6kV配电线路雷区防雷措施

６ｋＶ配电线路雷区防雷措施鹤壁矿务局供电处张宝庆，朱秀荣我局所属的电力线路中，属供电处维修的输配电线路有１７６ｋｍ，其中：３５ｋＶ级以上的５７ｋｍ，６ｋＶ线路１１９ｋｍ。关于线路的防雷保护问题，３５ｋＶ以上的线路按设计规程的要求采用架空地线保护，６ｋ...     

浅论高压开关设备的发展

随着电力系统发展,高压开关设备的发展方兴未艾,呈现出一种从概念到工作原理、从制造技术到工艺设计全方位并进的局面。煤炭行业近年来也在设计中大量使用高压真空开关、真空接触器。为了使供配电专业的同行了解高压开关设备的发展状况,特写此文。开关设备按其额定电压一般分为高压（３５ｋＶ以上）、中压（３５ｋＶ—６ｋＶ）、低压（６ｋＶ以下）。电力系统中高压开关设备一般指额定电压３５ｋＶ以上的开关,而煤炭行业中高压开关一般指额定电压在６ｋＶ以上的开关。本文所指为后者。１　高压开关设备的现状在我国输配电系统中,６０年…     

35 kV变电站安全操作技术

３５ｋＶ变电站安全操作技术山东矿业学院济南分院孟祥忠关键词高压开关装置３５ｋＶ变电站安全操作闭锁装置“五防”改造１概述随着电力事业的蓬勃发展，对安全供电的要求显得更为重要。我国工矿企业３５ｋＶ变电站内的高压开关装置中，有很大一部分缺少或安全没有安全操...     

SF_6组合电器在我矿的应用

济宁三号煤矿是一座年产５Ｍｔ的大型现代化矿井,矿井变电所１１０ｋＶ侧选用北京开关厂生产的ＺＦ４－１１０／３１．５型ＳＦ６组合电器（ＧＩＳ）。１９９８年３月起正式运行。ＧＩＳ是由ＺＦ４－１１０Ｄ断路器、ＺＦ４－１１０Ｇ隔离开关、ＺＦ４－１１０Ｍ母线、Ｚ...     

一种永磁磁路设计的新方法

本文从永磁磁路设计的基本公式出发，从理论上讨论了永磁体的一个计算公式μ０Ｈｇ＾２＝１／ｋｆｋｒ（－ＨｍＢｍ）Ｖｍ／Ｖｇ，可以表示为μ０Ｈｇ＾２＝１／ｋ（ＢＨ）ｍＶｍ／Ｖｇ，若用已知性能的磁性材料做成一定形状磁体，测量其几何参数及Ｈｇ，即可按上式求出ｋ，然后把ｋ值作为此种形状磁体的校正系数，就可以方便地求出用其它磁性材料设计这种磁体所需材料的最小体积。这样为使用新磁性材料设计磁路提供了一个简捷的方法     

JY82－2／3检漏继电器的改进

ＪＹ８２－２／３检漏继电器的改进鹤壁四矿李爱国，严守钦ＤＫＺＢ－４００／１１４０矿用隔爆型真空馈电开关，由徐州煤矿机械厂生产。适用于煤矿井下和其它周围介质中含有爆炸性气体（甲烷混合物）的环境中，在交流频率５０Ｈｚ、电压１１４０Ｖ或６６０Ｖ，额定电流至...     

手车式开关柜站(所)用变压器的防误装置优选

手车式开关柜站（所）用变压器的防误装置优选煤炭部重庆设计研究院龙世清手车式开关柜的站（所）用变压器手车，为防止在带负荷情况下被拉动，分或合隔离触头，必需有防误操作措施，现在的作法是：（１）３５ｋＶ站（所）用变压器低压侧加装－ＣＪ２０－１００／３型交流...     

馈电开关风电闭锁功能改进

通过改进分漏插件及操作回路，使ＢＫＤ１—４００Ｚ／６６０Ｆ型真空馈电开关的风电闭锁功能，符合《煤矿安全规程》关于停风巷道恢复送电之规定。     

WD—400型电动挖掘机电缆漏电保护器

我公司露天铁矿采场的ＷＤ－４００型电动挖掘机的６ｋＶ电源 经３００多ｍ长的高压电缆沿着地面直接接至架空线路高压隔离开关。由于采场环境比较差，这段长距离电缆受雨淋、日晒侵蚀，以及外力拖拉、放炮飞石砸伤等影响，每年多次发生因高压电缆绝缘破坏而产生的漏电故障，对现场工作人员人身安全产生危害。为了避免漏电故障给现场工作人员人身造成伤害，我们于１９９６年设计使用了漏电保护器，以上问题迎刃而解。该漏电保护器还具有电源缺相保护功能。 １ 原理 高压电缆正常运转时，通过调压器ＰＴ分压及三相桥式整流得到２２０Ｖ直流电…     

古城矿井35/6kV变电所墙体裂缝分析及处理

本文介绍了某矿井３５／６ｋＶ变电所因软弱地基引起的不均匀沉降导致墙体裂缝的原因，处理对策及体会。     

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。