The Study Of New 110KV Digital Line Protective Device

The rapid development of the power industry and the scientific and technological advances related digital protective relay devices brought digital research presented unprecedented opportunities and challenges. Digital continuous optimization of the structure of protective devices, functional enhancement, more flexible application to for the demands of the development of the electricity system. The many world-renowned automation supplier constant innovation, research and development of many high-performance digital protective devices. Domestic figures began developing protective devices in the 1980s, many colleges and universities, scientific research institutes, manufacturers and power systems operation sector in learning foreign advanced technology, jointly developed China's own figures protection devices, and successfully applied to the electricity system. Digital automation system relay and transformer stations to promote the new line of digital protective device development and performance offered many new problems and higher demands. All figures in the domestic and international relay on the successful experience of development based on new technologies with protective figures, analysis and development of new digital protective devices,1. On the basis of simple design and universal construct, the device adopts new chip FPGA processor to realize the sampling process of changing sampling rate and DSP algorithmic when the signal pretreatment is designed in order to enhance the accuracy of the signal. To analog signal, the 96-point changing sampling pretreatment is used then the 12-point sampling is used, but the signal keeps the characteristic of 96 points, and reached MCU precisely, reduced the MCU handling pressure of multi-point sampling.2. The processors selected the new micro controller (MC9S12DT256B ) of MOTOROLA company. The scheme of combination design not only can greatly enhance the performance of the devices, but also advances new ideas for future research of devices.3. The dissertation analyses the deficiencies of the traditional opening into and opening up, raises and applies the new devices and new principles, and adopts special chip to realize the function of opening into and opening up. More simple and reliable opening into and opening up circuit is designed.4. The dissertation uses rolling mouse instead of the traditional key-press, so the operation is more convenient, the information can be transmitted by USB which may be hot-inserted and hot-drew so as to save printers in transferring reports.5. In the dissertation, the protecting and measuring arithmetic are discussed, and some arithmetic is detailed deducted. From includes in the weaken direct component fault current to withdraw the fundamental wavecomponent to carry on the protection judgment, both can guarantee the protection computation to precision, and can guarantee the protection movement to rapidity, thus enhanced the protection movement accuracy and the reliability.6. The micro controller realizes the high language programming, simplifies software development and maintenance, and realizes modular design of software in the installation and dynamic casting and quitting in the execution of program, so the function of the device is more flexible and currency.7. The dissertation detailed explains the anti-jamming measure, the experience validates the validity and reliability of designed computer protect hardware, algorithms and software.