高压电缆国内生产能力相对过剩

业内人士都清楚,电线电缆行业在我国是一个企业众多、竞争激烈的行业,有数据显示,我国目前拥有各类电线电缆生产企业7 000余家,行业生产规模的无序扩大导致设备利用率不足一半,企业利润下滑,众多企业保本或微利经营.……     

陈余义：征战电缆业

在陈余义看来,中国电缆市场的发展空间还远远没有饱和,但电线电缆产业的结构性调整确是势之必然.当前,铜、铝等原材料价格的持续暴涨已经越来越成为制约电线电缆行业发展的主要障碍,提升科技附加值被认为是电缆生产企业的重要方向.陈现在很看中这一点.     

塑造汉河品牌真诚服务社会

青岛汉缆股份有限公司是电线电缆技术研发和生产经营的国家重点高新技术企业。荣获全国守合同重信用企业、首届中国大企业集团竞争力500强企业、中国机电行业影响力100强企业等称号。拥有企业技术中心及贵阳、长沙、焦作、北海等子公司。     

青岛汉缆:电缆架桥连接世界

青岛汉缆股份有限公司——电线电缆高新技术研发和生产经营的国家重点高新技术企业、原电力部和机械部定点生产电线电缆的专业厂家、中国电线电缆行业大型骨干企业。汉缆产品远销巴基斯坦、埃及、美国、俄罗斯等30多个国家和地区,汉缆正在一步一步地实现规模化生产,正向一个国际化、标准化、高效性的世界级电线电缆行业的名牌企业的迈进!汉缆不仅成功自主研发高压电缆附件,还打破了国外企业对我国高压电缆附件的钳制,更一举使我国成为高压电缆附件的出口国,向国外输送附件,将"中国制造"、"青岛制造"、"汉缆制造"的高压电缆附件引领至世界,这是汉缆为全行业做出的巨大贡献。这份艰辛耕耘,将是电缆业历史画卷上的一抹重彩!     

2001年电线电缆行业整体走势良好 企业差距拉大

中国电器工业协会电线电缆分会在展开例行行业统计工作的同时,对部分电线电缆企业进行了一次抽样调查。调查对象为国内有一定实力和代表性的企业,共收集到样本89份,调查内容是2001年各厂(公司)的生产、经营运行状况。部分统计汇总资料如下表:     

电线电缆的检测

电线电缆由于电线电缆的重要性,国家对电线电缆的标准要求都比较严格。但由于电线电缆的生产厂家比较多,目前国内电线电缆的质量水平明显低于国外,且劣质的电线电缆充斥市场。就国内某家质检机构对某地区的市场上销售的电线电缆的调查来看,形势不容乐观。即使是通过ISO9000认证的电线电缆生产企业,其电线电缆的合格率也在90%以下,对于那些规模较小的没有通过认证的生产企业,其电线电缆的合格率不及30%。据该质检机构的调查报告,市场上电线电缆专营店所经销的电线电缆合格率在70%左右,市场上规模较小的五金交电经营店,其经销的电线电缆的合格率在10%以下,部分较落后地区的五金经营店经销的电线电缆甚至100%不合格,这些不合格电线电缆给生产带来严重的安全隐患。究其原因,主要是该部分店面所销售的电线电缆多为三无企业所产。国家虽然自去年对电线电缆的生产企业强制实行CCC认证,但还有很多没有通过CCC认证的企业在私下生产不合格电线电缆。另某些不具备CCC认证资格的企业通过采用借用实验设备和实验人员的方法获得CCC认证,像该种企业生产的电线电线大多不合格,且该种企业在国内普遍存在。所以用户在采购电线电缆的时候一定要采用正规的,有一定知名度的通过国家强制认证的电线电缆。     

宜兴电缆确立出口发展战略目标

随着“国家火炬计划宜兴电线电缆产业基地”和“江苏省电线电缆出口基地”两块电线电缆业界的金字招牌花落中国最大的宜兴电线电缆聚集生产基地,宜兴市电缆出口的发展战略目标也显得更为清晰：预计未来3—5年,宜兴电线电缆规模及品种将呈现跨越式增长,销售收入达1200亿元,占全国线缆产业经济总量的20茗,高新技术产品销售比重达到40%以上,出口企业超过30家,出口规模5亿美元以上,建立境外企业及窗口15个。     

二○○○年度电线电缆行业"百强"名单发布

继2000年8月份披露了全国电线电缆行业1999年度“五十强”名单(以1999年统计数据为准)之后,中国电器工业协会电线电缆分会今夏开展了电线电缆行业各企业2000年生产经营情况的调查统计工     

山东阳谷电缆集团有限公司

山东阳谷电缆集团有限公司（原山东阳谷电缆厂），始建于1986年，系从事电线电缆高新技术研究和生产经营的技术密集型国家大型企业。现拥有资产15亿元，职工4000人，其中专业技术人才986人，下辖12个分公司，可生产七大类800多种型号21000多种规格的电线电缆，年综合生产能力达20亿元。     

许继集团销售收入首次突破65亿元

2006年是"十一五"开局的第一年,在过去的2006年里许继集团呈现出三个"新"特征: 生产经营谱写新篇章.销售收入首次突破65亿元(含税),实现利润首次突破4亿元,且利润增长超过销售收入增长,各项经济技术指标均创历年新高."许继"商标被国家工商总局认定为"中国驰名商标";许继集团被国家发改委表彰为在振兴装备制造工业中做出突出贡献企业.     

