电气工程专业英语课件lecture.ppt
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1、各位老师:各位老师:上午好!上午好!王传江王传江E-mail:TEL:Specialized English for Electrical Engineering1Introduction什么是专业英语什么是专业英语专业英语专业英语(English for Special Science and Technology)科技英语(科技英语(English for Science and Technology)普通英语普通英语(Common English,Ordinary English)l隶隶属属于于科科技技英英语语 以以表表达达科科技技概概念念、理理论论与与事事实实为为主主要要目目的的。遵遵
2、守守科科技技英英语语的的语语法法体体系系和和翻翻译译方方法法;特特别别注注重重客客观观事事实实和和真真理理,表表达达准准确确、精精练练、正正式式、逻辑性强逻辑性强。l是结合各自专业的科技英语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。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良好的科技英语基础技英语基础,同时也要,同时也要注意其自身的词汇特点、语法特点、修辞特点和翻译特注意其自身的词汇特点、语法特点、修辞特点和翻
3、译特点点等等。等等。2Introduction学习专业英语的重要性学习专业英语的重要性科研信息获取科研信息获取 专业英语阅读能力专业英语阅读能力技术情报资料技术情报资料专业技术文献专业技术文献工程设备文档资料工程设备文档资料研究成果展示研究成果展示 专业英语写作能力专业英语写作能力产品技术说明产品技术说明学术论文发表学术论文发表申请专利申请专利国际交流合作国际交流合作 专业英语表达、听说、应变能力专业英语表达、听说、应变能力3Teaching Tasks扩充、掌握大量的专业词汇扩充、掌握大量的专业词汇熟悉专业英语的词汇、句法熟悉专业英语的词汇、句法提高专业英语的阅读理解能力、翻译能力和写作提高
4、专业英语的阅读理解能力、翻译能力和写作能力能力了解常用的专业英语口语表达方式了解常用的专业英语口语表达方式4Contents阅读翻译阅读翻译基础知识基础知识语法特点语法特点词汇特点词汇特点常用符号公式表达常用符号公式表达学术论文写作学术论文写作英文文献查找英文文献查找应用口语应用口语5References电力专业英语阅读与翻译电力专业英语阅读与翻译 朱永强朱永强 主编主编.2007电气工程及其自动化专业英语电气工程及其自动化专业英语苏小林苏小林 主编主编.2008电力英语应用口语电力英语应用口语 贾根娣贾根娣 主编主编.2002电气工程及其自动化专业英语电气工程及其自动化专业英语 魏立明魏立明
5、 主编主编.20126Lecture 1Reading 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.The generation,delivery and
6、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.7Lecture 1 All the electricity the consumers
7、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 the distribution systems and l
8、ead 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 connected to the subtransmission
9、or distribution system directly.8Lecture 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 high degree of structural redundancy
10、 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 area and may be rearranged from time
11、 to time.9Lecture 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 out from the power source.Opening an
12、y line will result in interruption of power to one or more of the loads.10Lecture 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 served by a network.With this arrangemen
13、t each load has two or more circuits over which it is fed.11Lecture 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 interconnection of major power systems res
14、ult 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 had won out over the DC system for the f
15、ollowing reasons:12Lecture 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 machines.Electric power systems vary in s
16、ize 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 invariably three-phase;single-phase residential
17、 and commercial loads are distributed equally among the phases so as to effectively form a balanced three-phase system.13Lecture 1 ii)Use synchronous machines for generation of electricity.iii)Transmit power over significant distances to consumer spread over a wide area.This requires a transmission
18、system comprising subsystems operating at different voltage levels.14Lecture 1客观性(客观性(Objective)、准确性(准确性(accuracy)和精练性精练性(conciseness)Grammar Features广泛使用被动语态广泛使用被动语态 广泛使用非谓语形式广泛使用非谓语形式 省略句使用频繁省略句使用频繁It句型和祈使句使用频繁句型和祈使句使用频繁复杂长句使用频繁复杂长句使用频繁后置形容词短语作定语多后置形容词短语作定语多15Lecture 1电可以用数量和质量来度量。电可以用数量和质量来度量。2)I
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