电力系统及其自动化毕业设计

毕业设计题目宝兴水电站电气部分设计专业电力系统及其自动化宝兴水电站电气设计主要原始数据：发电机参数：65MW×3+45MW×2,cosφ=0.85,Xd”=0.186,10.5kV,系统参数：220kV出线四回，正序阻抗（标幺值）：0.0356,110kV出线四回。第一章主接线设计1.1主接线方式的拟定方案一:方案二:方案三：方案四:至厂用方案五:至厂用方案比较：首先，通过分析原始资料，宝兴水电站属于中型水电站性的可靠性要求较高，方案一五台发电机以单元接线的方式分别接在两台主变上，但若其中一台变压器故障，则该变压器所连接的发电机也需停止工作，该方案可靠性不高，故首先排除方案一。方案二\三中五台变压器全接在110kV\10.5一条母线上，可靠性也不高，也将其排除。其次考虑经济性，方案五中10.5kV使用双母接法，没有必要，经济性太差，故最终选择方案四。1.2设备的选择1.2.1发电机的选择型号SF65-28/640SF45-56/900额定功率65MW45MW功率因数Cosφ=0.85Cosφ=0.85额定电压10.5kV10.5kV次暂态电抗0.2120.183零序电抗0.0920.0851.2.2三绕组变压器的选择型号额定容量额定电压阻抗电压高中低U1-2%U1-3%U2-3%SFPST-240000/22024000022011010.524.014.09.01.2.3双绕组变压器的选择型号额定容量额定电压额定容量高低Ud%SFP7-90000/2209000022010.512.5SFP7-63000/1106300011010.510.5第二章短路电流计算短路点短路平均电压电源名称基准电流(kA)计算电抗0’时短路电流分量(kA)及短路容量(MVA)0．1’时短路电流分量(kA)及短路容量(MVA)短路冲击电流(kA)全电流(kA)Up(kv)IjXjsI”Ifz”Sd”I”Ifz”Sd”ichICHd1220S28.09039.72511238.9128.09018.09011238.9173.59643.82G10.1910.3180.6730.952296.280.5440.318221.661.7631.050G20.1910.3180.6730.952296.280.5440.318221.661.7631.050G30.1910.3180.6730.952296.280.5440.318221.661.7631.050G40.1320.9440.2160.30586.420.2010.11580.420.5660.337G50.1320.9440.2160.30586.420.2010.11580.420.5660.337小计0.8372.84230.54143.19112300.5930.12419.27412064.7380.01747.644S4.7397.70290.4964.7393.96790.49612.7347.672G24.9051.8222.9184.12755.7222.9182.44255.7227.8414.724G34.9051.8222.9184.12755.7222.9182.44255.7227.8414.724G43.3955.4110.6250.88493.6670.6250.52393.6671.6791.012G53.3955.4110.6250.88493.6670.6250.52393.6671.6791.012小计14.9814.46611.82517.724389.27411.8259.897389.27431.77419.144G14.9050.21225.50636.071487.06319.08015.907364.35268.53541.294d410.5三相短路计算表格单相短路计算表格0’时短路电流分量(kA)及短路容量(MVA)0．1’时短路电流分量(kA)及短路容量(MVA)Up(kv)IjXjsI”Ifz”Sd”I”Ifz”Sd”ichICH220S28.0439.6511218.1128.0410.0911218.1173.4643.74G10.1910.8400.721.02288.070.690.40276.071.891.12G20.1910.8400.721.02288.070.690.40276.071.891.12G30.1910.8400.721.02288.070.690.40276.071.891.12G40.1322.1330.180.2572.020.180.1072.020.470.28G50.1322.1330.180.2572.020.180.1072.020.470.28小计0.8376.78630.5643.2112226.3630.4711.4912190.3680.0747.6610.5S4.597.9587.674.593.8487.6712.337.43G24.9054.9772.223.1442.402.221.8642.405.973.60G34.9054.9772.223.1442.402.221.8642.405.973.60G43.39512.4340.420.598.020.420.358.021.130.68G53.39512.4340.420.598.020.420.358.021.130.68小计16.634.8229.8715.41188.519.878.26188.5126.5315.99G14.9050.52722.3831.65427.4621.6318.10413.1360.2036.26短路点短路平均电压电源名称基准电流(kA)计算电抗d1d4短路冲全电流击电流(kA)(kA)两相短路计算表格0’时短路电流分量(kA)及短路容量(MVA)0．