电气工程专业英语实用教程3
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电气工程专业英语课件lecture3-2012
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Lecture 3
Other considerations for an overhead line include: the number, size, and spacing of conductors per-phase bundle; the phase to phase spacing; the number, location, and conductor type for overhead neutrals concerning with lightning shielding; the level of insulation; ect. The design of a power line depends upon the following criteria: i) The amount of active power it has to transmit. ii) The distance over which the power must be carried. iii) The cost of the power line. iv) Esthetic considerations, urban congestion, ease of installation, and expected load growth.
Lecture 3
1. As the system expands and higher voltage levels become necessary for transmission, the older transmission lines are often relegated to subtransmission function. 随着系统的扩大和更高的电压等级为输电所必需， 随着系统的扩大和更高的电压等级为输电所必需，旧 的输电线路往往被移交给中压输电功能。 的输电线路往往被移交给中压输电功能。 New Words and Expressions backbone 中枢 integrated 综合的，完整的 综合的， voltage level 电压等级 step up 升压 step down 降压 subtransmission 中压输电，次输电 中压输电， subsystem 子系统 bulk 大量的 demarcation 划分 relegate to 委托给，移交给 委托给， overhead line 架空线 cable 电缆
Lecture 3
Other considerations for an overhead line include: the number, size, and spacing of conductors per-phase bundle; the phase to phase spacing; the number, location, and conductor type for overhead neutrals concerning with lightning shielding; the level of insulation; ect. The design of a power line depends upon the following criteria: i) The amount of active power it has to transmit. ii) The distance over which the power must be carried. iii) The cost of the power line. iv) Esthetic considerations, urban congestion, ease of installation, and expected load growth.
Lecture 3
1. As the system expands and higher voltage levels become necessary for transmission, the older transmission lines are often relegated to subtransmission function. 随着系统的扩大和更高的电压等级为输电所必需， 随着系统的扩大和更高的电压等级为输电所必需，旧 的输电线路往往被移交给中压输电功能。 的输电线路往往被移交给中压输电功能。 New Words and Expressions backbone 中枢 integrated 综合的，完整的 综合的， voltage level 电压等级 step up 升压 step down 降压 subtransmission 中压输电，次输电 中压输电， subsystem 子系统 bulk 大量的 demarcation 划分 relegate to 委托给，移交给 委托给， overhead line 架空线 cable 电缆
电气工程及其自动化专业英语第三章课文翻译
Semiconductor switches are very important and crucial components in power electronic systems.these switches are meant to be the substitutions of the mechanical switches,but they are severely limited by the properties of the semiconductor materials and process of manufacturing. 在电力电子系统，中半导体开关是非常重要和关键部件。
半导体开关将要替换机械开关,但半导体材料的性质和生产过程严重限制了他们。
Switching losses开关损耗Power losses in the power eletronic converters are comprised of the Switching losses and parasitic losses. 电力电子转换器的功率损耗分为开关损耗和寄生损耗the parasitic losses account for the losses due to the winding resistances of the inductors and transformers,the dielectric losses of capacitors,the eddy and the hysteresis losses. 寄生损失的绕组电感器、变压器的阻力、介电损耗的电容器,涡流和磁滞损耗the switching losses are significant and can be managed. 这个开关损耗是非常重要的,可以被处理。
they can be further divided into three components:(a)the on-state losses,(b)the off-state losses and the losses in the transition states. 他们可以分为三个部分: 通态损耗，断态损耗和转换过程中产生的损耗。
电气工程及其自动化专业英语完整ppt课件
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。
精选PPT课件
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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。
8
高电压工程
5
9
Unit 4 Digital Circuit and Analog Circuit
10
数字电路和模拟电路
6
11
Unit 5 Electrical Machine
12
电机
13
论文写作：学习科技文献的写作格式及写作技巧
7
14
国际会议international conference ：以某个国际会议为例，学习参加国际会议
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.
专业英语 电气工程P2U3教学课件
1 2 j
P (s)
s
n
s p 1 s p 2 ...
Returning to the characteristic equation of Eq. (2-3A-3) and solving for KZ(s)/P(s) yields Z(s) j ( 2 k 1 ) 180 K 1 1e k=0,1,2… P(s) Since -1 can be reprsented by a vector of unity magnitude and an angle that is an odd multiple of 180o. According to Eq.(2-3A-3) and Eq.(2-3A-4),we can find two criteria that make the characteristic function D(s) equal to zero , i.e, there are two criteria which can find system (close-loop) poles as K is increased from 0 to ∞.
