第4課-基本電路定律、發(fā)電機(jī)課件

1、Section 2 Circuit ElementsvThere are two types of elements (components) founded in electric circuits: passive elements and active elements.Book P5vWhat is passive elements? vWhat is active elements?vActive power and reactive powervAn active element is capable of generating energy while a passive ele

2、ment is not.ResistorCapacitorInductorTransistorVoltage and Current source vOhms 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 3 Ohms LawBook

3、P10Kirchhoffs Current Law is given bySection 4 Kirchhoffs Law Book P14Kirchhoffs 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 t

4、he 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 risesSome words: (1) topology 拓?fù)洌負(fù)鋵W(xué)，拓?fù)浣Y(jié)構(gòu)The topology of the network may be ring, star or

5、bus.網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)可以是環(huán)形的、星形的或總線形的。(2) Clockwise 順時針方向（的）； Counterclockwise 逆時針方向（的）； Do the vanes in the figure rotate clockwise or counterclockwise?圖中葉片的旋轉(zhuǎn)方向是順時針的,還是反時針的? Section 5 Basic Analysis Methods(Circuit Theorems) Book P185. .1 疊加定理疊加定理 (Superposition Theorem)5. .2 替代定理替代定理 (Substitution Theorem)5

6、. .3 戴維南定理和諾頓定理戴維南定理和諾頓定理 (Thevenin-Norton Theorem)5. .4 特勒根定理特勒根定理(Tellegens Theorem)5. .5 互易定理互易定理 (Reciprocity Theorem)5. .6 對偶原理對偶原理 (Dual Principle)Nodal AnalysisMesh AnalysisSome words: (1) wye-connected Y形連接，星形連接(2) delta-connected 形連接，三角形連接 (3) be 120out of phase 相位相差120度(4) Phase sequence 相

7、序 positive sequence; negative sequence; zero sequenceBook P65 Chapter 4Section 1 Principle of Operation of an Inductive machineThe left-hand rule is applicable to charged conductor moving in a magnetic field , that is applicable to the motor , while the right-hand rule is applicable to an electromag

8、netic induction phenomenon , that is applicable to the generator .Motor and generator同步電機(jī)同步電機(jī) (Synchronous Generator )汽輪發(fā)電機(jī)汽輪發(fā)電機(jī)- -轉(zhuǎn)速高、離心力大轉(zhuǎn)速高、離心力大- -隱極式隱極式non-salient pole distributed polar 水輪發(fā)電機(jī)水輪發(fā)電機(jī)- -轉(zhuǎn)速低、極數(shù)多轉(zhuǎn)速低、極數(shù)多- -凸極式凸極式salient pole 同步電機(jī)的結(jié)構(gòu)同步電機(jī)的結(jié)構(gòu)stator core hydrogen condenser Slip ring一、隱極同步

9、發(fā)電機(jī)的基本結(jié)構(gòu)一、隱極同步發(fā)電機(jī)的基本結(jié)構(gòu)field windings 汽輪發(fā)電機(jī)轉(zhuǎn)子鐵心的汽輪發(fā)電機(jī)轉(zhuǎn)子鐵心的銑槽銑槽(Slotting)二、水輪發(fā)電機(jī)結(jié)構(gòu)二、水輪發(fā)電機(jī)結(jié)構(gòu)(Hydrogenerator, Hydroturbine)(1)(1)立式水輪發(fā)電機(jī)立式水輪發(fā)電機(jī)(2)(2)臥式水輪發(fā)電機(jī)臥式水輪發(fā)電機(jī)Vertical hydrogenerator Horizontal turbine(3)燈泡貫流式水輪發(fā)電機(jī)燈泡貫流式水輪發(fā)電機(jī)(bulb tubular turbine generator )10000kW10000kW水輪機(jī)轉(zhuǎn)子水輪機(jī)轉(zhuǎn)子水輪發(fā)電機(jī)模型水輪發(fā)電機(jī)模型v發(fā)電機(jī)定子機(jī)座外徑達(dá)21.4米，在工廠制造完成后，分?jǐn)?shù)搬運(yùn)至工地，吊入機(jī)坑焊接拼裝。 定子繞組設(shè)計為三定子繞組設(shè)計為三相雙層波形繞組，相雙層波形繞組，每相每相5支路并聯(lián)，支路并聯(lián)，共共1080根羅貝爾根羅貝爾線棒組成。繞組輪線棒組成。繞組輪換數(shù)為換數(shù)為1814，每極每相槽數(shù)為每極每相槽數(shù)為9/4，節(jié)距為，節(jié)距為13 發(fā)電機(jī)定子總裝配發(fā)電機(jī)定子總裝配發(fā)電機(jī)定子總裝配發(fā)電機(jī)定子總裝配v發(fā)