电气工程专业英语资料
电气工程专业英语
1.It is conventional ..B positive2.Electric..D amperes3.The energy..C voltage4.The plus..A voltage polarity5.According..B absorbed1.The switching..C the off2.The typical..B 0.7V3.The power..D high r4.The rate..C power1.The DC-AC..B direct2.The Buck...C current3.The PWM... B pulse4.The gain..B the input control voltage 1.High power..C three2.The output..B sinusoidal3.The constant..B ac voltage4.V oltage..C inductive5.Output amplitude..B pulse-width1.A computer work..A a series of stored2.A keyboard..B an input3.The computer network..C a local4.A computer that..B client5.A hard.. C a storage1.Logical..B the ALU2.The 16..B sixteen bits3.A microprocessor..A more rapidly4.Data stored.. B permanently5.The basic..C CMOS1.is used..C a network card2.are pri..C AGP slots3.The network..B LCDs4.Image..B dot5.Printer..A an ink1.The first complete..B1882 a dc2.The first three..C 18933.Power system..A transmission4.In North..C60hz5. can ..A the HVDC1The protective..C tripping2.When the rip.. B switched off3.Any protection..A two4.The of.. D reliability5.The protective..B zeroThe concept of electric charge is电荷的概念是用来解释所有电气现象的基本概念。
电气工程及其自动化专业英语介绍
电气工程及其自动化专业英语介绍Introduction:Electrical Engineering and its Automation is a field of study that combines electrical engineering principles with automation techniques. This discipline focuses on the design, development, and implementation of electrical systems and their control using various automation technologies. In this article, we will delve into the various aspects of Electrical Engineering and its Automation, including its scope, key concepts, job opportunities, and future prospects.Body:1. Scope of Electrical Engineering and its Automation:1.1 Importance of Electrical Engineering:- Electrical engineering plays a vital role in various industries, including power generation, telecommunications, transportation, and manufacturing.- It involves the design and maintenance of electrical systems, such as power distribution networks, control systems, and electronic devices.1.2 Automation in Electrical Engineering:- Automation techniques are applied to enhance the efficiency, reliability, and safety of electrical systems.- Automation technologies, such as PLC (Programmable Logic Controller) and SCADA (Supervisory Control and Data Acquisition), are used for process control, monitoring, and data acquisition.1.3 Integration of Electrical Engineering and Automation:- The integration of electrical engineering principles with automation technologies enables the development of advanced control systems and intelligent machines.- It facilitates the automation of various industrial processes, leading to increased productivity and reduced human intervention.2. Key Concepts in Electrical Engineering and its Automation:2.1 Electrical Circuit Analysis:- This involves the study of electrical circuits and their behavior using mathematical models and techniques.- Concepts such as Ohm's law, Kirchhoff's laws, and circuit theorems are used to analyze and solve electrical circuit problems.2.2 Power Systems:- Power systems deal with the generation, transmission, and distribution of electrical energy.- Concepts like power generation, power factor correction, and power system protection are essential in ensuring a stable and reliable power supply.2.3 Control Systems:- Control systems involve the regulation and control of electrical processes.- Concepts like feedback control, PID (Proportional-Integral-Derivative) controllers, and system stability are crucial in designing and implementing control systems.3. Job Opportunities in Electrical Engineering and its Automation:3.1 Electrical Engineer:- Electrical engineers are responsible for designing, developing, and maintaining electrical systems.- They work in various industries, including power generation, telecommunications, and manufacturing.3.2 Automation Engineer:- Automation engineers specialize in the design and implementation of automation systems.- They develop control strategies, program PLCs, and integrate automation technologies into electrical systems.3.3 Research and Development:- Electrical engineering and its automation offer numerous research and development opportunities.- Researchers work on developing innovative technologies and improving existing systems to meet the evolving demands of industries.4. Future Prospects in Electrical Engineering and its Automation:4.1 Renewable Energy:- The growing focus on renewable energy sources, such as solar and wind power, presents new challenges and opportunities in electrical engineering and its automation.- Engineers are needed to design and optimize renewable energy systems and integrate them into the existing power grid.4.2 Internet of Things (IoT):- The integration of electrical systems with IoT technologies opens up new avenues for automation and control.- Electrical engineers can leverage IoT to develop smart grids, intelligent buildings, and efficient energy management systems.4.3 Artificial Intelligence (AI):- AI techniques, such as machine learning and neural networks, can be applied to enhance the automation capabilities of electrical systems.- Electrical engineers can explore the use of AI for predictive maintenance, fault detection, and optimization of electrical processes.Conclusion:Electrical Engineering and its Automation is a dynamic field that combines electrical engineering principles with automation technologies. It plays a crucial role in various industries and offers a wide range of job opportunities. The integration of electrical engineering with automation enables the development of advanced control systems and intelligent machines. With the increasing focus on renewable energy, IoT, and AI, the future prospects in this field are promising. As technology continues to advance, electrical engineering and its automation will continue to evolve, driving innovation and shaping the future of industries.。
电气工程及其自动化专业英语介绍
