国产隔爆型移动变电站故障浅析

分析国产移动变电站常见故障，指出引起变压器绕组损坏的主要原因，并提出相应的改进措施。     

英国BRUSH 3.3kV移动变电站的使用及改造

介绍英国BRUSH 3.3kV移动变电站的引进、使用情况、损坏情况、结构特点、原因分析及改造提升。     

1000KVA矿用隔爆型移动变电站

文章详细介绍了国产的1000kVA矿用隔爆型移动变电站的适用范围和使用条件以及移动变电站的结构特点.     

谈国产移动变电站低压馈电开关的调试

就KSGZY型移动变电站漏电闭锁电阻和漏电动作电阻的调试、半导体脱扣器中过流保护整定计算和低压馈电天关试验台电气原理、移动变电站低压馈电开关安全保护装置的漏电和过流保护的正确调试和整定作了介绍。     

馈电开关替换可行性分析

介绍了移动变电站的组成及用ＤＷ８０ 型馈电开关代替移动变电站低压馈电开关在现代机械化采煤工作面应用中所产生的弊端。     

国产移动变电站高低压开关的改造

煤矿井下原使用的国产移动变电站高压开关为空气负荷开关，不能分断故障电流，低压侧为真空馈电开关，故障频繁。大同矿务局与北京四博联化能机电设备厂联合研制的移变用高压开关为真空断路器，低压侧为不装设馈电开关的电气保护箱，低压侧如发生故障，可使高压侧断路器跳闸断电。     

KSGZY型移动变电站使用经验

<正> 我矿于1985年5月进行国产综采成套设备工业性试验时使用KSGZY型移动变电站,现井下日常生产使用10台左右,容量有1000、800、630、500、315kVA,在生产中发挥了很大作用,还替代了部分进口设备。本矿1981年11月建成投产时全部使用进口综机设备,所以开始时使用国产移动变电站,对其性能、质量抱有怀疑态度,但是通过多年的使用和维修,不断的熟悉其性能,对如何使用好设备摸索了些经验。实践证明此系     

Brush 1500kVA移动变电站的原理及应用

移动变电站由高压开关箱、干式变压器和低压开关箱组成,它是煤矿综采工作面必备的供、变电设备。其发展方向为大容量、高电压组合,高低压侧的开关箱由于采用了先进的计算机控制技术,使得移动变电站整个系统的检测、控制和保护等性能更加完善和合理。     

BGZ2—6／Y矿用隔爆型高压真空开关简介

ＢＧＺ２—６／Ｙ矿用隔爆型高压真空开关简介沈阳科达有限公司张乃武本产品是用于煤矿井下移动变电站高压侧配套的新型开关。配用本开关的移动变电站专用型号为ＫＢＳＧＺＹ１。目前，我国煤矿井下使用的国产移动变电站高压侧配用的全部是负荷开关。这类开关开断性能低，...     

隔爆移动变电站存在问题及解决措施

升井后隔爆移动变电站检修发现高压开关存在一定的技术缺陷。分析原因,及时改进工艺,应用新技术,对于保证矿用隔爆移动变电站的安全稳定运行非常重要。本文针对防爆干式变压器、防爆开关等存在的问题,提出了解决问题的技术措施。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。