1、 某水电厂电气主接线设计某水电厂电气主接线设计 摘摘 要要:电站是电力系统的重要组成部分,它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。电气主 接线是发电厂变电所的主要环节,电气主接线的拟定直接关系着全厂(所)电气 设备的选择、配电装置的布置、继电保护和自动装置的确定,是变电站电气部分 投资大小的决定性因素。 本次任务是电站的电气设计,首先,根据主接线的经济可靠、运行灵活的要 求选择各个电压等级的接线方式,在技术方面和经济方面进行比较,选取灵活的 最优接线方式。 其次进行短路电流计算,根据各短路点计算出各点短路稳态电流和短路冲击 电流,从三相
2、短路计算中得到当短路发生在各电压等级的工作母线时,其短路稳 态电流和冲击电流的值。 最后,根据各电压等级的额定电压和最大持续工作电流进行设备选择,然后 进行校验。 关键词:关键词:电气主接线;变压器选择;短路计算;设备选择。 Abstract: The power plant is the electrical power system important constituent,it directly affects the entire electrical power system the securityand the economical movement, is relates t
3、he power plant and usersmiddle link, is playing the transformation and the assignmentelectrical energy role. The electrical host wiring is the power planttransformer substation key link, the electrical host wiring draws updirectly is relating the entire factory the electrical equipment choice, the p
4、ower distribution equipment arrangement, andthe automatic device determination, is the transformer substationelectricity partial investments size determining factor. This duty is the power plant electrical design, first, is reliableaccording to the host wiring economy, the movement nimble requestchooses each voltage rank the wiring way, carries on the comparison inthe technical aspect and the economical aspect, selects the nimblemost superior wiring way. Next carries on the