Electrical Engineering and Automation Electrical Engineering and Automation was created at forty years ago. AS a new subject, it is relating to many walks of life, small to a switch designed to study aerospace aircraft, has its shadow.Electrical Engineering and Automation of electrical information professional is an emerging field of science, but because of people's daily lives and industrial production is closely related to the extraordinarily rapid development of relatively more mature now. High-tech industry has become an important component of the widely used in industry, agriculture, national defense and other fields, in the national economy is playing an increasingly important role.Worse more, Electrical Engineering and Automation is very hard to learn. The graduate should obtain much knowledge and ability. Such as natural science foundations include more sturdy mathematics, physics, etc, better Humanity, social science basic for sum foreign language for integration capability. Besides the essential technological basic theory knowledge of the originally professional field, mainly include circuit, electric magnetic field theory, electronic technology, information place in system Paying attention to, control theory, computer software andhardware basic theories. And so on.Control theory and electrical network theory is a professional electrical engineering and automation of the base, power electronics technology, computer technology is its main technical means, but also includes a system analysis, system design, system development and system management and decision-making research. There are some characteristics of the profession, that is, combining the strength of power, electrical and electronic technology, software and hardware combined with a cross-disciplinary nature, electricity, electronics, control, computer integrated multi-disciplinary, so that graduates with strong adaptation capacity.Electricity is the most important and convenient energy which the modern society depends on more heavily than ever before. Electric power system, providing electricity to the modern society, has become indispensible components of the industry world. Power system and automation researches on how to produce, transform, transmit, distribute, use, control and manage electricity. It combines the traditional electrotechology with computer science ,power electronics and automation control theory ,with board prospects for development.We quest the principle and structure of power system network in order to improve our system to provide a reliable power supply with acceptable voltages and frequency to the customers. This major contains 3 core curricula--Motor learning, Power system analysis and Relay protection.Motor learning introduces the basic equipments of power system to us such as generators, transformers and motors. It's the basis of the following two curricula.Power system analysis describes the power flow calculation , power system control(one isactive power and frequency control the other is reactive power and voltage control)and power system stability(including small disturbance stability and transient sta...电气10-3班魏学军25号。
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Section I basic electric circuit Chapter 1 Introduction to electric circuitsNew Words and Expressions1. electrical circuit n. 电路2. voltage n. 电压，伏特3. current n. 电流，通用的, 流通的, 现在的4. current flow n. 电流5. resistor n. 电阻，电阻器6. battery n. 电池7. load n. 负载，负荷8. performance n. 性能9. circuit diagram n. 电路图10. idealized model n. 理想模型Introduction*A simple circuit and its components.*Idealized model of the circuit*Model can be changed if necessary.*summarizeIn elementary physics classes you undoubtedly have been introduced to the fundamental concepts of electricity and how real components can be put together to form an electrical circuit. A very simple circuit, for example, might consist of a battery, some wire, a switch, and an incandescent light bulb as shown in Fig.1-1. The battery supplies the energy required to force electrons around the loop, heating the filament of the bulb and causing the bulb to radiate a lot of heat and some light. Energy is transferred from a source, the battery, to a load, the bulb. ————You probably already know that the voltage of the battery and the electrical resistance of the bulb have something to do with the amount of current that will flowin the circuit. From your own practical experience you also know that no current will flow until the switch is closed. That is, for a circuit to do anything, the loop has to be completed so that electrons can flow from the battery to the bulb and then back again to the battery. And finally, you probably realize that it doesn’t much matter whether there is one foot or two feet of wire connecting the battery to the bulb, but that it probably would matter if there is a mile of wire between it and the bulb.Also shown in Fig. 1-1 is a model made up of idealized components. The battery is modeled as an ideal source that puts out a constant voltage, VB, no matter what amount of current, i, is drawn. The wires are considered to be perfect conductors that offer no resistance to current flow. The switch is assumed to be open or closed. There is no arcing of current across the gap when the switch is opened, nor is there any bounce to the switch as it makes contact on closure. The light bulb is modeled as a simple resistor, R, that never changes its value, no matter how hot it becomes or how much current is flowing throughit.Fig. 1-1 (a) A simple circuit(b) An idealized representationof the circuitFor most purposes, the idealized model shown in Fig. 1-1b is an adequate representation of the circuit; that is, our prediction of the current that will flow through the bulb whenever the switch is closed will be sufficiently accurate that we can consider the problem solved. There may be times, however, when the model is inadequate. The battery voltage, for example, may drop as more and more current is drawn, or as the battery ages. ————The light bulb’s resistance may change as it heats up, and the filament may have a bit of inductance and capacitance associated with it as well as resistance so that when the switch is closed, the current may not jump instantaneously from zero to some final, steady state value. The wires may beundersized, and