Design On Intelligent Controlling Device Of Main Transformer Wind Cooling System

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.