XX大学电力学院课程设计设计-1--1第一章电气主接线的设计第1.1节主接线设计方案的选择根据给定的任务书,进行分析1、10KV出线回路数为12回。2、110KV出线回路数为7回。3、I、II类负荷占百分数为60%以上。4、电厂在系统中所占的重要比重为100/1000=10%。5、电厂直配负,电厂的功率因数cos0.8,。6、发电厂运行方式最大负荷时三台机组满发时为25250100MW,最小负荷时两台机组满发时为2524090MW,多余功率送回系统,功率缺额由系统供给。7、12回近区负荷加限流电抗器。8、两台25MW机组由于给近区负荷供电应该采用有母线的接线形式,采用单母分段或者双母线的接线形式。9、配电装置的每组接线上,应装设避雷器,单元连接的发电机出线应装一组避雷器直接接地,系统加装避雷器容量为25MW以上的直配发电机,应在每台电机出线处装一组避雷器。10、互感器的加装,凡装有断路器回路的应装设电流互感器,发电机和变压器的中性点,发电机和变压器的出口加电流互感器,6—220KV电压等级的每组母线的三相上应装设电压互感器,出线侧的一相上应装设电压互感器。电抗器的选择和确定:故障时:电缆出线上的电抗器max1822120.223cos3100.8gNPIKAU正常时:单母分段上的电抗器gmax70%2570%1.051.051262.83cos3100.8NPIAU电抗器参数表型号额定电压(KV)额定电流(A)动稳定(A)1S热稳定(A)NKL-10-300-41030019100174500NKL-10-1500-81015004780059800XX大学电力学院课程设计设计-2--2第1.2节方案设置根据工程情况、电厂在电力系统中的地位和作用、负荷情况及其他因素的影响,对发电厂的主接线进行设计,然后选出两种比较好的方案如下所示。方案一XX大学电力学院课程设计设计-3--3方案二技术比较由于10KV侧的两台发电机容量比较小采用单母分段和双母线均可满足可靠性和灵活性要求.经济比较计算综合投资:))(1001(0万元ZZ0Z---为主体设备的综合投资,包括变压器,开关设备,配电装备等设备的综合投资--为不明显的附加费用比例系数,一般220KV取70,110KV取90XX大学电力学院课程设计设计-4--4由于110KV侧所选的接线形式一样所以只比较10KV侧经济比较:设备方案一方案二母线7.5+0.55*6(万元)27+2.9*6(万元)隔离开关18*0.1(万元)22*0.1(万元)电抗器13*0.5(万元)12*0.5(万元)总造价19.1(万元)52.6(万元)根据经济技术比较得出方案一为最优方案第二章厂用电的设计根据设计要求,参考《发电厂电气部分课程设计参考资料》得到设计方案厂用变压器容量的选择:厂备用变压器容量(22550)7%8.750.8SMVA25MW变压器容量1257%257%2.19cos0.8NSMVAXX大学电力学院课程设计设计-5--550MW变压器容量2507%507%4.38cos0.8NSMVA型号及容量(KVA)高压侧额定电压(KV)低压侧额定电压(KV)连接组别阻抗电压(%)空载电流(%)SJL1-25000106.3/11Y5.51.3SJL1-50000106.3/11Y5.51.1SJL1-100000106.3/11Y120.8第三章短路计算第3.1节变压器标么值的计算1.等值电抗的计算:①发电机95.138.0251000436.021nbFNGGSSXXX184.38.0501000199.03NbFnGSSXX②主变10021KTTUXX2.42500010001005.10NbSS875.012000010001005.101003NbKTSSUX③厂变225.210001005.510021NbKCCSSUXX110.510001005.51003NbKCSSUX120.10100010012100NbKbSSUXXX大学电力学院课程设计设计-6--6④电抗器KAUSIbbb555.1031000398.610045.103.010551001bNNbKKUIUIXX79.210085.105.110551002bNNbKKUIUIXX⑤系统55.041.030115100004.004.0202lXUSXbbS2.做等值电路及短路点的选择:第3.2节转移电抗的计算1.1f短路发电厂一页图一将221,,KTTXXX三个电抗Y得576.11X047.132XX求1212XXXXGff//SX//33TGXX=576.12047.195.13//0.55//875.0184.3=0.46XX大学电力学院课程设计设计-7--7分布系数1fC84.055.046.01C11.006.446.02C025.0211.084.0187CC55.0fsX4.18025.046.021XX06.43fX求计算电抗55.0jsX575.08.01000254.18cos121bNfjjSPXXX25.08.010005006.43jX2.2f短路:等值电路:同1的计算,得:047.1576.148.01211109XXXX变换后得:378.2ffX分布系数:XX大学电力学院课程设计设计-8--8093.064.0733.064.0733.055.048.0733.0097.083.0097.0526.15819.183.083.0117.0195.13378.2332121ESEEEECCCCCCC则各支路转移电抗:72