变压器检修的电源倒换

在厂用电系统进行变压器检修或倒负荷时,通常会进行合环操作,其中判断合环条件是否满足是电厂运行人员的一项重要任务.本文首先对变压器理想情况下并列运行的条件进行了简单介绍,之后对这些影响变压器并列运行时线路负荷分配以及环流的条件进行了详细分析.     

电力变压器经济运行方式分析与探讨

以30kVA和100kVA两台变压器为例，对电力变压器不同负荷下的损耗进行了分析，探讨了在各种条件下电力变压器应选择的经济运行方式     

株冶主供动力变压器效率的分析与提高

本文通过对株冶4台主供动力变压器经济负载区的分析推导，阐述了在利用现有设备基础上，调整其容量与负荷的达配状况，提高变压器运行效率的可行性和, 分析了负荷调整后的效果与效益。     

连接组别不同变压器并联运行的特例

变压器并联运行有很多优点：可以提高供电可靠性，即当一台变压器发生故障退出运行后，另一台变压器仍可继续供电；可以提高运行经济性，即根据负荷变化投、切变压器，以减少损耗，提高经济效益；可以根据负荷发展分期安装变压器，减少初期投资。变压器并联运行一般应具备如下三个条件：①变比相等，且一、二次额定电压分别相等，这样就没有环流；②短路电压的标么值相等，且其电阻分量压降和电抗分量压降也分别相等。这样负载才能按各台变压器容量大小成比例分配；③连接组别相同，这样各变压器的二次电压同相位。但是，本人在一基层单位工…     

利用补偿装置提高设备带载能力

针对公司两台220kV变电站站用变压器在一台变压器检修时,另一台变压器带站内所有负荷时,就会出现过负荷,变压器温度升高等现象,本文提出了采用更换变压器和增加无功补偿装置两种方案,通过两种方案对比,最终采用增加无功补偿装置方案,实施后,获得了较好的效果。     

金隆公司主变压器运行方式及经济运行计算

本对金隆总降压变电所2台主变压器的经济运行方式进行了计算，介绍了自投料生产以来变压器的运行方式，并对现行2台变压器的分列运行方式是否合理，经济进行了计算和验证。     

金堆城钼业公司机电修配厂概况

机电修配厂是金堆城钼业公司配套工厂,占地面积89300m~2;厂房建筑面积47700m~2;固定资产原值8190万元,其中任家滩水库3100万元、设备原值1524万元;设备拥有量789台(套),其中主要设备15台(套)、工业炉窑26台(套)、桥式吊车24台;变压器装机容量9770kVA;最大负荷5640kW,平均负荷4200kW.     

ТДГ3．15万kVA主变压器经济运行分析

根据电力变压器功率损耗的分析，找到ТДГ3．15万kVA2台主变压器的功率损耗与负荷率β的函数关系，并对该2台主变压器的经济运行进行了探讨，计算出了经济运行点。     

浅谈变压器经济运行方式

１前言金隆公司总降压变电所装有两台１１０／６．３ｋＶ２５０００ｋＶＡ双线圈变压器,设计要求正常生产时两台变压器全部投运,且分列运行,当其中一台变压器故障时,６．３ｋＶ分段开关自投,另一台变压器担负全部负荷,这样的运行方式是合理的,由于受两部制电价的约束,为减少基本电费开支,不得不改变运行方式。变压器究竟采用何种方式运行,现提几点粗浅看法。２变压器的经济运行所谓变压器的经济运行,就是变压器在最小损耗工况下工作。变压器的损耗有两种：空载损耗和短路损耗。在正常运行情况下,空载损耗基本不变,即不随负荷变…     

我厂变压器经济运行方式探讨

我厂总降压变电所有2台20000kVA主为顺；二级降压变压器有94台，总容量达到106359kVA。由于受中制电价的约束，主变压器采用何种方式运行电费最省、又安全成为十分重要的问题。本从主变压器的运行费用考虑变压器的运行方式和变压器的经济运行两方面分析研究解决该问题；同时也为二级降压变压器的经济运行提供了理论依据。这是一个不花投资，通过利用现有设备，选择最佳运行方式，调整或更换变压器的方式方式，在相同电量的情况下，达到节约电费支出，提高经济效益的目的。     

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.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.