P2U3A The Root Locus
第二部分第三单元课文A 根轨迹
plot v. 绘图 n. 曲线图 sketch v., n. （绘）草图，素描 facilitate v. 使容易，促进 coincide v. 一致 asymptote n. 渐进线 integer n. 整数 intersect v. 相交 real axis 实轴 symmetrical adj. 对称的 breakaway point 分离点 arrival point 汇合点 departure angle 出射角 arrival angle 入射角 thereof adv. 将它（们） imaginary axis 虚轴 passive adj. 被动的，无源的
P (s)
s
n
s p 1 s p 2 ...
Returning to the characteristic equation of Eq. (2-3A-3) and solving for KZ(s)/P(s) yields Z(s) j ( 2 k 1 ) 180 K 1 1e k=0,1,2… P(s) Since -1 can be reprsented by a vector of unity magnitude and an angle that is an odd multiple of 180o. According to Eq.(2-3A-3) and Eq.(2-3A-4),we can find two criteria that make the characteristic function D(s) equal to zero , i.e, there are two criteria which can find system (close-loop) poles as K is increased from 0 to ∞.
P2U3A The Root Locus
第二部分第三单元课文A 根轨迹
plot v. 绘图 n. 曲线图 sketch v., n. （绘）草图，素描 facilitate v. 使容易，促进 coincide v. 一致 asymptote n. 渐进线 integer n. 整数 intersect v. 相交 real axis 实轴 symmetrical adj. 对称的 breakaway point 分离点 arrival point 汇合点 departure angle 出射角 arrival angle 入射角 thereof adv. 将它（们） imaginary axis 虚轴 passive adj. 被动的，无源的
电气工程专业英语实用教程
rases
succeeding [sEk5si:diN] adj. 以后的，随后的 logic 0 逻辑0 logic 1 逻辑1 programmable controller 可编程控制器 BCD 二进制编码的十进制 thumbwheel switch 指轮开关 hexadecimal [heksE5desIm(E)l] adj. 十六进制的n. 十六进制 multiply [5mQltipli] v.乘,增加 remainder [ri5meindE] n. 余数adj. 剩余的 conversion of number 数字转换
Notes
[2] The hexadecimal system is used in PLCs because it allows the status of a large number of binary bits to be represented in a small space such as on a computer screen or programming device display. 本句是由because连接的因果句。在because从句中，主语 为it，谓语是allow…to…，此外还有一个词组such as举例 说明什么样的small space。结构清楚了，这句话虽然看 起来很长，实际上理解起来也不困难。
New Words And Phrases
Text
请老师朗读并讲解课文
Notes
[1] PLC is a computer. It stores information in the form of On or Off conditions (1 or 0), referred to as binary digits (bits). 本句涉及的是一个词组refer to sth as（称某物为……）。 完整的句子应该是： It stores information in the form of On of Off conditions(1or 0), which is referred to as binary digits (bits).本句省略了连词which，因此is也省略。
succeeding [sEk5si:diN] adj. 以后的，随后的 logic 0 逻辑0 logic 1 逻辑1 programmable controller 可编程控制器 BCD 二进制编码的十进制 thumbwheel switch 指轮开关 hexadecimal [heksE5desIm(E)l] adj. 十六进制的n. 十六进制 multiply [5mQltipli] v.乘,增加 remainder [ri5meindE] n. 余数adj. 剩余的 conversion of number 数字转换
Notes
[2] The hexadecimal system is used in PLCs because it allows the status of a large number of binary bits to be represented in a small space such as on a computer screen or programming device display. 本句是由because连接的因果句。在because从句中，主语 为it，谓语是allow…to…，此外还有一个词组such as举例 说明什么样的small space。结构清楚了，这句话虽然看 起来很长，实际上理解起来也不困难。
New Words And Phrases
Text
请老师朗读并讲解课文
Notes
[1] PLC is a computer. It stores information in the form of On or Off conditions (1 or 0), referred to as binary digits (bits). 本句涉及的是一个词组refer to sth as（称某物为……）。 完整的句子应该是： It stores information in the form of On of Off conditions(1or 0), which is referred to as binary digits (bits).本句省略了连词which，因此is也省略。
电气工程专业英语第3章
refer to A about B 参考A关于B的部分
consist of battery
由...组成 n. 电池 电压降 vt. 阐明, 说明(问题等)，启发, 启蒙 n. 否定, 负数adj. 否定的, 消极的, 负的, 阴
voltage drop illuminate negative
性的vt. 否定, 拒绝(接受) positive adj. 阳的adj. 肯定的, 积极的, 绝对的, 确实 的adj. [数]正的 schematic Ohm’s Law adj. 示意性的 欧姆定律
be referred to as 叫做，被认为是， The voltage across a resistor is referred to as a voltage drop. 电阻器两端之间的电压叫做电压降。 An item of data is referred to as an item. 一组材料将被视为 一个单位 refer to 涉及，指的是，称为 Power electronics refers to control and conversion of electrical power by power semiconductor devices电力电子 学是指利用电力半导体器件对电能进行控制和变换的学科 refer to A as B 把A称为B，把A当作B refer A to B 认为A是B引起的，把A归于B类，用B来表示A
load
the dead [static] load恒载，静(荷)载，自重。
the live [moving, mobile] load活负载，动荷载。
the peak load最大负载，峰负载
the permissible load容许负载
电气工程及其自动化专业英语
• With time-invariant currents and voltages, the magnetic and electric fields of the associated electric plant are also timeinvariant. This is the reason why no e.m.f.s of self- (or mutual-)induction（自感或互感）appear in D.C. circuits, nor are there （倒装结构）any displacement currents （位移电 流）in the dielectric surrounding the conductors(导体周围的 电介质）.