1’时短路电流分量(kA)及短路容量(MVA)Up(kv)IjXjsI”Ifz”Sd”I”Ifz”Sd”ichICHd1220S32.3845.7912955.2432.3818.5912955.2484.8550.51G10.1910.4420.731.03292.070.650.37260.071.911.14G20.1910.4420.731.03292.070.650.37260.071.911.14G30.1910.4420.731.03292.070.650.37260.071.911.14G40.1321.1390.140.2056.010.140.0856.010.370.22G50.1321.1390.140.2056.010.140.0856.010.37.022小计0.8373.60434.8549.2813943.4734.6119.8613847.4791.3254.172d410.5S5.087.1897.015.084.2597.0113.678.23G24.9052.5920.240.344.580.240.204.580.650.39G34.9052.5920.240.344.580.240.204.580.650.39G43.3956.6491.021.4419.521.020.8519.522.741.65G53.3956.6491.021.4419.521.020.8519.522.741.65小计16.618.4827.610.74145.217.66.35145.2120.4512.31G14.9050.27827.1928.45519.3321.9118.34418.4873.4144.05短路点短路平均电压电源名称基准电流(kA)计算电抗短路冲全电流击电流(kA)(kA)第三章电气设备的选择3.1断路器的选择型号额定电压（KV）额定电流（A）额定开断电流（KA）极限通过电流（KA）热稳定电流（KA）SFM220-220/315022031505010050KW11102000215521SN5-20G201200087173173SN5-20G20600087173173SN5-20G206000871731733.2隔离开关的选择型号额定电压（KV）额定电流（A）极限通过电流（KA）热稳定电流（KA）GW4-220/2000220200010040GW4-110/200011020008031．5GN10-20/12000201200014580GN10-20-800020800014580GN10-20-8000208000145803.3母线的选择截面尺寸双槽导体截面集肤效应系数导体载流量截面系数hbtr75355.5613903.172620556.51027401.08546209.510150001.563160108112525011512.53.173.4电流互感器的选择型号额定电流比（A）准确级次1s热稳定电流动稳定电流LCWB-2202×1000/50.560100LCW-1102×2000/50.51552.5LMZ1-206000~12000/50.580120LMZJ1-203000/50.574100LMZJ1-203000/50.5741003.5电压互感器的选择322031.0311031.0型号额定电压（kV）二次负荷（VA）最大容量初级绕组次级绕组辅助绕组0.1级0.5级3级JCC-2200.115050010002000JCC-1100.115050010002000JSJW-15200.10.113120200480960JSJW-15200.10.113120200480960JSJW-15200.10.131202004809603.6避雷器的选择型号系统额定电压（kv）额定电压（kv）持续运行电压（kv）雷电冲击残压（kv）陡坡冲击残压（kv）FCZ-220J220200146520582Y10W5-110/26011010073260291Y5WS5-17/50L10178.65051.8Y5WS5-17/50L10178.65051.8Y5WS5-17/50L10178.65051.8第四章厂用电接线的设计宝兴电厂装有3台65MW机组和2台45MW机组，均采用发电机-双绕组变压器单元接线，属于中型水电站。因此，厂用电采用380V一级电压。接线如附图第五章配电装置设计5.1屋外布置方案比较：普通中型配电装置：优点：布置比较清晰，不易误操作，运行可靠，施工和维修都比较方便，构架高度较低，抗震性能较好，所用钢材较少，造价较低。缺点：占地面积较大。分相中型配电装置：优点：接线简单，清晰，占地面积小。高型配电装置：优点：布置紧凑，纵向尺寸显著减少占地面积一般只有普通中型的50%，母线，绝缘子串和控制电缆的用量也比中型少。半高型配电装置：优点：占地面积约比中型减少30%，既节省用地又减少高层检修的工作量，实现进出线均带母线旁路很方便。缺点：检修不够方便。综上所述，鉴于本水电站地处四川，因此最终选择抗震性较高的普通中型配电装置。宝兴水电站电气设备布置图见附图。6.1发变组的保护配置第六章继电保护设计1.纵联差动保护2.横联差动保护3.单相接地保护4.发电机的负序电流及低压启动的过电流保护5.发电机过负荷保护6.失磁保护6.2变压器保护配置1.纵联差动保护2.低电压启动的过电流保护3.过负荷保护4.瓦斯保护5.零序电流保护6.3母线保护的配置1.完全差动保护2.断路器失灵保护总结本次毕业设计的题目是宝兴水电站电气主接线及其发电机保护设计。在对原始资料分析和短路电流计算的基础上，选择了该电站电气主接线方案，对主要电气设备进行选型；对发电机、变压器、母线保护进行设计及整定计算，较好的完成了本次设计任务。通过对宝兴水电站一次及发电机继电保护设计过程，本人对电厂的设计有了一个更全面的认识，加深了所学的电气工程专业知识，提高了分析问题、解决问题的能力，培养了独立工作能力，为今后顺利的开展工作打下良好的基础。电气一次、二次设计是电气工程专业的学生在