第4课-基本电路定律、发电机讲述.ppt

Section 2 Circuit Elements There are two types of elements (components) founded in electric circuits: passive elements and active elements. Section 3 Ohm’s Law Ohm’s Law states that the voltage across a resistor is directly proportional to the current flowing through the resistor. The constant of proportionality is the resistance value of the resistor in ohms. Section 4 Kirchhoffs Law Section 5 Basic Analysis Methods(Circuit Theorems) Book P18 Nodal Analysis Mesh Analysis Book P65 Chapter 4Section 1 Principle of Operation of an Inductive machine Motor and generator 同步电机的结构 一、隐极同步发电机的基本结构 二、水轮发电机结构(Hydrogenerator, Hydroturbine) 三峡电站 Three Gorges hydropower station 发电机定子机座外径达21.4米，在工厂制造完成后，分数搬运至工地，吊入机坑焊接拼装。 发电机定子总装配发电机定子总装配 定子绕组设计为三相双层波形绕组，每相5支路并联，共1080根罗贝尔线棒组成。绕组轮换数为1—8—14，每极每相槽数为9/4，节距为13 三峡电站 发电机转子是水轮机组中，整体吊装重量最重的部件，直径18米，重量超过1800吨，安装间隙只有3厘米。 异步电动机(Asynchronous Generator ) * * Book P5 What is passive elements? What is active elements? Active power and reactive power An active element is capable of generating energy while a passive element is not. Resistor Capacitor Inductor Transistor Voltage and Current source Book P10 Kirchhoffs Current Law is given by Book P14 Kirchhoffs Current Law (KCL) states that the algebraic sum of currents entering a node (or a closed boundary) is zero. An alternative form of KCL: The sum of the currents entering a nod is equal to the sum of the currents leaving the node. Kirchhoffs Voltage Law: Kirchhoffs Voltage Law (KVL) states that the algebraic sum of all voltages around a closed path (or loop) is zero. An alternative form of KVL: Sum of voltage drops= Sum of voltage rises Some words: (1) topology 拓扑，拓扑学，拓扑结构 The topology of the network may be ring, star or bus. 网络的拓扑结构可以是环形的、星形的或总线形的。 (2) Clockwise 顺时针方向（的）； Counterclockwise 逆时针方向（的）； Do the vanes in the figure rotate clockwise or counterclockwise? 图中叶片的旋转方向是顺时针的,还是反时针的? 5.1 叠加定理 (Superposition Theorem) 5.2 替代定理 (Substitution Theorem) 5.3 戴维南定理和诺顿定理