The controlling devices of main transformer wind cooling system generally used traditional relay-control device which is provided with Logic Control dysfunction, no communication and protection, and has low level of automation, has unable to meet with the requirements of integrated substation automation and unmanned substation. Intelligent controlling device of main transformer wind cooling system is the view of this development and application needs.Considering the intelligent controlling device of main transformer wind cooling system is from the practical application of engineering, the use of advanced DSP technology and CPLD, to achieve automatic control of a cooling device, the two-way cooler installations and cooler fan group in the devices are controlled separately through the independent electric double-systems, which bring into full play advantages of rapid, high-precision computing of DSP, and flexible development, simple structure, stability and reliability of CPLD. DSP not only bears much more intelligent control function than traditional relay-control device, but also realizes real-time measurement and fan motor protection for cooler supply voltage and current fans, complying with the statute of electricity 103( IEC 60870-5-103:1997 ) communication interface and remote monitoring platform. It will actualize multiple control, protection and communications functions, and ensure anti-jamming devices and adaptation to adverse whether.This thesis beginning with the basic principle of transformer cooling system, introduced cooling device overall design, and presented system function and network-structure encircling dual-mode system control and hardware framework. The third chapter recommended mechanism structure design and mastering, power, out board, CPU circuit board design and anti-interference measures on the hardware design, and focused on CPU board quasi-synchronous sampling circuit, in/out circuit design and CPLD logic circuit design. The fourth chapter talked about software on DSP's real-time operating system migration, voltage/current collection and calculation, the fan motor protection algorithm, cooler control logic and PC program design, and the statute of communications design. The fifth focused on device testing methods and conclusions, and summed up the experience in the design. At the end of the article is the conclusion and prospects.Cooling device got rigorous electromagnetic compatibility tests and high and low temperature tests, come to effective solution to stable operation in harsh environment. This device is provided with reliable operation, a high degree of automation and perfect functions, which have great significance to the improvement of integrated substation automation and the promotion of unmanned substation work. |