障检测、提高绝缘水平、增加自动切换功能等有效对策，提高了变频系统的保护功能，为发电机组辅机高压变频系统可靠运行提供了有力支撑。     

综合保护在八钢板带涂镀的应用

板带工程涂镀项目的高压供电系统 ,原设计采用常规继电器保护 ,为进一步提高板带涂镀项目配变电站自动化程度、自动化水平、设备装备水平、高压保护系统的可靠性 ,适应高压保护系统的发展的需要 ,对常规继电器保护的设计进行了修改 ,选定了综合自动化保护系统。该系统可实现高压供电系统真正意义上的无人值守 ,实现智能通讯管理。通过计算机实现控制功能、数据采集功能、屏幕显示功能、报表记录打印功能、事件信息功能、报警功能、四遥功能、高压柜的五防锁闭功能 ,提高高压供电系统运行的可靠性     

脱碳退火工艺对取向硅钢碳含量的影响

采用高温管式炉研究脱碳温度、时间、气氛和加湿器温度等工艺对取向硅钢脱碳效果的影响,探讨了取向硅钢碳含量控制的最优工艺条件。试验结果表明,当温度为840℃、时间8min以上、H2∶N2的比例为30%∶70%和加湿器温度为65℃时,能取得较好的脱碳效果。     

攀钢2#镀锌铝线退火炉的特点

退火炉是镀锌铝线的核心设备，本文重点从退火炉控制、辐射管、带钢纠偏、炉内气氛分析特殊阀门的自测试、加湿器的使用等几个方面进行探讨。     

综合自动化技术在烧结厂高压配电站的应用

介绍了南钢烧结厂高压配电室改造的方案，微机自动化系统的构成、基本原理、系统功能，探讨了实现无人值守的可能性。     

分散式变电站综合自动化系统

本文简介了高压控制回路的现状，着重介绍了分散式变电站综合自动化系统的组成、功能、特点。     

变频调速技术在济钢焦化厂高压氨水泵上的应用

济钢焦化厂高压氨水泵变频调速系统采用变频器和PLC相结合的方式 ,具有调速精度高、节能等多种功能 ,保证氨水泵正常工作。全年可增加经济效益 77.3万元。     

高压笼型液体电阻起动器的改进和性能提升

为满足不同应用场合和负载的要求，对传统的高压笼型液体电阻起动器的起动方式进行了改进。改进型的高压笼型液阻起动器采用了多种起动方式及保护功能，更加适应不同负载的起动要求。     

300MW高压加热器U形传热管材料研究

电站加热器传热管的泄漏是影响其投运率的主要因素，也是高压加热器最易损坏的部位，是决定高压加热器使用寿命的主要部件，为提高高压加热器的使用寿命，本文对传热管材料进行了研究和分析，提出了采用15Mo3低合金钢管和VLX439L铁索体焊接不锈钢管和SA688奥氏体焊接不锈钢管，以增加管系使用寿命，减轻使用中的维修工作，从而提高整台发电机组的效率。     

变电站电力监控系统升级改造

济南鲍德气体有限公司对变电站电力监控系统进行升级改造,增加故障录波、远程自动抄表、模拟仿真、谐波采集等扩展功能,将各变电站后台微机联网,将现场信息通过智能通讯服务器上传到电力监控系统的集中控制中心,实现了高压设备的系统管理。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

Shijiazhuang will Build the World's Biggest Replacingcopper-with-aluminum Cable Production Base

正Shijiazhuang City will build the world’s biggest replacing-copper-with-aluminum cable production base,the annual output value can reach 100 billion yuan,in the future it will develop replacing-copper-with-aluminum highend industry cluster.This piece of news was learned by the reporter at the Rare Earth highiron Aluminum Alloy[Nonferrous Business Opportunity:Aluminum alloy door]Cable Conductor New Technology Application Seminar held at the provincial capital.     

Chongqing is Preparing to Set Up Nonferrous Metal Exchange,in a Bid to Become the Transit Place of Kazakhstan Copper

正Since the beginning of Chongqing’s upgrading to a municipality directly under the Central Government,Chongqing City has established direct friendly relationship with Almaty,Kazakhstan,and carried out a series of cooperation in commerce and trade,and culture     

Guangxi Baise Extends Industrial Chain to Combat Loss in Aluminum Business

正"For each tonne of aluminum being produced,the upstream enterprise on the aluminum industrial chain will suffer loss about 2000yuan."Said Liang Xiao,Deputy Director of Pingguo Industrial Park Management Committee under the Guangxi Baise City,one of the four major aluminum industry bases in China,on August 11.Extending aluminum     

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL ANNUAL CONTENTS Volume 21(2014)

正~~     

Chinalco Straightened Out Copper Assets,and Delegated Stock Equity of Yunnan Copper

正Immediately after the news that Chinalco transferred 58%stock equity of Yunnan Copper Group to its wholly-owned subsidiary China Copper Corporation Limited free of charge was disclosed on July 9,many individual investors couldn’t help but to think:Does it mean China Copper Corporation Limited will assemble assets for overall listing?At present,among main copper business companies under China Copper Corporation     

The Development and Reform Commission Encourages Private Capital to Enter Geological Prospecting Field

正At the press conference recently held by the National Development and Reform Commission under the theme"Deepen Reform in Investment AuditApproval System",when answering questions from reporters,Huang Min,Director of the Department of Fixed Assets Investment of the National Development and Reform Commission,said that in the future it would continue to intensify efforts in geological prospecting,and actively guide social capital to enter this field.     

Guangxi's first Nickel Industry Development Research Report Was Released

正Recently,Guangxi Metallurgical Research Institute,a subsidiary of Guangxi Nonferrous Metals Group,completed survey on laterite and related manufacturers in the region,by combining the current development status of laterite both at home and abroad,it compiled Guangxi’s first"Research Report on the Development of Guangxi Nickel Industrial Chain"which adopted laterite as the study subject.This report expounded on the current     

China’s Major Non-ferrous Metals Imports & Exports(End of September. 2014)

正~~     

China's Major Non-ferrous Metals Imports & Exports

正~~