关键字：水轮机主机选型；水电站机电设计；蜗壳；尾水管；厂房；水轮机调节保证计算；水电站辅助设备；油、水、气系统；电气一次。

Abstract

It is the mechanical and electrical initial design of Sanmen hydroelectric power station, including: hydraulic turbine and power generator designed, governor and speed control equipment designed, auxiliary equipment designed and electrical part designed.

In the chapter 1 of Hydraulic Turbine and Generator Designed, there is 1 kind of hydraulic turbine HL240 for selection, and there are 12 plans to be compared in this part. First, selecting better plans by comparing power output line of generator and working territories of hydraulic turbine. Second, choosing the best one by assessing investment and average efficiency of every better plan. Finally, deciding to make the third plan as the best one. In the plan, I’ll use 4 units, the runner diameter is 5.5 meter,and the speed of running is 79r/min.

In the chapter 2 of Governor and Speed Control Equipment designed, the layout of the station is a required use with an invest penstock. Therefore, it needs to calculate for a unit when it rejects whole load. In this part, straight closing time of wicket get

servomotor should be calculated in design head and maximum potential head. Then, calculateξandβ, β<55%. Finally, choosing servomotor, governor and oil-handling facility.

In the chapter 3 of Auxiliary Equipment, this part is designed for watering and drainage system, air supply system and turbine oil system designed. According to designing requirement, I’ll select the right kind of turbine oil tanks, water pumps, air receiver and compressor.

In the chapter 4 of Electrical part, first of all, it should design intake system. The voltage step of transmitted wire is 220KV, 2 lines, and the wire isLGJQ?500 . Secondly, it should design main wire. Generator side and 110KV side , load nearby side and using for station side should be included. Generator side: unit wiring, the

transformer isSSPL1?120000/220* . load nearby side: transmit and transformer unit; using for station side: single bus and wiring in sections. Thirdly, it should calculate short current, including . Finally, fixing out electrical equipment according to and . That’s all.

Key words: Hydraulic turbline Screel case Regulate and guarantee to calculate Auxiliary Electrical part.

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目录

第一章、水轮机组选型设计

第一节 水轮机型号选定 ........................................................................................................ 15

一、水轮机型式的选择：...................................................................... 15 二、转轮的形式...................................................................................... 15

第二节 水轮机主要参数的确定 ............................................................................................ 15 第三节 较优方案的选择 .......................................................................................................... 17

一、较优方案的选择.............................................................................. 17

第四节 技术经济指标计算 .................................................................................................... 19

（一）水力机械部分 …………………………………………………………...9

一、动能经济指标.................................................................................. 19 二、机电设备投资和耗钢量.................................................................. 20 （二）电气部分...................................................................................... 22

第五节 最优方案选择 ............................................................................................................ 23 第六节 最优方案的进出流水道计算 .................................................................................... 26

一、转轮的计算...................................................................................... 26 二、蜗壳计算.......................................................................................... 27 三、尾水管计算...................................................................................... 28

第七节 厂房 ............................................................................................................................ 28

一、水轮发电机外形尺寸估算.............................................................. 28 二、厂房尺寸的确定.............................................................................. 30

第二章 调节保证计算及调速设备的选择

第一节 设计水头下甩全负荷 ................................................................................................ 33

一、调节计算的标准.............................................................................. 33 二、已知计算参数.................................................................................. 33 三、压力引水系统平均流速.................................................................. 34 四、水流惯性时间常数.......................................................................... 35 五、压力上升计算.................................................................................. 35 六、转速上升计算.................................................................................. 38

第二节 最大水头下甩全负荷 ................................................................................................ 39

一、最大水头下机组流量Q .................................................................. 39 二、压力引水系统平均流速.................................................................. 40 三、确定水流惯性时间常数Tw和最短关闭时间TSH ...................... 41 四、压力上升计算.................................................................................. 41 五、转速上升计算.................................................................................. 43

第三节、调节功计算及接力器的选择 .................................................................................... 44

一、调节功计算...................................................................................... 44 二、调速器的选择.................................................................................. 45 三、油压装置的选择.............................................................................. 46

第三章 辅助设备

第一节 水系统 ........................................................................................................................ 46

一、技术供水系统.................................................................................. 46 二、消防和生活供水.............................................................................. 50 三、检修排水.......................................................................................... 51

第二节 气系统 ........................................................................................................................ 53

一、气系统用户...................................................................................... 53 二、供气方式.......................................................................................... 53 三、设备选择.......................................................................................... 54

第三节 透平油系统 ................................................................................................................ 58

一．透平油系统供油对象...................................................................... 58 二．用油量估算...................................................................................... 58

第四章 电气一次部分

第一节 接入系统设计 ............................................................................ 错误！未定义书签。

一、接入系统分析.................................................. 错误！未定义书签。 二、估算送电容量.................................................. 错误！未定义书签。 三、确定可行方案.................................................. 错误！未定义书签。 四、选择送电线路的截面...................................... 错误！未定义书签。

第二节 电气主接线设计 ........................................................................ 错误！未定义书签。

一、发电机侧.......................................................... 错误！未定义书签。 二、送电电压侧...................................................... 错误！未定义书签。 三、近区负荷侧...................................................... 错误！未定义书签。 五、电厂自用电侧.................................................. 错误！未定义书签。

第三节 短路电流计算 ............................................................................ 错误！未定义书签。

一、电力系统接线图.............................................. 错误！未定义书签。

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