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1、2020-6-2 - 1 - 第二章21110 kV 架空线路长70 km ， 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：取rDS8 .0(1)等边三角形排列，mDDeq3.3375.18701205.31lSlrRO?66.27706 .78 .0103.3lg1445.0lg1445. 03lDDlxXseqO?463610012.270106. 7103.3lg58.710lg58. 7lrDlbBeqeqO(2)水平排列，mDDeq158.42
2、6.1375.18701205 .31lSlrRO?676.28706 .78. 010158.4lg1445.0lg1445.03lDDlxXseqO?463610938.170106.710158.4lg58. 710lg58. 7lrDlbBeqeqO电阻与导线的排列方式无关，相间几何均距越大，等值电抗越大，等值电纳略有越小。24有一台 SFLl 31500 35 型双绕组三相变压器，额定变比为3511，查得%,8,2 .177%,2 .1,3000SSVkWPIkWP求变压器参数归算到高、低压侧的有名值。解：MVASkVVkVVNNN5 .31,11,3521由题意知(1) 归算到高压
3、侧的参数2188.05.313510002.177100022221NNSTSVPR11. 35 .31351008221NNSTSVVXSSVPGNT5221010449.235110003011000SSVSIBNNT4221010086. 3355 .311002. 1精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 1 页，共 8 页2020-6-2 - 2 - (2) 归算到低压侧的参数0216.05.311110002.177100022222NNSTSVPR3073.05.31111008222NNSTSVVXSSVPGNT422201
4、0479.211110003011000SSVSIBNNT3222010124. 3115.311002 .125有一台型号为SFL-40000 220 的三相三绕组变压器，容量比为100l00100，额定变比22038.511，查得,217%,9.0,8.46)21(00kWPIkWPS,7 .200)31(kWPS%,6%,5.10%,17,6.158)32()31()21()32(SSSSVVVkWP试求归算到高压侧的变压器参数有名值。解：MVASkVVkVVkVVNNNN40,11, ,5 .38,220321由题意知,三个容量相等。先求等值电阻。kWkWPPPPkWkWPPPPkWk
5、WPPPPSSSSSSSSSSSS15.71)2176 .1587 .200(21)(2145.87)7.2006 .158217(21)(2155.129)6.1587.200217(21)(21)21()32()31(3)31()32()21(2)32()31()21(1所以：152.240220100015.711000645.240220100045.871000919.340220100055.1291000222213322221222222111NNSNNSNNSSVPRSVPRSVPR那么：同理求出等值电抗。%25.0%)17%6%5.10(21)(21%25.6%)5.10%
6、6%17(21)(21%75.10%)6%5 .10%17(21)(21)21()32()31(3)31()32()21(2)32()31()21(1SSSSSSSSSSSSVVPVVVVVVVVV精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 2 页，共 8 页2020-6-2 - 3 - 025.34022010025.0625.754022010025.6075.1304022010075.10221332212222111NNSNNSNNSSVVXSVVXSVVX最后求出等值导纳。SSVPGNT7221010669.9220110008.4
7、611000SSVSIBNNT6222010438.7220401009.026有一台型号为SFSL-31500 110的三相三绕组变压器，容量比为100l0066.7，额定变比11038.511，,450var,850,80)21(0kWPkkWPS?励磁功率,240)31(kWPS?%,5 .8%,21%,55.11,270)32()31()21()32(?SSSSVVVkWP试求归算到各电压级的参数。解：MVASkVVkVVkVVNNNN5 .31,11, ,5 .38,110321由题意知,三个容量不相等，短路损耗要折算。kWkWSSPPkWkWSSSPPkWkWSSPPNNSSNNN
8、SSNNSS46.5397 .66100240893.6067.66100270,min450100100450223)31()31(2232)32()32(222)21()21(?kWkWPPPPkWkWPPPPkWkWPPPPSSSSSSSSSSSS1765.348)450893.60646.539(21)(217165.258)46.539893.606450(21)(212835.191)893.60646.539450(21)(21)21()32()31(3)31()32()21(2)32()31()21(1所以：%975.8%)55.11%5.8%21(21)(21%475.0%)
9、21%5.8%55.11(21)(21%025.12%)5.8%21%55.11(21)(21)21()32()31(3)31()32()21(2)32()31()21(1SSSSSSSSSSSSVVPVVVVVVVVV精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 3 页，共 8 页2020-6-2 - 4 - （1）折算到高压侧。246.45.3111010001765.3481000155.35.3111010007165.2581000333.25 .3111010002835.1911000222213322221222222111NNS
10、NNSNNSSVPRSVPRSVPR那么：同理求出等值电抗。475.345 .31110100975.8825.15.31110100475.0191.465 .31110100025.12221332212222111NNSNNSNNSSVVXSVVXSVVX最后求出等值导纳。SSVPGNT6221010612.6110110008011000SSVQBNT5221010025.71101100085011000（2）折算到中压侧。52.05.315.3810001765.34810003865.05.315.3810007165.25810002857.05 .315 .381000283
11、5.1911000222223322222222222211NNSNNSNNSSVPRSVPRSVPR那么：同理求出等值电抗。223.45.315 .38100975.82235.05 .315.38100475.0658.55 .315.38100025.12222332222222211NNSNNSNNSSVVXSVVXSVVX最后求出等值导纳。SSVPGNT5222010397.55.38110008011000精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 4 页，共 8 页2020-6-2 - 5 - SSVQBNT4222010735.
