变电所弱电选线控制电路设计+文献综述.docVIP

变电所弱电选线控制电路设计+文献综述 摘要本课题要求设计变电所弱电选线控制电路。弱电化就是在控制、信号和测量设备中以低电压、弱电流来代替原来一般的强电式电压和电流。选线控制，就是通过切换一个控制开关有选择地操作若干个被控对象或对若干个被控对象进行分组操作。在二次回路部分分别设计了断路器弱电选线控制电路、弱电中央信号系统和断路器位置信号回路。在断路器弱电选线控制电路部分，详细介绍了自动复归、误选复归、对象选择和对象闭锁等功能。弱电中央信号系统包括事故信号回路、预告信号回路和闪光信号回路，并且具备亮屏和暗屏的操作功能。在弱电中央信号系统中对各回路的工作原理以及作用进行了详细的介绍。10860 关键词弱电选线 中央信号系统 事故信号 预告信号 闪光信号 亮暗屏 毕业设计说明书（论文）外文摘要 TitleThe circuit Design For Select Control Of WeakCurrents In Substations Abstract This subject is required to design the circuit design for select control of weak currents in substation .In control, signaling and measuring equipment, to weaken the current is to replace the generally-adopted high voltage and strong current by low voltage and weak current. By controlling a switch, select control manages to either selectively operate a number of objects or group and operate the objects. In the secondary circuit section , it includes weak line selection control circuit of the breaker , weak line central signal system , breaker position signal circuit . In the section of weak line selection control circuit of the breaker , it introduced the functions of automatic reset , mistakenly selected reversion , object selection and object locking in detail . In the weak line central signal system , it contains incident signal circuit , warning signal circuit and flash signal circuit , and it has the operating functions of bright screen and dark screen . In the section of weak line selection control circuit of the breaker , it introduced the functions of automatic reset , mistakenly selected reversion , object selection and object locking in detail . It describes working principle and effect of every circuit . 7.1 模块实现断路器弱电选线控制电路30 7.2 模块实现弱电中央信号系统35 结论43 致谢44 参 考 文 献45 1.前言 1.1 课题背景及意义 变电站是电力系统的一个非常重要的环节，是电力网的重要组成部分，它的任务是汇集电源、升降电压、分配电能，其监视性能和投资与电力系统的安全运行和投资效益密不可分[1]。 发电厂和变电站的控制、信号和测量系统不仅可以采用强电方式，也可以采用弱电方式。随着弱电技术的发展以及微型计算机的应用，控制、信号和测量系统逐步实现了弱电化和自动化。弱电化就是在控制回路、信号回路和测量回路内以低电压和弱电流来代替原来的110V~220V的操作电压和强电流。弱电化使二次回路设备绝缘要求降低，体积缩小，采用弱电选线