Cable testing: can we do better?

This article will focus on some of these assumptions in the test procedures employed by the industry, examine why and how they were made, question their validity, see where they have led us, and finally, review how improvements in the process of applying new cable technology may be brought about. The industry has made many advances in the past 20 years. These involve not only tree-retardant, crosslinked polyethylene or strippable insulation shields, but also “very smart” shields with controlled strippability and reduced ion content. We now have water blocking constructions, both using strand filling compounds and metallic moisture barriers. Techniques are available for impregnating or drying aged installed cables to extend life and delay replacement. Perhaps most encouraging is the generally accepted but not universal use of cable jackets which provide mechanical protection and a partial moisture barrier role at minimal increased cost     

How far can we go?

This paper examines how far the impact of renewable energy can be realistically predicted over the next 10 years considering the current off-the-shelf renewable energy technology, rising electricity consumption and inflation in raw material feedstocks     

欧洲超超临界机组发展的特点和启示

京都协议CO2的减排压力,石油及天然气资源等的约束,使欧洲电力发展的目光转向高效清洁的燃煤发电技术。而基于材料技术的突破,高效超超临界技术的成熟,原有煤电机组的逐步退役及德国上大压小的成功经验等,目前欧洲已普遍采用600℃等级的大容量超超临界发电技术,并准备建设二氧化碳捕捉系统(CCS)。介绍了欧洲目前大力发展大容量燃煤超超临界机组的历史背景和现状。欧洲的超(超超)临界技术,采用塔式锅炉,无调节级和低凝汽压力汽轮机;100%容量高效汽动给水泵,单列高加,全容量高低压旁路,机组具备FCB功能,注重排烟热能综合利用,采用单列锅炉辅机等,均是极具参考价值的先进设计。外高桥三期工程,借鉴德国的依托新建项目不断推动技术进步的经验,在消化吸收先进技术的同时注重技术创新,取得了诸如锅炉蒸汽加热启动和稳燃技术等相当一批创新成果的成功,使机组的综合性能跃上了一个新的台阶。     

日本电力工业改革及其对我国电力市场建设的借鉴

概述了日本电力工业的发展历程和改革进程,并介绍了日本电力工业市场化改革的基本思路及总体设计方案.在此基础上,根据我国电力市场下一步改革的要求,从法律、环境、能源以及监管等几方面提出了对我国电力市场建设的启示.     

Yes, we can Twitter

Some people are addicted and others loathe it, and most of the messages are as frivolous as the name. That, though, is part of its charm and one of the main reasons why Twitter has taken the online world by storm. Kris Sangani gets set to tweet.     

How PBR can go wrong

This paper is a cautionary tale for performance-based regulation (PBR) to serve the public interest. There are different reasons for why PBR may fail to benefit utility customers. This paper provides a numerical example that shows that setting the wrong benchmark can have unintended consequences. The main message is that knowing whether a utility achieves a desirable outcome may be harder than what first meets the eye.     

SVC还可以热多久?——对话中国电力科学研究院教授级高级工程师林海雪

电力系统装备:SVC作为目前应用最普遍的动态无功补偿装置,它有哪些主要调节方式呢?……     

We can make it better! [President's Message]

It is my great pleasure to write to you as the IEEE Engineering in Medicine and Biology Society (EMBS) president while we are celebrating the 125th anniversary of the IEEE. The IEEE has had significant and lasting impact on engineering and related fields and has become one of the most influential professional societies in the world. Being a member society of the IEEE, the EMBS has played a significant and leadership role in the field of biomedical engineering. As the IEEE symbolizes technical excellence and societal impact, we should make every effort to maintain and enhance the quality and impact of what we are doing and what we plan to do.     

记忆法在英语教学中的应用研究

本文总结了英语教学中常用的几种记忆方法,并对大脑在不同时间段的记忆特点及如何创设语言环境等方面作了阐述,以便引导学生轻松学习英语.     

温州企业自报的产值究竟能挤出多少水分

对于温州的柳市镇政府来说,云集在该镇的低压电器制造商(占去中国近70%的市场),越来越让他们感到迷惑,因为该镇低压电器领域排名前三位的公司宣称,它们在去年的销售收入总和超过400亿元,这三家公司分别是正泰、德力西和人民电器。而柳市镇政府得到的官方统计数据却显示, 中国的低压电器市场总值不过250亿元。     

How fast can PCs truly go?

Despite predictions that computer-switching speeds are fast approaching fundamental limits, consumers continue to see a steady increase. Improved performance has pushed the clock speed of top end personal computers well over the 400 MHz mark. Perhaps more impressive, this improvement in operating speed has been achieved through incremental improvements on existing technology. Current personal computers have yet to exploit the potential of non-traditional computing technologies, such as optics and high speed GaAs. As these technologies are integrated into desktop computers, expect more significant increases in clock speed and overall performance. This trend of increasing processor speed naturally leads to questions concerning its actual fundamental limits. 1) What factors limit the speed of current integrated circuit (IC) based computers? 2) Is current IC technology approaching a fundamental limit? 3) What factors must be overcome to continue increasing computer speed? These questions are discussed     

Must-run generation: can we mix regulation and competition successfully?

In restructuring, certain generators will continue to be required to operate during critical times to assure local reliability. Regulation must allow these generators to participate in the competitive market, while assuming their availability to operate when needed and addressing concerns about their market power     

如何做好数字示波器幅值的测量审核

测量审核是能力验证活动的有效补充,是实验室认可活动中的重要环节。测量审核是对单位实验室指定项目具备高质量的标准/能力和对实验室人员的操作水平的证明。以数字示波器作为审核对象,通过对校准数字示波器测量结果的不确定度的分析;校准数字示波器中的最佳测量方法的选择,探讨如何将测量方法引起的使测量审核评判标准En增大的因素降到最低,从而帮助大家做好数字示波器的测量审核,以证明所在实验室校准此项标准所具备的最高能力,使实验室此项技术能力得到准确和客观的评价。     

乐清--中国电器之都距先进制造业基地还有多远

随着经济全球化发展,发达国家制造业开始向我国进行转移,尤其长江三角洲成为了承接发达国家制造业向外转移的重要地区,乐清电气行业,面临更加激烈的竞争和新的挑战。     

How we know what the eye and the mind's eye see

Milestones in the history of visual system research are reviewed. The use of computers is discussed. The significance of the studies described is examined     

浅议如何搞好电力行业职业技能鉴定考前培训

在职业技能鉴定前对考生进行专业理论与操作技能的综合培训,是目前电力企业开展技术工人岗位技能培训的重要手段.要提高技能鉴定考前培训的实效,为技能人才队伍建设发挥更大的作用,就需要相关培训机构提高对培训工作必要性和重要性的认识,转变陈旧和狭隘的观念,引入全新的培训方法.     

LED如何找到室内照明市场的平衡点

本文将从以下四个方面来宏观阐述LED照明光源相比其他光源的优势、在室内应用的意义、LED光源在室内照明领域应用的范围以及LED室内照明产品的研发和推广的方向。