计算:第一章、例题课后习题:1-2、电力系统的部分接线示于题图1-2,各电压级的额定电压及功率输送方向以标明在图中。试求(1)发电机及各变压器高、低绕组的额定电压;(2)各变压器的额定变比(3)设变压器T1工作于+5%抽头,T2、T4工作于主抽头,T3工作于—2.5%抽头时,各变压器的实际变比。解:(1)发电机的额定电压:10x105%=10.5kvT1低压侧:10x105%=10.5kvT1高压侧:220x110%=242kvT2低压侧:35x110%=38.5kvT2中压侧:110x110%=121kvT2高压侧:220kvT3低压侧:35kvT3高压侧:10x110%=11kvT4低压侧:110x110%=121kvT4高压侧:220kv(2)T1:T2T3:T4:(3)第二章、例题[例]500KV架空线路的参数为:,,,,线路长度为600km,计算线路Π型等值电路的参数:(1)不计线路参数的分布特性(近似值);(2)近似计及分布特性(修正参数法);(3)精确计及分布特性(精确参数)。解(1)ljxrZ)('00ljbgy)('00(2)867.060010956.3281.031131126200lbxKr934.0600)281.010956.32625.010956.3281.0(611)(61126622002000lxbrbxKx033.160010956.3281.01211121126200lbxKb)5.15765.13(600281.0934.060002625.0867.0'00jjlxjklrkZxrSjjlbjkyb36010452.260010956.3033.1'[例]三相双绕组变压器的型号为SFL40500/121,额定变比为121/10.5。求该变压器归算到高压侧的参数。kmr/02625.0000.281/xkm00g603.95610/bskmKW.PS423411%VSKW.P693031520.%I210405001214.23410332222NNTSPsVR4010405001211001110100%3232NNTSVVsXSVPGNT6330104.6101216.931022SVSIBNNT5330104.61012140500100315.210100%225.115.1012121NNTVVK2.1、110kv架空输电线路长70km,导线采用LGJ-120型钢芯铝线,计算半径r=7.6mm,相间距离为3.3m,导线分别按等边三角形和水平排列,试计算输电线路的等值电路参数,并比较分析排列方式对参数的影响。解:sr0由于是LGJ-120型钢芯铝线所以kmr/26.01205.310R=700r=18.375sbeqDDxlg1445.00等边三角形排列时,66.2708.6103.3lg1445.0707008.68.03.330xXmmrDmDDsbeq水平排列时,676.2808.610158.4lg1445.0707008.68.0158.426.130xXmmrDmDDsbeqG=0kmsrDbeqeq/10lg58.760由于是单导线,所以rreq等边三角形排列时,sbBmDDeq46310012.2106.7103.3lg58.770703.30水平排列时,sbBmDDeq46310938.1106.710158.4lg58.77070158.426.102.3、500kv输电线路长600km,采用三分裂导线3xLGJQ-400,分裂间距400mm,三相排列,相间距离为11m,LGJQ-400的导线运算半径r=13.6mm。试计算输电线路π型等值电路的参数;(2)近似计算分布特性(修正法)解:2.4、一台SFL-31500/35型双绕组三相变压器,额定变比为35/11,查得KWPs30,%5.30I,KWPs2.177,%8Vs,求变压器参数归算到高低压侧的有名值。解:(1)归算到高压侧的参数:第四章:4.1例题:各支路导纳已知,求节点导纳矩阵。45055.41001010jjjjjjjY第九章:9.1某系统典型日负荷曲线如图所示。计算:日平均负荷;负荷率mk,最小负荷系数以及峰谷差mPwSPdtWPdav85241241241240wPPPPPm705012042.012050minmaxminmax9.3、某工厂用电的年持续负荷曲线如图所示。试求:工厂全年平均负荷,全年耗电量及最大负荷利用小时数maxT。123-j10-j5j0.5j1解:5.47.959.01097.09.097.01097.03.1010***jjjQPSSQQQQPPPPVVVBBB4663108.210026.1lg1058.7lg1058.70131002405.31401008.01026.1lg1445.0lg1445.00000rDlrDlbBlgGlslrRrDlDDlxXeqeqsbeq(1)KVVVKVVVjVVKVjVjVVVVVXQRPVVXQRPVMVAjVBjQjSSB151051201206.12)4.14(6.124.14)6.124.14(5.2442)2(tan42212221.2.1.2.1.2''''2''''22''12(2)%7.93%1008.24242%1004.88.2)(122''2''22PPjjXRVQPS(3)首段电压偏移%2.9%100110110120%1001NNVVV末段电压偏移%5.4%100110110105%1002NNVVV