.364.0378.257.25093.0378.252.24097.0378.299.1317.0378.2332211ESfffSEfffEfffEfffCXXCXXCXXCXX求计算电抗:XX大学电力学院课程设计设计-9--9269.072.3172.328.110005057.25613.010002552.2435.010002599.1332111IXXXSSXXjSjjBfj3.3f短路:等效化简同2f短路:则为:378.1412378.2ffX分布系数同2f短路则:各支路短路电抗:47.2264.0378.146.154093.0378.1423.148097.0378.1458.8417.0378.14321fSfffXXXX求计算电抗:045.047.22147.22129.073.7173.71000506.15427.071.3171.310002523.14811.210002558.84100025332211jSfSjjjjfjIXIXIXXXXX大学电力学院课程设计设计-10--10f4短路:转移电抗:358.998.6378.2ffX分布系数同上,则:62.1464.0358.962.100093.0358.947.96097.0358.905.5517.0358.9321fSfffXXXX求计算电抗068.062.141181.062.1453.510005062.10041.210002547.9638.110002505.5533321jjJSjjjIIXXXX5.5f短路:转移电抗:378.2422378.2ffX分布系数同上.则:091.3864.0378.2413.262093.0378.2432.251097.0378.244.143117.0378.243321ffffXXXX求计算电抗:XX大学电力学院课程设计设计-11--1111.1310005013.26216.0279.0283.610002532.251585.31000254.14332121jjjjjXIIXX026.0076.0091.383jsjjsIIX6.6f短路:等效变换:XX大学电力学院课程设计设计-12--120.55+1.576=2.126499.72047.195.13656.1499.7126.2499.7126.21.656+0.875=2.5341.1184.353.2184.353.21.41+11=12.4141.12ffX分布系数:434.0557.0126.2656.1557.0443.01443.01184.341.123SCCC0675.0123.02121123.0434.0557.012112CCC各支路转移电抗:6.28434.041.1201.28443.041.1279.2010675.041.12321fsfffXXXXXX大学电力学院课程设计设计-13--13求计算电抗:198.04.110005001.2804.510002579.20111jjsjIXX035.06.2816.28jsjsIX7.7f点路转移电抗41.1ffX分布系数同上各支路转移电抗为:25.3434.041.1183.3443.041.193.220615.041.1321fsfffXXXX求计算电抗:25.316.0100050183.357.010002593.22321jsjjjXXXXXX大学电力学院课程设计设计-14--14短路电流点编号基值电压基值电流支路名称支路计算电抗额定电流OS短路电流周期分量标么值有名值公式d-11155.02110kv系统25MW发电机25MW发电机50MW发电机小计0.550.5750.5750.255.020.1570.1570.3141.9131.821.824.39.60.290.291.3511.53d-210.554.99系统G1G2G3小计3.720.440.771.6554.991.7181.7183.4630.272.41.350.6314.854.1232.322.16523.64d-36.391.64系统G1G2G3小计22.472.644.649.6691.642.8642.8645.7280.0450.380.220.1044.121.080.630.66.43d-410.554.99系统G1G2G3小计14.621.733.016.9154.991.7181.7183.4360.0680.60.340.1453.741.030.580.535.88d-56.391.64系统G1G2G3小计38.0914.487.8516.3991.642.8642.8645.7280.0260.2230.1270.0162.380.640.360.353.73d-66.391.64系统G1G2G3小计28.66.36.31.7591.642.8642.8645.7280.0350.1590.1590.63.210.460.463.447.57d-710.554.99系统G1G2G3小计3.250.710.710.254.991.7181.7183.4360.3251.461.465.417.872.522.5218.5541.46XX大学电力学院课程设计设计-15--15短路电流点编号0.2S短路电流稳态短路电流短路冲击电流全电流有效值标么值有名值标么值有名值公式2.55∼2.721.52∼1.62d-11.6651.561.563.28.360.2450.24