47到65米水头200MW水电站机电设计毕业设计

毕业设计计算书

47到65米水头200MW水电站机电设计

秀湾水电站47m ～65m 水头200MW 装机容量机电初步设计

学号： 06022213

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摘 要

此次设计是秀湾水电站的机电设备初步设计，设计内容共分为四个大章,包括：水轮机组主机选型，调节保证计算及调速设备选择，辅助设备系统设计，电气一次部分设计。共分为四个大章。

第一章水轮机组的选型设计中根据水头选中HL260/D74，经过选型有10个待选方案。根据水轮机在模型综合特性曲线上的工作范围，并结合由试算法划出发电机出力限制线，初步选出较优方案，再根据技术经济性及平均效率的比较在较优方案中选出最优方案。最终选择第Ⅲ方案为最优方案，4台HL260/D74机组，转轮直径3.30m ，机组转速166.7rpm 。

第二章调节保证计算及调速设备的选择中由于本电站布置形式为单机单管，所以只对一台机组甩全负荷情况进行计算。调节保证计算及调速设备选择中分别在设计水头和最高水头下选取导叶接力器直线关闭时间，计算相应的ξ和β，使β<55%，并选取接力器、调速器和油压装置的尺寸和型号。

第三章 辅助设备设计中分别对油、水、气三大辅助系统设计，按照要求设计各系统的工作方式并按照各计算参数选出油罐、水泵及储气罐和空压机等设备。

第四章 电气一次部分设计中，按照设计要求，先对接入系统进行设计计算，本设计中送电线路电压等级220KV ，2回线路，送电导线型号LGJQ-400；接着进行主接线设计，对发电机电压侧，送电电压侧，近区负荷侧及电站自用电侧四部分考虑。发电机电压侧选用扩大单元接线，选取主变型号为SFPL-120000，送电电压侧选用变压器—母线接线，近区负荷送电线路电压等级35KV ，选用2回线路，送电导线型号LGJ-50，变压器选择SL7-6300/35型2台，自用电负荷侧采用单母线分段接线；然后进行短路计算，按设计要求，取发电机出口侧、主变高压侧、近区供电高

压侧和自用电低压侧进行短路计算，分别求出‘

‘、、、S i I I ch "的有名值；最后，按

照额定电压和电流选取电气设备进行校验，至此，本设计完成。

热能与动力工程专业毕业设计

设计者：朱宏

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Abstract

What I do is the mechanical and electrical main design of XiuWan hydroelectric power station, including 4 important part: 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 kinds of hydraulic turbine HL260/D74 for selection on the basic of the height of the hydroelectric power station. There are 10 plans to be compared in this part after the compute. 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 second plan as the best one. In the plan, I ’ll use 4 units, the runner diameter is 3.30 meter,and the speed of running is 166.7rpm.

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, calculate ξ and β, 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 is LGJQ-400. Secondly, it should design main wire. Generator side and 220KV side , load nearby side and using for station side should be included. Generator side: one line wiring, the transformer is SFPL-120000; 35KV side: The unit extension form; load nearby side: transmit and transformer unit, the transformer is SL7-6300/35; using for power station side: Transformer —line wiring form. Thirdly, it should calculate short current,

including ‘

‘、、、S i I I ch ". Finally, fixing out electrical equipment according to e U

and

e I . That ’s all.