电气工程专业英语课件lecture.ppt
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1、1,各位老师:上午好!,王传江E-mail:TEL:,Specialized English for Electrical Engineering,2,Introduction,什么是专业英语,隶属于科技英语 以表达科技概念、理论与事实为主要目的。遵守科技英语的语法体系和翻译方法;特别注重客观事实和真理,表达准确、精练、正式、逻辑性强。,是结合各自专业的科技英语 有很强的专业性,涉及的面更加狭窄,与专业内容配合更为密切。,专业英语与科技英语既有区别又有联系。专业英语的学习需要有一个良好的科技英语基础,同时也要注意其自身的词汇特点、语法特点、修辞特点和翻译特点等等。,3,Introduction
2、,学习专业英语的重要性科研信息获取 专业英语阅读能力技术情报资料专业技术文献工程设备文档资料研究成果展示 专业英语写作能力产品技术说明学术论文发表申请专利国际交流合作 专业英语表达、听说、应变能力,4,Teaching Tasks,扩充、掌握大量的专业词汇熟悉专业英语的词汇、句法提高专业英语的阅读理解能力、翻译能力和写作能力了解常用的专业英语口语表达方式,5,Contents,阅读翻译基础知识语法特点词汇特点常用符号公式表达学术论文写作英文文献查找应用口语,6,References,电力专业英语阅读与翻译 朱永强 主编.2007电气工程及其自动化专业英语苏小林 主编.2008电力英语应用口语
3、贾根娣 主编.2002电气工程及其自动化专业英语 魏立明 主编.2012,7,Lecture 1,Reading and Translation Basic Concepts of Electric Power System Part 1 Basic Construction of Electric Power System Electricity is an ideal energy form,which is convenient to deliver and use,and is clean without polluting our environment and atmosphere
4、.The generation,delivery and consumption of electricity are realized in an integrated system which is called electric power system or power system.An electric power system consists of three principal divisions:power generation,power transmission system,and power distribution systems.,8,Lecture 1,All
5、 the electricity the consumers take from the power system is generated in a power plant,or called power station,of some kind.Power generation is the first stage of the whole progress of the utilization of electric energy.Transmission systems are the connecting links between the generation plants and
6、 the distribution systems and lead to other power systems over interconnections.A distribution system connects all the individual loads to the transmission lines at the substations which perform voltage transformation and switching functions.Small generating plants located near the load are often co
7、nnected to the subtransmission or distribution system directly.,9,Lecture 1,Interconnection to neighboring power systems are usually formed at the transmission system level.The overall system thus consists of multiple generating sources and several layers of transmission networks.This provides a hig
8、h degree of structural redundancy that enables the system to withstand unusual contingencies without service disruption to the consumers.Part 2 Typical Topologies of Electric Power System The equipments which form an electric system are arranged depending on the manner in which load grows in the are
9、a and may be rearranged from time to time.,10,Lecture 1,However,there are certain plans into which a particular system design may be classified.Three types are illustrated:the radial system,the loop system and the network system.In a radial system,as shown in Fig.1.1,the lines form a“tree”spreading
10、out from the power source.Opening any line will result in interruption of power to one or more of the loads.,11,Lecture 1,The loop system is illustrated in Fig.1.2.With this arrangement all loads may be served even though one line section is removed from service.Fig.1.3 shows the same loads being se
11、rved by a network.With this arrangement each load has two or more circuits over which it is fed.,12,Lecture 1,Distribution circuits are commonly designed so that they may be classified as radial or loop circuit.The high-voltage transmission lines of most power systems are arranged as networks.The in
12、terconnection of major power systems result in networks made up many line sections.Part 3 Characteristics of Most Power System The first complete electric power system was a direct current(DC)system.The development of alternating current(AC)transmission led to AC electric power system.The AC system
13、had won out over the DC system for the following reasons:,13,Lecture 1,i)Voltage levels can be easily transformed in AC systems,thus providing the flexibility for use of different voltage for generation,transmission,and consumption.ii)AC electric machines are much simpler or cheaper than DC electric
14、 machines.Electric power systems vary in size and structural components.However,they all have the same basic characteristics:i)Are comprised of three-phase AC systems operating essentially at constant voltage.Generation and transmission facilities use three-phase equipment.Industrial loads are invar
15、iably three-phase;single-phase residential and commercial loads are distributed equally among the phases so as to effectively form a balanced three-phase system.,14,Lecture 1,ii)Use synchronous machines for generation of electricity.iii)Transmit power over significant distances to consumer spread ov
16、er a wide area.This requires a transmission system comprising subsystems operating at different voltage levels.,15,Lecture 1,客观性(Objective)、准确性(accuracy)和精练性(conciseness),Grammar Features广泛使用被动语态 广泛使用非谓语形式 省略句使用频繁It句型和祈使句使用频繁复杂长句使用频繁后置形容词短语作定语多,16,Lecture 1,电可以用数量和质量来度量。,2)Instrument transformers ar
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