35kv变电站设计—毕业论文.doc

本科毕业设计(论文)
2011 年月
摘要
变电站作为电力系统中的重要组成部分,直接影响整个电力系统的安全与经济运行。是联系发电厂和用户的中间环节,起着变换和分配电能的作用。本设计根据某地方的电力负荷资料,作出了该区地面35kV变电站的一次初步设计。设计说明书内容包括负荷计算、主变压器选择与主接线的设计、高压电器的选择、无功补偿、变电站的防雷、继电保护等。本设计以实际负荷为依据,以变电站的最佳运行为基础,按照有关规定和规范,完成了满足该区供电要求的35kV变电站一次初步设计。
设计中先对负荷进行了统计,选出了所需的主变型号,然后根据负荷性质及对供电可靠性要求拟定主接线设计,考虑到短路对系统的严重影响,设计中进行了短路电流计算,在设计中还对主要高压电器设备进行了选择与计算,如断路器、隔离开关、电压互感器、电流互感器等。此外还进行了防雷保护的设计,提高了整个变电站的安全。
关键词:35kv,负荷,变电站,设计
ABSTRACT
Power system substation as an important part of the entire power system directly affects the safety and economic operation. Is the contact between power plants and the user's part, play a role in transformation and distribution of electric energy. The design load of a place based on the information the district has made a preliminary ground-35kV substation design. Design specifications include load calculation, the main transformer selection and design of the main terminal, the choice of high-voltage electrical appliances, reactive pensation, the substation lightning protection, protection and so on. The design is based on the actual load to the substation based on the best run in accordance with relevant regulations and norms, pleted to meet the power requirements of the 35kV substation area a preliminary design.
Design load of the first on the statistics, select the required transformer model, and then load the nature and reliability requirements of the development of the main power supply wiring design, taking into account the serious impact on the system short-circuit, the design for a short-circuit current Calculated also in the design were the main high-voltage electrical equipment selection and calculation, such as circuit breakers, isolating switches, voltage transformers, current transformers and so on. In addition to the lightning protection design, to improve the security of the entire substation.
Keywords:35kv,load,transformer substation,design
目录
第一章绪论 1
原始资料分析 1
变电站的建设规模 1
电力系统与本站的连接情况 1
电力负荷水平 1