some of the power delivered by the battery may be lost in the wires before it reaches the load. These subtle effects may or may not be important, depending on what we are trying to find out and how accurately we must be able to predict the performance of the circuit. If we decide they are important, we can always change the model as necessary and then proceed with the analysis. The point here is simple. The combinations of resistors, capacitors, inductors, voltage sources, current sources, and so forth, that you see in a circuit diagram are merely models of real components that comprise a real circuit, and a certain amount of judgment is required to decide how complicated the model must be before sufficiently accurate results can be obtained. For our purposes, we will be using very simple models in general, leaving many of the complications to more advanced textbooks.Chapter 2 Definitions of key electrical quantitiesNew Words and Expressionscharge n. vt. 电荷；充电nucleus n. 原子核（pl.）；nuclear adj.negative n. 否定, 负数, 底片adj.否定的, 消极的, 负的, 阴性的positive adj. [数]正的adj.[电]阳的in general 通常,大体上, 一般而言，总的说来algebraic adj. 代数的, 关于代数学的solution to the circuit problem n. 关于电路问题的解法the units of power n. 功率的单位direct current (dc) n 直流电alternating current(ac) n. 交流电sinusoidally adv. 正弦地transistor n. 晶体管Part 1 Charge and CurrentAn atom consists of a positively charged nucleus surrounded by a swarm of negatively charged electrons. The charge associated with one electron has been found to be 1.602×10−19coulombs; or, stated the other way around, one coulomb can be defined as the charge on 6.242×1018 electrons. While most of the electrons associated with an atom are tightly bound to the nucleus, good conductors, like copper, have free electrons that are sufficiently distant from their nuclei that their attraction to any particular nucleus is easily overcome. These conduction electrons are free to wander from atom to atom, and their movement constitutes an electric current.In a wire, when one coulomb’s worth of charge passes a given spot in one second, the current is defined to be one ampere (abbreviated A), named after the nineteenth-century physicist Andr’e Marie Amp`ere. That is, current i is the net rate of flow of charge q past a point, or through an area:i=d q/d t (1.1) In general, charges can be negative or positive. For example, in a neon light, positive ions move in one direction and negative electrons move in the other. Each contributes to current, and the total current is their sum. By convention, the direction of current flow is taken to be the direction that positive charges would move, whether or not positive charges happen to be in the picture. Thus, in a wire, electrons moving to the right constitute a current that flows to the left, as shown in Fig.1-2.Fig. 1-2 By convention, negative charges moving in one direction constitute a positive current flow in the opposite directionWhen charge flows at a steady rate in one direction only, the current is said to be direct current, or dc. A battery, for example, supplies direct current. When charge flows back and forth sinusoidally, it is said to be alternating current, or ac. In the United States the ac electricity delivered by tes of ac and dc are shown in Fig.1-3.(a) (b)Fig. 1-3 (a) Steady-state direct current (dc) (b) Alternating current (ac)Part 2 Kirchhoff’s Current LawTwo of the most fundamental properties of circuits were established experimentally a century and a half ago by a German professor, Gustav Robert Kirchhoff (1824–1887). The first property, known as Kirchhoff’s current law (abbreviated KCL), states that at every instant of time the sum of the currents flowing into any node of a circuit must equal the sum of the currents leaving the node, where a node is any spot where two or more wires are joined. This is a very simple, but powerful concept. It is intuitively obvious once you assert that current is the flow of charge, and that charge is conservative—neither being created nor destroyed as it enters a node. Unless charge somehow builds up at a node, which it does not, then the rate at which charge enters a node must equal the rate at which charge leaves the node.There are several alternative ways to state Kirchhoff’s current law. The most commonly used statement says that the sum of the currents flowing into a node is zero as shown in Fig. 1-4a, in which case some of those currents must have negative values while some have positive values. Equally valid would be the statement that the sum of the currents leaving a node must be zero as shown in Fig. 1-4b(again some of these currents need to have positive values and some negative). Finally, we could say that the sum of the currents entering a node equals the sum of the currents leaving a node (Fig. 1-4c). These are all equivalent as long as we understand what is meant about the direction of current flow when we indicate it with an arrow on a circuit diagram. Current that actually flows in the direction shown by the arrow is given a positive sign. Currents that actually flow in the opposite direction have negative values.Fig. 1-4 Illustrating various ways that Kirchhoff’s current law can be stated(a) The sum of the currents into a node equals zero(b) The sum of the currents leaving the node is zero(c) The sum of the currents entering a node equals the sum of the currents leaving the nodeNote that you can draw current arrows in any direction that you want—that much is arbitrary—but once having drawn the arrows, you must then write Kirchhoff’s current law in a manner that is consistent with your arrows, as has been done in Fig.1-4. The algebraic solution to the circuit problem will automatically determine whether or not your arbitrarily determined directions for currents were correct.Example 1.1 Using Kirchhoff’s Current LawA node of a circuit is shown with current direction arrows chosen arbitrarily. Having picked those directions, i1 = −5 A, i2 = 3 A, and i3 = −1 A. Write an expression for Kirchhoff’s current law and solve for i4.Solution. By Kirchhoff’s current law,i1 + i2 = i3 + i4−5 + 3 = −1 + i4so that i4 = −1 AThat is, i4 is actually 1 A flowing into the node. Note