发电厂电气部分课程设计

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1、发电厂一次部分课程设计发电厂电气部分课程设计题目凝汽式火电厂一次部分课程设计学院名称电气与信息工程学院指导教师李梅班级电气08—3组别第四组目录1设计任23发电厂一次部分课程设计务书····················································31.1原始资料··················································31.2设计任务·····················································31.3.设计要求·················

2、··································42电气主接线·····················································2.1系统与负荷资料分析············································52.2主接线方案的选择··············································62.3主变压器的选择与计算·········································93短路电流的计算················

3、································113.1短路计算的一般规则············································113.2短路电流的计算23发电厂一次部分课程设计················································124电气设备的选择················································174.1电气设备选择的一般规则········································174.2电气选择的条

4、件················································174.3电气设备的选择················································19结束语··························································21参考文献························································221设计任务书1.1原始资料23发电厂一次部分课程设计1．1．1发电厂建设规模（1）类型:凝汽式火电厂（2

5、）最终容量、机组的型式和参数：3*125MW、出口电压：15.75KV，发电机次暂态电抗：0.12,；额定功率因数：0.8。（3）机组年利用小时数：6000h/a；厂用电率：8%。发电机主保护动作时间0.1秒。1．1．2电力负荷水平:（1）220KV电压等级：负荷容量260MW，出线4回，无近区负荷，系统容量为无穷大，选取基准容量为100MVA归算到发电厂220KV母线短路容量为3400MVA.。（2）110KV电压等级：出线4回（10KM），无近区负荷，系统容量为500MVA。1.1．3环境条件（1）当地年最高温40℃，年平均温度20℃，（2）气象条件无其它特殊要求。

6、1.2设计任务（1）发电机和变压器的选择表1.1,汽轮发电机的规格参数型号额定电压额定容量功率因数接线方式次暂态电抗QFS-125-215.75KV125MW0.8YY0.12-发电机参数如上表，要求选择发电厂的主变，联络110KV和220KV的联络变压器的型号。（2）电气主接线选择（3）短路电流的计算：在满足工程要求前提下，为了简化计算，对短路电流进行近似计算法。结合电气设备选择选择短路电流计算点求出个电源提供的起始次暂太电流,冲击电流，及计算短路电流热效应所需不同时刻的电流。（4）主要电气设备的选择：要求选择110KV母线侧断路器，隔离开关，电流互感器。1.3设计要

7、求（1）短路电流计算及电气设备选择计算方法应正确。23发电厂一次部分课程设计（2）主接线图形符号，线条及标题栏符合规范，接线正确，图面布局合理，参数标注正确，图形清晰美观。（3）论文格式应符合要求，结构严谨，逻辑性强，层次分明，文理通顺，无错别字。2电气主接线23发电厂一次部分课程设计2.1系统与负荷资料分析根据原始资料，本电厂是中型发电厂，比较远离负荷中心。本电厂要与220KV系统相连，还要向110KV系统供电。由资料我们可知：220KV电压等级：负荷容量260MW，出线4回，无近区负荷，系统容量为无穷大，选取基准容量为100MVA归算