【作者】 李伟英；

【导师】 黎福海； 周冠东；

【作者基本信息】 湖南大学 ， 电子与通信工程， 2007， 硕士

【摘要】 主变压器冷却系统可分为油浸自冷式、油浸风冷式、强迫油循环冷却方式三种,其中最常用的强迫油循环冷却方式又分为强油循环风冷却和强油循环水冷却。现有的强油循环风冷却系统控制装置一般都采用传统的继电式控制装置,这种传统的控制装置逻辑控制功能低下、无通讯和保护功能、自动化水平低,已不能适应变电所综合自动化与变电所无人值班的要求。本文从工程应用实际要求出发,以西门子S7-200系列PLC为控制核心,配合TI公司的MSP430单片机,设计了一种稳定可靠的变压器风冷系统控制装置。该装置不但具有比传统继电式控制装置更多的智能控制功能,而且带有符合电力103规约(IEC 60870-5-103:1997)的通讯接口和远程监控平台。装置在对变压器风冷系统控制逻辑进行完善和改进的基础上,实现了冷却器电源电压和风扇电流的实时测量和故障判定,以及远程工作模式设定和告警功能。装置采用的远程监控平台由于采用了通用的103规约接口,可以集成到变电站综合自动化系统中,使监控人员的操作更方便。变压器风冷系统控制装置设计中充分考虑装置的稳定性和可靠性,从装置机箱结构设计、电源系统设计、器件选型、电路板设计以及软件结构设计等方面提高装置的抗干扰能力和恶劣气候适应能力。装置通过了严格的高低温试验和抗干扰试验,还设计了结构合理,安装维护方便的机箱,使装置成为一款能够适应电力系统恶劣运行环境、功能完善、操作界面友好的产品,并已经在电力系统中进行试运行。更多还原

【Abstract】 Main transformer cooling system may be classified into three classes: oil-impregnated automatic cooling; oil-impregnated air blast cooling; forced oil circulation cooling. One of the most commonly used is forced oil circulation cooling, which can be classified into two types: forced oil cooling with circulating water; forced oil cooling with circulating wind. The existing forced oil cooling with circulating wind system control devices are generally traditional relay-control devices. These traditional relay-control devices have low logic control function, low level of automation, no communications and no protection function. They can not satisfy the requirements of unattended or integrated automatic substation.For practical application requirements, the goal of this paper is to design a stable and reliable transformer cooling system control devices, with Siemens S7-200 Series PLC for the control of the core and the TI MSP430. The device has more intelligent control function than the traditional relay-control device, and also has communications interface and remote monitoring platform with the Statute of Power 103 (IEC 60870-5-103:1997). On the basis of refining and improving the transformer air blast cooling system control logic, this device can achieve real-time measurement of the voltage of Cooler Power and current of fans,as well as the function of remote mode seting and alarming. Installations in the remote monitoring platform use a common interface to the Statute 103, and can be integrated into the substation automation system, so that the monitoring operation is more convenient.The deisign of transformer coolant system use fan fully considerated the stability and relability of the equipment. To raise the anti-interference ability of the system, several methods were proposed, such as good machine cabinet, high precision power supply system, carefully choosen of chips used in the design, best design of circuit board and software, and so on. The system passed strict high & low temprature tests and anti-interruption tests. The system also designed a borad container, which make it easy to do installation or maintenance work. All of these make the equipment to be a product can adapt the extremely poor operation enviroment of electrical system, with perfect function and friendly Operator Interface. The deisign of transformer coolant system use fan is testing in electric power system.更多还原