that i2, i3, and i4 are all entering the node, and i1 is the only current that is leaving the node.Part 3 Kirchhoff’s Voltage LawElectrons won’t flow through a circuit unless they are given some energy to help send them on their way. That “push”is measured in volts, where voltage is defined to be the amount of energy (w, joules) given to a unit of charge,v=dw/dq (1-2)A 12-V battery therefore gives 12 joules of energy to each coulomb of charge that it stores. Note that the charge does not actually have to move for voltage to have meaning. Voltage describes the potential for charge to do work.While currents are measured through a circuit component, voltages are measured across components. Thus, for example, it is correct to say that current through a battery is 10 A, while the voltage across that battery is 12 V. Other ways to describe the voltage across a component include whether the voltage rises across the component or drops. Thus, for example, for the simple circuit in Fig. 1-1, there is a voltage rise across the battery and voltage drop across the light bulb.V oltages are always measured with respect to something. That is, the voltage of the positive terminal of the battery is “so many volts”with respect to the negative terminal; or, the voltage at a point in a circuit is some amount with respect to some other point. In Fig. 1-5, current through a resistor results in a voltage drop from point A to point B of V AB volts. V A and VB arethe voltages at each end of theresistor, measured with respectto some other point.Fig. 1-5 The voltage drop from point A to point B is V AB, where V AB = V A −VBThe reference point for voltages in a circuit is usually designated with a ground symbol. While many circuits are actually grounded—that is, there is a path for current to flow directly into the earth—some are not (such as the battery, wires, switch, and bulb in a flashlight). When a ground symbol is shown on a circuit diagram, you should consider it to be merely a reference point at which the voltage is defined to be zero. Fig.1-6 points out how changing the node labeled as ground changes the voltages at each node in the circuit, but does not change the voltage drop across each component.The second of Kirchhoff’s fundamental laws states that the sum of the voltages around any loop of a circuit at any instant is zero. This is known as Kirchhoff’s voltage law (KVL). Just as was the case for Kirchhoff’s current law, there are alternative, but equivalent, ways of stating KVL. We can, for example, say that the sum of the voltage rises in any loop equals the sum of the voltage drops around the loop. Thus in Fig. 1-6, there is a voltage rise of 12 V across the battery and a voltage drop of 3 V across R1 and a drop of 9 V across R2. ————Notice that it doesn’t matter which node was labeled ground for this to be true. Just as was the case with Kirchhoff’s current law, we must be careful about labeling and interpreting the signs of voltages in a circuit diagram in order to write the proper version of KVL. A plus (+) sign on a circuit component indicates a reference direction under the assumption that the potential at that end of the component is higher than the voltage at the other end. Again, as long as we are consistent in writing Kirchhoff’s voltage law, the algebraic solution for the circuit will automatically take care of signs.Part 5 Summary of Principal Electrical QuantitiesThe key electrical quantities already introduced and the relevant relationships between these quantities are summarized in Table 1-1.Since electrical quantities vary over such a large range of magnitudes, you will often find yourself working with very small quantities or very large quantities. For example, the voltage created by your TV antenna may be measured in millionths of a volt (microvolts, μV), while the power generated by a large power station may be measured in billions of watts, or gigawatts (GW). To describe quantities that may take on such extreme values, it is useful to have a system of prefixes that accompany the units. The most commonly used prefixes in electrical engineering are given in Table 1-2.Table1-1 Key Electrical Quantities and RelationshipsTable 1-2 Common PrefixesPart 6 Ideal Voltage Source and Ideal Current SourceElectric circuits are made up of a relatively small number of different kinds of circuit elements, or components, which can be interconnected in an extraordinarily large number of ways. At this point in our discussion, we will concentrate on idealized characteristics of these circuitelements, realizing that real components resemble, but do not exactly duplicate, the characteristics that we describe here.An ideal voltage source is one that provides a given, known voltage vs, no matter what sort of load it is connected to. That is, regardless of the current drawn from the ideal voltage source, it will always provide the same voltage. Note that an ideal voltage source does not have to deliver a constant voltage; for example, it may produce a sinusoidally varying voltage—the key is that voltage is not a function of the amount of current drawn. A symbol for an ideal voltage source is shown in Fig. 1-7.A special case of an ideal voltage source is an ideal battery that provides a constant dc output, as shown in Fig. 1-8. A real battery approximates the ideal source; but as current increases, the output drops somewhat. To account for that drop, quite often the model used for a real battery is an ideal voltage source in series with the internal resistance of the battery.An ideal current source produces a given amount of current is no matter what load it sees. As shown in Fig. 1-9, a commonly used symbol for such a device is circle with an arrow indicating the direction of current flow. While a battery is a good approximation to an ideal voltage source, there is nothing quite so familiar that approximates an ideal current source. Some transistor circuits come close to this ideal and are often modeled with idealized current sources.Section II The electric power systemChapter 1 Brief Introduction to The Electric Power SystemPart 1 Minimum Power systemNew Words and