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
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
电气工程及其自动化专业英语第三章section_3-2
Chapter 3 Power Electronic Technology
Section 2 The DC-DC Converters
Text New Words and Expressions Transition of part of speech Exercises End
Section 2 The DC-DC Converters
Section 2 The DC-DC Converters
If the duty ratio D is made a linear function of uC, a control voltage
D = ku C
U o = (kU S )u C
(3-6)
The output voltage is then a linear function of the control voltage. This is also the principle of switchmode linear amplifier. The gain of this amplifier is determined by the input dc source voltage. Neglecting the power losses in the circuit elements, we could use the equation of the balance of power
Section 2 The DC-DC Converters
US I S = Uo Io
− −
(3-7)
where IS is the average current from the DC source. Hence,
Io
−
=
Section 2 The DC-DC Converters
Text New Words and Expressions Transition of part of speech Exercises End
Section 2 The DC-DC Converters
Section 2 The DC-DC Converters
If the duty ratio D is made a linear function of uC, a control voltage
D = ku C
U o = (kU S )u C
(3-6)
The output voltage is then a linear function of the control voltage. This is also the principle of switchmode linear amplifier. The gain of this amplifier is determined by the input dc source voltage. Neglecting the power losses in the circuit elements, we could use the equation of the balance of power
Section 2 The DC-DC Converters
US I S = Uo Io
− −
(3-7)
where IS is the average current from the DC source. Hence,
Io
−
=
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type of load, and a conductor to allow electrons to flow between the voltage source and the load. 本句中的谓语动词是consist of，意为“由……组成”。to allow electrons to flow between the voltage source and the load 修饰的是 conductor ，表明是什么样的导线，而不是 整个句子。
calculate [5kAlkjuleit] v. 计算, 考虑, 计划, 打算v. <美>以为, 认为 series circuit 串联电路
equation [i5kweiFEn] n. 相等, 平衡, 综合体, 因素, 方程式, 等式 series resistance be referable to voltage drop 串联电阻 可归因于, 与...有关 电压降
后又是一个宾语从句，省略了引导词 that。在这个宾语从句中，
主语为the sum of voltage drops，谓语为equals，宾语为the total voltage。
Notes
[5] If voltage were measured across any single resistor, the
meter [5mi:tE] n. 仪表,米,公尺,计,表 divider [di5vaidE] n. 分割者, 间隔物, 分配器
Text
请老师朗读并讲解课文
Notes
[1] A simple electric circuit consists of a voltage source, some
Notes
[4] A German physicist, Kirchhoff , formulated a law which states the sum of the voltage drops across the resistances of a closed circuit equals the total voltage applied to the circuit. 看懂这个句子的关键是分析它的句子结构。这是一个多层从句 的句子。全句的主语是A German physicist，谓语是formulated， 宾语是a law， Kirchhoff是同位语。which引导的定语从句修饰a law 。在该定语从句， which 做主语， states 是谓语动词， states
negative [5ne^Etiv] n. 否定, 负数adj. 否定的, 消极的, 负的, 阴性
的vt. 否定, 拒绝(接受) positive [5pCzEtiv] adj. 阳的 adj. 肯定的, 积极的, 绝对的, 确实的 adj. [数]正的 schematic [ski5mAtik] adj. 示意性的 voltmeter [`vEJlt9mi:tE(r)] n. 伏特计 ammeter [5AmitE] n. 电表 Ohm’s Law 欧姆定律
New Words And Phrases
mathematician [7mAW imE5tiFEn] n. 数学家
vary [5vZEri] vt. 改变, 变更, 使多样化vi. 变化, 不同, 违反 inverse [5in5vE:s] adv. 相反地, 倒转地
derive [di5raiv] vt. 得自 vi. 起源
meter would read three volts 注意，“表的读数为……”的表达是本句中的meter would read，而不是meter would be read。read 应理解“显示， 指示”。 例如，The dial reads 32. 刻度显示出32°。
