发电厂及电力系统毕业设计-220kv降压变电所电气部分初步设计_精品.doc

发电厂及电力系统毕业设计-220kV降压变电所电气部分初步设计 中 文 摘 要 电是能量的一种表现形式电力已成为工农业生产不可缺少的动力并广泛应用到一切生产部门和日常生活方面电能有许多优点首先它可简便地转变成另一种形式的能量例如工厂中的电动机就是将电能转换成机械能拖动各种机械又如我们常用的电灯是将电能转变为光能满足照明需要其次电能经过高压输电线路还可输送很长的距离供给远方用电另外许多生产部门用电进行控制容易实现自动化提高产品质量和经济效益因此可见电力工业在国民经济中占有十分重要的地位而且电力必须先行才能满足工农业发展的需要 我国的电力工业发展也很快自70年代初第一台300MW机组数投运至1988年底投产600MW机组以来电力工业发展又上了一个新台阶在建的发电厂容量已达2700MW330～500kV输变电系统正在逐步扩大到1991年底全国装机总容量已超过150000MW年发电量已达677494亿kwh 电力系统是国民经济的重要能源部门而变电所的设计是电力工业建设中必不可少的一个项目熟悉各种设计规程和设计原理设计过程中要针对变电所的规模和形式具体问题具体分析Abstract Electric energy is a form of expression the power of industrial and agricultural production has become an indispensable driving force and widely applied to all aspects of daily life and production departments Energy has many advantages First it can be easily converted into another form of energy For example factories in the motor is the electric energy into mechanical energy conversion drag machinery Also we used the Electric Company is the power to change solar energy to meet the lighting needs Second a high-voltage power transmission lines but also conveying a very long distance the distance of electricity supply In addition many production sectors of electricity to control easy to automate and improve product quality and economic efficiency So that the power industry in the national economy as a very important position and power must be in order to meet the needs of industrial and agricultural development Chinas power industry development soon since the early 1970s the first 300 MW unit for a few shipped to the end of 1988 the 600 MW unit has been put into operation electricity and industrial development on a new level Capacity building of power plants has reached 2700 MW 330 500kv power transmission system is being gradually expanded To the end of 1991 the total installed capacity of over 150000 MW the generation capacity has reached 677494 billion kwh Power system is an important energy sector in the national economy and the electricity substati