ExpressionsMinimum a 最小prime mover n 原动机generator n 发电机load n 负载furnace n 炉膛boiler n 锅炉fissionable n 可裂变的fissionable material 核燃料reactor n 反应堆nuclear reactor核反应堆elevation n 高度，海拔internal combustion engine 内燃机steam-driven turbine 汽轮机hydraulic turbine 水轮机convert v 变换，转换shaft n 传动轴，轴torque n 力矩servomechanism n 伺服机构*Elements of a minimum electric power system*Types of energy source*Types of prime mover*Types of electrical load*Functions of the control systemA minimum electric power system is shown in Fig.1-1, the system consists of an energy source, a prime mover, a generator, and a load.The energy source may be coal, gas, or oil burned in a furnace to heat water and generate steam in a boiler; it may be fissionable material which, in a nuclear reactor, will heat water to produce steam; it may be water in a pond at an elevation above the generating station; or it may be oil or gas burned in an internal combustion engine.The prime mover may be a steam-driven turbine, a hydraulic turbine or water wheel, or an internal combustion engine. Each one of these prime movers has the ability to convert energy in the form of heat, falling water, or fuel into rotation of a shaft, which in turn will drive thegenerator.The electrical load on the generator may be lights, motors, heaters, or other devices, alone or in combination. Probably the load will vary from minute to minute as different demands occur.The control system functions （are）to keep the speed of the machines substantially constant and the voltage within prescribed limits, even though the load may change. To meet these load conditions, it is necessary for fuel input to change, for the prime mover input to vary, and for the torque on the shaft from the prime mover to change in order that the generator may be kept at constant speed. In addition, the field current to the generator must be adjusted to maintain constant output voltage. The control system may include a man stationed in the power plant who watches a set of meters on the generator output terminals and makes the necessary adjustments manually. In a modern station, the control system is a servomechanism that senses generator-output conditions and automatically makes the necessary changes in energy input and field current to hold the electrical output within certain specifications.Part 2 More Complicated Systems*Foreword*Cases of power system with out circuit breaker*Power system with circuit breakerNew Words and Expressions1. associated a 联接的2. circuit n 电路3. circuit breaker n 断路器4. deenergize vt 切断，断电5. deenergized adj 不带电的6. outage n 停电7. diagram n 简图8. switch out of 退出来，断开9. switch off v 切断，关闭In most situations the load is not directly connected to the generator terminals. More commonlythe load is some distance from the generator, requiring a power line connecting them. It is desirable to keep the electric power supply at the load within specifications. However, the controls are near the generator, which may be in another building, perhaps several miles away.If the distance from the generator to the load is considerable, it may be desirable to install transformers at the generator and at the load end, and to transmit the power over a high-voltage line (Fig.1-2). For the same power, the higher-voltage line carries less current, has lower losses for the same wire size, and provides more stable voltage.In some cases an overhead line may be unacceptable. Instead it may be advantageous to use an underground cable. With the power systems talked above, the power supply to the load must be interrupted if, for any reason, any component of the system must be moved from service for maintenance or repair.Additional system load may require more power than the generator can supply. Another generator with its associated transformers and high-voltage line might be added.It can be shown that there are some advantages in making ties between the generators (1) and at the end of the high-voltage lines (2 and 3), as shown in Fig.1-3. This system will operate satisfactorily as long as no trouble develops or no equipment needs to be taken out of service.The above system may be vastly improved by the introduction of circuit breakers, which may be opened and closed as needed. Circuit breakers added to the system, Fig.1-4, permit selected piece of equipment to switch out of service without disturbing the remainder of system. With this arrangement any element of the system may be deenergized for maintenance or repair by operation of circuit breakers. Of course, if any piece of equipment is taken out of service, then the total load must be carried by the remaining equipment. Attention must be given to avoid overloads during such circumstances. If possible, outages of equipment are scheduled at times when load requirements are below normal.Fig.1-5 shows a system in which three generators and three loads are tied together by threetransmission lines. No circuit breakers are shown in this diagram, although many would be required in such a system.Chapter 2 Faults on Power SystemNew Words and Expressions1. fault n 故障2. interference n 干扰，防碍3. exceed vt 超出，超过4. abnormal n 异常的，不规则的5. intentional n 故意的6. feed (fed) 给。
(最新整理)(完整版)电气工程及其自动化专业英语
电气工程及其自动化专业教研室
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• The exciting or magnetizing current （励磁电流）can thus be very small. Further, the proportion of the total flux which is linked mutually by the two coils is greatly increased.
of two coils in close proximity. One coil of N1 turns is excited with
alternating current and therefore establishes a flux φ11 which alternates with the current (随时间交变）. The other coil is linked
• the applied voltage 外施电压
• zero-power-factor 零功率因数
• the no-load power factor 空载功率因数
• formulate 用公式表示,系统地阐述
• saturation 饱和
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Unit 11 The Transformer on No Load
a result (因此), is called the secondary winding.
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• It should not be difficult to realize that the two functions are interchangeable: if coil 2 were excited instead, a mutual e.m.f. would be induced in coil 1 which would then become the secondary winding(二次绕组).