An electric traction drive for electric vehicles

Problems of expanding the range of speed regulation in electric transport vehicles by replacing gear-shift transmission with a two-channel electric drive comprising two electric motors, each coupled with its own reducing gear units possessing different gear ratios. The output shafts of these reducing gear units are coupled to one differential speed-reduction device. To solve this problem, a mathematical model of the electric-motor drive has been developed and the static characteristics of the individual motors and characteristics of the motors with their output shafts driving one differential speed-reduction device have been determined. Steady conditions of the operation of a two-channel electric drive are considered. To describe real changes in the speed variables, the electromechanical transducer is approximated in the mathematical model with nonperiodic first-order links. The functions of the controlling effects, which are formed on the basis of the criterion of fullest utilization of electric machines with respect to their electromagnetic torque in stable conditions and in transient processes, were determined. Recommendations are given on application of the proposed solution to traction mechanisms, which should meet increased requirements to acceleration of electric-motor vehicles.     

A traction electric drive for electric cars

It is advisable to use a controlled electric drive in electric drives of electric off-road vehicles due to its significant multiplicity of the supported torque (5: 1 and higher) in a low-power mode. Such overloads can be achieved, for example, in electric drives with a field-regulated reluctance machine, not only because of the capacity of the electric machines, but also due to the choice of the drive control system. Analysis of requirements for the electric drive of an electric vehicle is performed, and the influence of the control method on the specific parameters is considered. Analysis of the number of independent control actions in synchronous reluctance electric drives is provided. The possibility of increasing the overload multiplicity of the torque by abandoning the vector control in favor of structures similar to dc drive systems is shown.     

国外电力

1德国10月28日运行其首个海岸风电场,该风电场距离德国北海沿岸大约500 m。装机5 000 kW的示范电场所发电力将导入威廉港天然气和电力电站,足以供5 000个家庭使用。据悉,胡克希尔风电场是将要建设的大型风电场的样板电厂。德国北海     

Think electric

With biofuels being subjected to allegations of hidden carbon costs and causing food shortages in the developing world, it has never been a better time for makers of that other current viable petrol alternative, electric cars, to develop and market them.     

Dual-mechanical-port electric machines-concept and application of a new electric

In this article, the various possible structures of a dual mechanical port (DMP) electric machine are explored and operation features discussed. Further, dynamic modeling of the DMP electric machine is presented. In particular, the salient features and suitability of DMP machine to hybrid electrical vehicles (HEVs) are discussed.     

电动汽车充电机对电能计量的影响

建立考虑线路阻抗和配电变压器的电动汽车充电机模型,仿真分析了充电机直流大功率充电和脉冲充电对电能计量的影响。仿真分析结果表明:恒流充电时充电机向电网注入谐波功率,注入功率的大小随充电功率和线路阻抗的增大呈上升趋势,但总体上占基波功率比值很小,为0.012%,对电能计量造成的影响有限;充电功率变化时谐波功率的特点与恒流充电时基本相同;脉冲充电方式下,谐波电流受脉冲充电频率影响较大,高频脉冲充电时含有大量偶次谐波与间谐波,采用积分算法原理进行电能计量的误差大于0.5%。     

Features of traction electric equipment of prospective electric rolling stock

On the main railways in Russia, two types of current in the contact wire are used: dc voltage of 3 kV and ac voltage of 25 kV with a frequency of 50 Hz. Therefore, prospective electric rolling stock should have double the power. Improving the capacity and structural speed of locomotives is based on the use of asynchronous traction motors (ATDs) with a squirrel-cage rotor allowing increasing the tractive force and the weight of the train and the capacity and speed of cargo delivery, increasing reliability and reducing life cycle costs, and increasing service life. Electrical equipment for such rolling stock should be used when working from either contact system, dc or ac. In this article, the scheme of power circuits is considered using the example of a module of a traction drive in one bogie of dual-system electric locomotives. It is proposed to use the secondary winding of the traction transformer as a choke of the input filter when powered from a dc contact system. Regulation of operation modes of asynchronous traction motors is carried out from static semiconductor converters with a two-tier structure. Input transducers provide the exchange of electric energy between the contact system and the intermediate link of dc voltage, and the output converters regulate the traction motors by changing the magnitude and frequency of voltage on the stator windings of ATD depending on the speed of the locomotive and its operating mode. 4QS input converters and output converters are autonomous voltage inverters of the intermediate ac: in the case of single-phase input and output, they are three-phase. The basic ratios are given to determine voltages and currents of 4QS converters, to determine the variable component of a rectified current 4QS converter, and to formulate requirements for a resonant L₂C₂ filter configured for a frequency of 100 Hz. Expressions are given for determining the ratio of the input power of the converter, as well as recommendations for determining the basic parameters of electrical equipment.     

Asynchronous electric motors for variable-frequency electric drives of drilling rigs

Operation peculiarities of the main drilling rig mechanisms are considered. The key specification requirements to asynchronous variable-frequency electric motors of the main drives are presented. The possibility of designing and developing the batch production of competitive, domestically produced drilling electric motors at enterprises of RUSELPROM concern is grounded.