轧机主传动交流传动装置方案比较

简单介绍了用于轧钢机主传动的大容量、高性能交流传动装置。重点对交－交变频传动、交－直－交三电平电压型PWM变频传动、负载换向变频传动等几种主回路接线方案的技术特点进行了分析比较。     

40CrNiMo钢微观组织对疲劳短裂纹扩展的影响

介绍了山西省太原城南变电站的主接线及建设规模，配电装置，自动化系统。分析了无人值班的先进性以及存在问题和建议。     

变压器差动保护相量测试

根据接线方式为Y/△-11的变压器差动保护现场接线方式,叙述了其相量测试方法及其现场测试的注意事项。     

一起110kV主变保护综自改造隐患处理

对晋城市自来水公司一水厂变电所110 kV主变在保护改造中由于接线方式特殊造成无法正常调试的问题进行分析和改进.通过改进保护装置对接线系数,使得调试工作在不更换一次设备的的情况下顺利进行,从而保证了系统的安全运行,消除了一水厂变电主变运行的严重隐患,同时确保了一水厂变电所的按时送电.     

铜冶炼电热沉降炉电气系统的改进

铜冶炼电热沉降炉电气系统存在谐波超标;现场高压开关柜内真空灭弧室炸裂和避雷器烧损严重;变压器功率波动大;系统功率因数低等问题。通过增加并联电容器吸收谐波电流、改变6 kV回路的配置接线降低截流过电压和控制工艺参数等方法,解决了上述问题,实现了电热沉降炉变压器安全经济平稳运行。     

城市变电站一次设计分析

对城市变电站电气设计中主变压器的选择、电气主接线的确定、高压电气接线设计、电气设备选择等作了论述,通过合理计算和论证,从而达到城市变电所电气设计安全、可靠和经济的目的.     

垃圾焚烧发电厂电气主接线形式及运行方案的探讨

垃圾焚烧发电厂属小机组电厂,一般机组出力为9 MW~25 MW不等,针对这样小容量机组的电厂,其全厂电气主接线形式与大容量火力发电机组相比有其自身的特点。本文结合深圳市宝安区白鸽湖垃圾焚烧发电厂电气主接线的实际设计范例,介绍了小容量机组电气主接线形式选择的设计思路,并提出了自己观点进行探讨。     

Profibus-DP现场总线在电机驱动设备中的应用

针对传统工厂建设项目中驱动设备采用硬接线存在的问题,介绍了刚果（金）RTR项目将Profibus-DP现场总线应用于电机驱动设备与控制系统进行信息交换的实际情况,详细分析了该现场总线在电机驱动设备中的信息接入方式、关键技术要点、项目配置及实施原则。实践证明,该项目投产以来,控制系统、Profibus-DP总线网络、驱动...     

三相电能计量装置的误差及改进

从三相电能计量的现场实际接线方式、测量回路互感器及仪表与负载匹配情况,分析影响电能计量的准确度和误差存在的原因,提出了解决误差的有效方法。     

110kV线路变压器组差动保护实现方式分析

在110 kV输电系统中,与单母线接线及桥型接线相比,线路变压器组接线方式由于接线简单、占地较少、节省投资,在钢铁企业配电系统中广泛应用。110 kV线路变压器组接线方式下的110 kV线路和主变压器差动保护实现方式有别于常规线路与主变压器保护,通过分析常见的110 kV线路变压器组差动保护实现方式,比较各种实现方式的利弊,得出推荐的实现方案。     

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。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.