电气工程专业英语section 1-1
Section1 Current and Voltage
flow as the movement of positive charges, that is, opposite to the flow of negative charges, as Fig.l-1 illustrates. This convention was introduced by Benjamin Franklin (l706～l790), the American scientist and inventor. Although we now know that current in metallic conductors is due to negatively charged electrons, we will follow the universally accepted convention that current is the net flow of positive charges. Thus, Electric current is the time rate of charge, measured in amperes (A). Mathematically, the relationship among current i, charge q, and time t is
p ui
(1-6)
Because u and i are generally function of time, the power p in Eq. (1-6) is a time-varying quantity and is called the instantaneous power. The power absorbed or supplied by an element is the product of the voltage across the element and the current through it. If the power has a plus sign, power is being delivered to or absorbed by the element. If,
PEC电气工程专业英语证书考试-电力系统专业英语词汇doc资料
PEC电气工程专业英语证书考试-电力系统专业英语词汇active filter 有源滤波器Active power 有功功率ammeter-电流表taped-transformer-多级变压器amplitude modulation (AM) 调幅analytical 解析的Arc reignition 电弧重燃Arc suppression coil 消弧线圈arc-extinguishing-chamber-灭弧室dynamo-直流发电机Armature 电枢Armature--电枢Internal--combustion--engine--内燃机Automatic oscillograph 自动录波仪Automatic-control-自动控制Principles-of-electric-circuits-电路原理Automatic--meter--reading--自动抄表Boiler--锅炉Autotransformer 自藕变压器Autotransformer 自耦变压器baghouse 集尘室Bare conductor 裸导线binary 二进制Blackout 断电、停电Brush--电刷Deenergize--断电Bus tie breaker 母联断路器Bushing 套管bushing-tap-grounding-wire-套管末屏接地线power-transformer-电力变压器calibrate 校准Capacitor bank 电容器组Carbon brush 炭刷cascade-transformer-串级变压器disconnector-隔离开关Combustion turbine 燃气轮机Commutator--换向器Underground--cable--地下电缆Composite insulator 合成绝缘子conductor-导线current-transformer-CT-电流互感器Converter (inverter) 换流器（逆变器）Copper loss 铜损Counter--emf--反电势coupling-capacitor-耦合电容earthing-switch-接地开关Creep distance 爬电距离crusher 碎煤机decimal 十进制Demagnetization 退磁，去磁detection-impedance-检测阻抗asynchronous-machine-异步电机Digital-signal-processing-数字信号处理Dispatcher 调度员Distribution dispatch center 配电调度中心Distribution system 配电系统Distribution--automation--system--配电网自动化系统Servomechanism--伺服系统Domestic load 民用电Drum 汽包，炉筒Eddy current 涡流electrostatic-voltmeter-静电电压表variable-transformer-调压变压器EMC (electromagnetic compatibility) 电磁兼容exciting-winding-激磁绕组grading-ring-均压环Extra-high voltage (EHV) 超高压Feeder 馈电线FFT (fast Fourier transform) 快速傅立叶变换fixed-contact-静触头steam-turbine-汽轮机flash-counter-雷电计数器charging(damping)-resistor-充电(阻尼)电阻Flexible AC transmission system(FACTS) 灵活交流输电系统Fossil-fired power plant 火电厂frequency modulation (FM) 调频frequency-domain 频域fuse 保险丝，熔丝gas-insulated-substation-GIS-气体绝缘变电站turbogenerator-汽轮发电机generator-发电机GIS (gas insulated substation, geographic information system) 气体绝缘变电站,地理信息系统glass-insulator-玻璃绝缘子inverter-station-换流站glow-discharge-辉光放电harmonic-谐波grounding-capacitance-对地电容step-up-(down)-transformer-升(降)压变压器hexadecimal 十六进制high-voltage-testing-technology-高电压试验技术Power-electronics-电力电子humidity 湿度hydro-power-station-水力发电站lightning-arrester-避雷器IC (integrated circuit) 集成电路IEC (international Electrotechnical Commission) 国际电工（技术）委员会IEE (Institution of Electrical Engineers) 电气工程师学会（英）IEEE (Institute of Electrical and Electronic Engineers) 电气与电子工程师学会（美）impulse-current-冲击电流power-network-电力网络impulse-flashover-冲击闪络insulation-绝缘Independent pole operation 分相操作Induction 感应Inductive (Capacitive) 电感的(电容的)inhomogenous-field-不均匀场overvoltage-过电压Instrument transducer 测量互感器insulation-coordination-绝缘配合aging-老化internal-discharge-内部放电alternating-current-交流电Iron loss 铁损ISO (international standardization organization) 国际标准化组织Kinetic(potential) energy 动（势）能LAN (local