4×50MW水电厂电气部分初步设计.doc

4×50MW水电厂电气部分初步设计 （200级电气工程及其自动化专业）摘 要： 发电厂是电力系统的中心环节，水电厂是利用河流的水能，推动水轮机，带动发电机发电的工厂。本设计是×50MW水电厂电气部分初步设计，将台MW的发电机，经过升压后并入110的电网之中。设计的重点在电气主接线的选择，变压器的选择，相关短路电流的计算，对各个电气设备的正确选择，屋外配电装置的设计，系统继电保护的配置，防雷与接地。通过本次设计，综合地考察学生对整个专业知识的掌握水平和程度，同时可以使学生对水电的电气设计相关知识进一步加深，了解水电厂设计的初步流程，为今后的工作理论和再作一次系统的学习和掌握。关键词：水电厂 短路电流计算电气设备 继电保护 The Preliminary Design of the Electric Elements of×50MW Hydro-plant XuZhun DaiJiaLin MoChunZhang YeDeSheng GanChao Tutor:ShaQuanHui (Electrical Engineering and its Automation Major of 2007’s) Abstract: The key process of the electricity system is the power plant. Hydro-plant is a factory in which the power generator produces power by the use of the hydro-energy of the river to drive the water turbine. This engineering design, a preliminary design of the electric elements of 4×50MW hydro-plant, puts four50MW power generators into the 110kV power grid after being boosted. The key point of the design is the selection of the main connection wire of the electric and the transformer, the calculation of the short circuit, the correct selection of each electric device, as well as the deployment of the relay protection of the system and The recondition of the relay protection of the system .This design will comprehensively investigate that how much professional knowledge the students have learned and how well they have mastered. Meanwhile, it will make the students know much about the relevant knowledge on electric design of the hydro-plant, and know the basic process of the hydro-plant design. Finally, we can form a set of hydro-plant preliminary design achievements for a 110kV electric system, so that we can systematically learn and master theories and the work skills for the future. Key words: Hydro-electric plants Short-circuit calculateb Electrical-equipment Protective Relaying 1 资料分析 1.1原始资料 1.1.1发电厂类型待建电厂类型为引水式水电厂。 发电机台数和容量×50MW，，，，。 电力负荷 （1）厂用电率% 。 （2）发电机电压负荷无。 （3）升高电压母线上负荷110kV电压级，，以2回供电线路将功率送入系统。 本厂接入电力系统示意图 图1 电力系统示意图 系统：Xc=