12、55.381100085011000（3）折算到低压侧。04246.05.311110001765.348100003155.05 .311110007165.258100002333.05.311110002835.1911000222233322223222222311NNSNNSNNSSVPRSVPRSVPR那么：同理求出等值电抗。34475.05 .3111100975.801825.05.3111100475.046191.05.3111100025.12223332232222311NNSNNSNNSSVVXSVVXSVVX最后求出等值导纳。SSVPGNT4223010612.61
13、1110008011000SSVQBNT3223010025.711110008501100029系统接 线 如题图2 9(a) 所示。已知各元件参数如下。发电机%.27,5.10,30:xkVVMVASGNN变压器%.5.10,121/5.10,5.31:1STNVkMVAST变压器%.5 .10, 6.6/110,15:3,2STNVkMVASTT线路./4 .0,100:kmxkmlL电抗器%.6,5.1,6:RNNxkAIkVVR试作不含磁耦合关系的等值电路并计算其标么值参数。解：kVVMVASBB5.10,100)1(选kVkVkVVkVkVkVVTBBTBB26.76 .6/110
14、121121121/5.105 .10)2()3()1()2(精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 5 页，共 8 页2020-6-2 - 6 - 发电机9 .05 .10100305 .1027.0:222)1(2221BBNNBBNNGVSSVxSVSVxXx变压器3333.01211005.31121105.0:1222)2(222)2(2212BBNNSBBNNSTVSSVVSVSVVXxT线路1366.01211001004.0212121:22)2(2)2(3BBBBLVSxlSVxlXxL5785.0121100151101
15、05.0:3, 2222)2(212)2(213254BBNNSBBNNSTTVSSVVSVSVVXXxxTT变压器电抗器2629.026.71005.13606.033:22)3(2)3(6BBNNRBBNNRRVSIVxSVIVxXxR210 对题 2 9(a)的电力系统，若选各电压级的额定电压作为基准电压，试作合理想变压器的等值电路井计算其参数的标么值。解：kVVkVVkVVMVASBBBB6,110,10,100)3()2()1(选99225.010100305.1027.0222)1(2221BBNNBBNNGVSSVxSVSVxXx0.5785 3 2 1 0.1366 0.333
16、3 0.9 6 5 0.2629 0.5785 等值系统图4 精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 6 页，共 8 页2020-6-2 - 7 - 3675. 0101005.315.10105.0222)1(212)1(2212BBNNSBBNNSTVSSVVSVSVVXx0476. 110/1105.10/121)12()12(1BTITkkk1653.01101001004 .021212122)2(2)2(3BBBBLVSxlSVxlXx7. 011010015110105. 0222)2(212)2(213254BBNNSBBN
17、NSTTVSSVVSVSVVXXxx9091.06/1106.6/110)32()32(232BTTTkkkk3849.061005.13606.03322)3(2)3(6BBNNRBBNNRRVSIVxSVIVxXx211 各电压级均选平均额定电压作为基准电压，并近似地认为各元件的额定电压等于平均额定电压，重作上题的等值电路并计算其参数标么值。解：kVVkVVkVVMVASBBBB3.6,115,5.10,100)3()2()1(选9 .03010027.01NBGSSxXx3333.05 .31100105.012NBSTSSVXx0.99225 1 2 3 5 4 6 0.3675 0.
18、1653 0.7 0.7 0.3849 1:1.0476 0.9091:1 0.9091:1 等值系统图精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 7 页，共 8 页2020-6-2 - 8 - 1512.01151001004. 021212122)2(2)2(3BBBBLVSxlSVxlXx7.015100105. 03254NBSTTSSVXXxx3491.03 .61005.13606.03322)3(2)3(6BBNNRBBNNRRVSIVxSVIVxXx0.9 1 2 3 5 4 6 0.3333 0.1512 0.7 0.7 0.3491 等值系统图精选学习资料 - - - - - - - - - 名师归纳总结 - - - - - - -第 8 页，共 8 页