area network) 局域网Lateral 支线Leakage flux 漏磁通LED (light emitting diode) 发光二极管Light(boiling)-water reactor 轻（沸）水反应堆lightning-overvoltage-雷电过电压arc-discharge-电弧放电lightning-stroke-雷电波AC-transmission-system-交流输电系统Line trap 线路限波器Load shedding 甩负荷Loop system 环网系统loss-angle（介质）损耗角attachment-coefficient-附着系数magnetic-field-磁场attenuation-factor-衰减系数Main and transfer busbar 单母线带旁路Malfunction 失灵mean-free-path-平均自由行程anode-(cathode)-阳极（阴极）mean-molecular-velocity-平均分子速度breakdown-（电）击穿mixed-divider-(阻容)混合分压器transmission-line-传输线moisture 潮湿，湿气moving-contact-动触头hydraulic-turbine-水轮机Nameplate 铭牌negative-ions-负离子bubble-breakdown-气泡击穿neutral-point-中性点hydrogenerator-水轮发电机non-destructive-testing-非破坏性试验cathode-ray-oscilloscope-阴极射线示波器non-uniform-field-不均匀场cavity-空穴,腔nuclear-power-station-核电站bus-bar-母线numerical 数字的octal 八进制oil-filled-power-cable-充油电力电缆overhead-line-架空线Oil-impregnated paper 油浸纸绝缘operation amplifier 运算放大器operation amplifier 运算放大器Operation mechanism 操动机构oscilloscope-示波器sulphur-hexafluoride-breaker-SF6-断路器Outgoing (incoming) line 出（进）线partial-discharge-局部放电corona-电晕passive filter 无源滤波器Peak-load 峰荷peak-reverse-voltage-反向峰值电压composite-insulation-组合绝缘peak-voltmeter-峰值电压表potential-transformer-PT-电压互感器Phase displacement (shift) 相移Phase Lead(lag) 相位超前（滞后）Phase shifter 移相器phase-to-phase-voltage-线电压Dielectric-电介质,绝缘体photoelectric-emission-光电发射critical-breakdown-voltage-临界击穿电压photon-光子Discharge-放电Pneumatic(hydraulic) 气动（液压）point-plane-gap-针板间隙earth(ground)-wire-接地线polarity-effect-极性效应dielectric-constant-介质常数porcelain-insulator-陶瓷绝缘子front(tail)-resistance-波头(尾)电阻Potential stress 电位应力(电场强度)Power factor 功率因数Power line carrier (PLC) 电力线载波（器）power-capacitor-电力电容dielectric-loss-介质损耗Power--factor--功率因数Torque--力矩Power-flow current 工频续流power-system-电力系统Primary(backup) relaying 主(后备)继电保护Prime grid substation 主网变电站Protective relaying 继电保护pulverizer 磨煤机Pulverizer 磨煤机Pumped storage power station 抽水蓄能电站quasi-uniform-field-稍不均匀场direct-current-直流电radio-interference-无线干扰divider-ratio-分压器分压比rated 额定的rating-of-equipment-设备额定值grounding-接地Reactance (impedance) 电抗（阻抗）Reactive 电抗的，无功的Reactive power` 无功功率Reactor 电抗器Reclosing 重合闸Recovery voltage 恢复电压Rectifier 整流器Relay panel 继电器屏relay-继电器iron-core-铁芯Reserve capacity 备用容量residual-capacitance-残余电容electrochemical-deterioration-电化学腐蚀resonance 谐振，共振Restriking 电弧重燃Retaining ring 护环RF (radio frequency) 射频Right-of-way 线路走廊Rms (root mean square) 均方根值Rogowski-coil-罗可夫斯基线圈vacuum-circuit-breaker-真空断路器routing-testing-常规试验electric-field-电场Rpm (revolution per minute) 转/分Salient-pole 凸极scale 刻度，量程Schering-bridge-西林电桥live-tank-oil-circuit-breaker-少油断路器Series (shunt) compensation 串（并）联补偿Shaft 转轴Shield wire 避雷线-shielding-屏蔽electron-avalanche-电子崩Short-circuit ratio 短路比short-circuit-testing-短路试验electronegative-gas-电负性气体Shunt reactor 并联电抗器Silicon carbide 碳化硅Silicon rubber 硅橡胶Single (dual, ring) bus 单（双，环形）母线Skin effect 集肤效应Slip ring 滑环space-charge-空间电荷epoxy-resin-环氧树脂sparkover 放电sphere-gap-球隙rotor-转子Spot power price 实时电价Static var compensation (SVC) 静止无功补偿Stationary (moving) blade 固定（可动）叶片Stator(rotor) 定（转）子steel-reinforced-aluminum-conductor--钢芯铝绞线tank-箱体stray-capacitance-杂散电容motor-电动机stray-inductance-杂散电感stator-定子streamer-breakdown-流注击穿expulsion-gap-灭弧间隙substation-变电站Insulator-绝缘子Superheater 过热器Supervisory control and data acquisition (SCADA) 监控与数据采集surface-breakdown-表面击穿field-strength-场强Surge 冲击，过电压surge-impedance-波阻抗dead-tank-oil-circuit-breaker-多油断路器suspension-insulator-悬式绝缘子bushing-套管sustained--discharge--自持放电field--stress--电场力Switchboard 配电盘，开关屏switching--overvoltage--操作过电压field--distortion--场畸变Synchronous condenser 同步调相机Synchronous condenser 同步调相机Tap 分接头Telemeter 遥测terminal 接线端子Tertiary winding 