参考译文
简单电路
designer [dI5zaInE(r)] n. 设计者 lamp [lAmp] n. 灯
relationship [ri5leiFEnFip] n. 关系, 关联
analysis [E5nAlisis] n. 分析, 分解
New Words And Phrases
triangle [5traiAN^l] n. 三角形
Unit 3
Simple Electric Circuit
退出
New Words And Phrases
circuit [5sE:kit] n. 电路, 一圈, 周游, 巡回
fundamental [7fQndE5mentl] adj. 基础的, 基本的 consist of 由...组成
load [lEud] n. 负荷,负载, 加载
Notes
[2] To use the triangle, cover the value you want to calculate. The
remaining letters make up the formula. 这两个句子关系紧密，要联系起来理解。后一个句子表明 的是使用三角形，盖住要计算的值的结果是，剩下的字母 组成公式。
battery [5bAtEri] n. 电池 component [kEm5pEunEnt] n. 成分
switch [switF] n. 开关, 电闸, 转换
illuminate [i5lju:mineit] vt. 阐明, 说明(问题等)， 启发, 启蒙
New Words And Phrases
Notes
[3] A series circuit is formed when any number of resistors
are connected end-to-end so that there is only one path for current to flow[4]. 本句中的end to end不能凭字面理解为尾对尾，而是首 尾相连的意思。so that引导了一个结果状语从句。when 引导的从句作状语，指明串联电路形成的条件。
calculate [5kAlkjuleit] v. 计算, 考虑, 计划, 打算v. <美>以为, 认为 series circuit 串联电路
equation [i5kweiFEn] n. 相等, 平衡, 综合体, 因素, 方程式, 等式 series resistance be referable to voltage drop 串联电阻 可归因于, 与...有关 电压降
后又是一个宾语从句，省略了引导词 that。在这个宾语从句中，
主语为the sum of voltage drops，谓语为equals，宾语为the total voltage。
Notes
[5] If voltage were measured across any single resistor, the
meter [5mi:tE] n. 仪表,米,公尺,计,表 divider [di5vaidE] n. 分割者, 间隔物, 分配器
Text
请老师朗读并讲解课文
Notes
[1] A simple electric circuit consists of a voltage source, some
Notes
[4] A German physicist, Kirchhoff , formulated a law which states the sum of the voltage drops across the resistances of a closed circuit equals the total voltage applied to the circuit. 看懂这个句子的关键是分析它的句子结构。这是一个多层从句 的句子。全句的主语是A German physicist，谓语是formulated， 宾语是a law， Kirchhoff是同位语。which引导的定语从句修饰a law 。在该定语从句， which 做主语， states 是谓语动词， states
negative [5ne^Etiv] n. 否定, 负数adj. 否定的, 消极的, 负的, 阴性
的vt. 否定, 拒绝(接受) positive [5pCzEtiv] adj. 阳的 adj. 肯定的, 积极的, 绝对的, 确实的 adj. [数]正的 schematic [ski5mAtik] adj. 示意性的 voltmeter [`vEJlt9mi:tE(r)] n. 伏特计 ammeter [5AmitE] n. 电表 Ohm’s Law 欧姆定律
New Words And Phrases
mathematician [7mAW imE5tiFEn] n. 数学家
vary [5vZEri] vt. 改变, 变更, 使多样化vi. 变化, 不同, 违反 inverse [5in5vE:s] adv. 相反地, 倒转地
derive [di5raiv] vt. 得自 vi. 起源
meter would read three volts 注意，“表的读数为……”的表达是本句中的meter would read，而不是meter would be read。read 应理解“显示， 指示”。 例如，The dial reads 32. 刻度显示出32°。
参考译文
简单电路
designer [dI5zaInE(r)] n. 设计者 lamp [lAmp] n. 灯
relationship [ri5leiFEnFip] n. 关系, 关联
analysis [E5nAlisis] n. 分析, 分解
New Words And Phrases
triangle [5traiAN^l] n. 三角形
Unit 3
Simple Electric Circuit
退出
New Words And Phrases
circuit [5sE:kit] n. 电路, 一圈, 周游, 巡回
fundamental [7fQndE5mentl] adj. 基础的, 基本的 consist of 由...组成
load [lEud] n. 负荷,负载, 加载
Notes
[2] To use the triangle, cover the value you want to calculate. The
remaining letters make up the formula. 这两个句子关系紧密，要联系起来理解。后一个句子表明 的是使用三角形，盖住要计算的值的结果是，剩下的字母 组成公式。
battery [5bAtEri] n. 电池 component [kEm5pEunEnt] n. 成分
switch [switF] n. 开关, 电闸, 转换
illuminate [i5lju:mineit] vt. 阐明, 说明(问题等)， 启发, 启蒙
New Words And Phrases
Notes
[3] A series circuit is formed when any number of resistors
are connected end-to-end so that there is only one path for current to flow[4]. 本句中的end to end不能凭字面理解为尾对尾，而是首 尾相连的意思。so that引导了一个结果状语从句。when 引导的从句作状语，指明串联电路形成的条件。