【作者】 吴昊；

【导师】 段清明；

【作者基本信息】 吉林大学 ， 电气工程（专业学位）， 2020， 硕士

【摘要】 变压器在运行过程中会消耗过多的热量,导致温度大幅上升,影响变压器的作业特性,降低变压器性能,甚至严重损坏变压器而发生安全事故。于是,检查变压器温度情况,适当使用降温方法,可显著提升变压器运行安全性,避免出现事故。本文以东海岛500KV变电站的变压器的冷却控制系统为研究改造对象,对于500k V电力变压器风冷装置的配置情况为两组,每组风冷装置所包括的风机组为四台,根据变压器负荷电流、绕组温度以及油温的情况对两组风机进行动态控制。控制系统以STM32f103为核心,结合相应的检测处理电路对负荷电流、风机电流、绕组温度以及风机缺相情况的检测和显示,并根据检测情况对两组风机进行动态控制,实现变电站温度的高可靠控制,将相应的状态信息通过RS-485总线发送到中控室,通过上位软件进行监控。同时,本系统设置为两种模式,分别为自动模式与手动模式。基于STM32设计系统硬件电路,该硬件有数据采集回路、单片机最小系统、LCD显示电路、继电器驱动回路、通信电路等。在软件方面,选取的开发环境为keil,使用C语言设计系统应用程序,按照系统功能设计了包括主程序、LCD显示、电流采集、温度采集以及四种工况下的自动控制等多个子程序进行了分析设计。最后,进行仿真和实物的功能测试,结果显示符合最初设计理念,表明系统可以正常运行。该冷却控制系统的设计对能大幅度改善东海岛500KV变电站的自动化程度,提高系统的可靠性,降低系统的成本,具有重要的应用价值。更多还原

【Abstract】 In the process of operation,the transformer will consume too much heat,resulting in a significant rise in temperature,affecting the operating characteristics of the transformer,reducing its performance,and even seriously damaging the transformer and causing safety accidents.Therefore,check the transformer temperature,and use the cooling method properly,can significantly improve the transformer operation safety,to avoid accidents.In this paper,the transformer cooling control system of 500 KV transformer substation in Donghai Island is taken as the research and reform object.For the configuration of 500 KV power transformer air cooling unit,there are two sets,each set of air cooling unit includes four sets,and the two sets of fans are dynamically controlled according to the transformer load current,winding temperature and oil temperature.STM32f103 as the core control system,combined with the corresponding detection circuit for the load current,current,winding temperature fan and fan of lack of phase detection and display,and according to the inspection situation to dynamic control of two groups of fans,realize high reliable control temperature of transformer substation,the corresponding state information is,to send through the RS-485 bus to the central upper monitor software.At the same time,the system is set to two modes,automatic mode and manual mode respectively.The hardware circuit of the system is designed based on STM32,including data acquisition circuit,microcontroller minimum system,LCD display circuit,relay drive circuit,communication circuit,etc.In terms of software,ke IL was selected as the development environment and C language was used to design system applications.According to the system functions,several sub-programs including main program,LCD display,current acquisition,temperature acquisition and automatic control under four working conditions were designed for analysis and design.Finally,the simulation and physical functional test results show that the system is in line with the original design concept,indicating that the system can operate normally.The design of the cooling control system is of great application value to greatly improve the automation degree of donghai 500 KV substation,improve the reliability of the system,and reduce the cost of the system.更多还原