第三绕组test-object-被试品synchronous-generator-同步发电机thermal--breakdown--热击穿field--gradient--场梯度thermal-power-station-火力发电站metal-oxide-arrester-MOA-氧化锌避雷器Tidal current 潮流time-domain 时域Time-of-use(tariff) 分时（电价）Transfer switching 倒闸操作treeing--树枝放电field--emission--场致发射trigger-electrode-触发电极highvoltage-engineering-高电压工程Trip circuit 跳闸电路Trip coil 跳闸线圈tuned-circuit-调谐电路winding-绕组Turn (turn ratio) 匝（匝比，变比）Ultra-high voltage (UHV) 特高压uniform--field--均匀场flashover--闪络Uninterruptible power supply 不间断电源voltage-divider-分压器circuit-breaker-CB-断路器wave--front(tail)--波头（尾）gaseous--insulation--气体绝缘Withstand test 耐压试验withstand--voltage--耐受电压Prime--mover--原动机XLPE(Cross Linked Polyethylene )交联聚乙烯（电缆）XLPE-cable-交链聚乙烯电缆(coaxial)-cable-(同轴)电缆Zero sequence current 零序电流Zinc oxide 氧化锌。
电气工程及其自动化专业英语
time-invariant 时不变的
self-(or mutual-)induction 自（互）感
displacement current 位移电流 conductance 电导
voltage drop 电压降 volt-ampere characteristics 伏安特性
metal-filament lamp 金属丝灯泡
seen, increase of current from zero to
I≈I1 causes the terminal voltage of the source to decrease linearly
V12=V=E－VS=E－RSI
Fig.1.3
In other words, the voltage drop VS across the source resistance rises in proportion to the current. This goes on until
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✓用动名词短语做主语
4) Changing resistance is a method for controlling the flow of the
current.
改变电阻是控制电流的一种方法
5) Conducting electricity means the flow of electrons through an
2)Instrument transformers are installed on the high-voltage equipment. 互感器安装在高压设备上
2.1 Grammar Features
3) Electric power is generated in power generating stations or plants.
电能是在发电站或发电厂产生的 4) The meters are calibrated and the scale is designed to read the
value of the desired unit. 这些仪表可以被校准并且设计了不同的量程 ，以便读出期望的数值。
5) Electrical energy can be stored in two metal plates separated by an insulation medium. Such a device is called a capacitor, and its ability to store electrical energy is termed capacitance. It is measured in ’Farads.
2.1 Grammar Features
3) We must do various experiments before a new electronic product is designed. Before designing a new electronic product we must do various experiments.
object.
传导电流意味着电子在物体内的流动
2.1 Grammar Features
② 分词
过去分词短语替代从句中的被动语态 现在分词短语替代从句中的主动语态
1)The power supply, which is shown in block-diagram in Fig.1, is a single-phase switch-mode inverter.
申报国家奖项 申请专利 发表学术论文：85％以上的科技资料都是以英语形式出版的
(3) 国际交流合作 专业英语表达、听说、应变能力
Lecture 2 Features of Specialized English
专业英语的特点
2.1 Grammar Features 语法特点
客观性（Objective）、准确性（accuracy）和精练性(conciseness)。 (1) 广泛使用被动语态 (2) 广泛使用非谓语形式 (3) 省略句使用频繁 (4) It句型和祈使句使用频繁 (5) 复杂长句使用频繁
1.2 学习专业英语的重要性
(1) 科研信息获取 专业英语阅读能力
当前大部分资料都可以通过互联网传播，而这些资料中90％以上都 是英语。
世界上科技情报资料的交流主要靠使用英语,对子电气工程、电子工 程和信息类等专业来说，绝大部分专业资料和信息都是以英语形式出 观。
(2) 研究成果展示 专业英语写作能力
隶属于科技英语 是科技英语的一部分，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、精练和正式。
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。
The power supply shown in block-diagram in Fig.1 is a single-phase switch-mode inverter.
电能可以储存在被一绝缘介质隔开的两块金属板中，这样的装置被称为电容 器，它储存电能的能力就被称为电容。电容的测量单位是法拉。
2.1 Grammar Features
(2)广泛使用非谓语形式 (精炼)
非谓语动词在句子中可以起到名词，形容词或副词作用，动词的非谓语 形式分为动名词,分词,动词不定式。
① 动名词
(6) 后置形容词短语作定语多
2.1 Grammar Features
(1) 广泛使用被动语态 (客观性)
主体多为客观的事物、现象和过程，在叙述推理过程中切忌加进作者 个人的主观臆断；
中心是客观现象及事物本身，而非动作的发出者，把论证说明的对象 置于句子主语的位置，既能突出中心，又能吸引读者的注意。 1) Electricity can be measured in amount and quality. 电可以用数量和质量来度量。
✓用动名词短语取代时间从句或简化时间陈述句
1)The signal should be filtered before it is amplified. The signal should be filtered before being amplified. 放大信号前，应先对其进行滤波
2) An object becomes hot. It is placed in the sun. Once being placed in the sun, an object becomes hot. 物体放置在太阳下会变热。
Lecture 1 Introduction
引言ቤተ መጻሕፍቲ ባይዱ
1.1 什么是专业英语
普通英语（Common English, Ordinary English）
科技英语（English for Science and Technology）
专业英语（English for Special Science and Technology）