【正文】 njin University and the Nanjing electric power automation plant cooperation development microputer phase voltage pensated the type direction high frequency protection, the Xian Jiao tong University and the Xuchang Relay Factory cooperation development positive sequence breakdown ponent direction high frequency protection also one after another in 1993, in 1996 through the appraisal. Here, the different principle, the different type microputer line and the host equipment protect unique, provided one batch of new generation of performance for the electrical power system fine, the function has been plete, the work reliable relay protection installment. Along with the microputer protective device research, in microputer aspect and so on protection software, algorithm has also yielded the very many theories result. May say started our country relay protection technology from the 9039。s to enter the time which the microputer protected. 2 relay protections future development The relay protection technology future the tendency will be to puterizes, worked, the intellectualization, will protect, the control, the survey and the data munication integration development. puterizes Along with the puter hardware swift and violent development, the microputer protection hardware also unceasingly is developing. The original 外文翻譯（原文） 5 North China electric power institute develops the microputer line protection hardware has experienced 3 development phases: Is published from 8 lists CPU structure microputer protection, does not develop to 5 years time to the multi CPU structure, latter developed to the main line does not leave the module the big modular structure, the performance enhances greatly, obtained the widespread application. Huazhong University of Science and Technology develops the microputer protection also is from 8 CPU, develops to take the labor controlling machine core partially as the foundation 32 microputers protection. The Nanjing electric power automation research institute from the very beginning has developed 16 CPU is the foundation microputer line protection, obtained the big area promotion, at present also is studying 32 protections hardware system. Southeast the university develops the microputer host equipment protects the hardware also passed through improved and the enhancement many times. The Tianjin University from the very beginning is the development take more than 16 CPU as the foundation microputer line protection, in 1988 namely started to study take 32 digital signals processor (DSP) as the foundation protection, the control, the survey integration microputer installment, at present cooperated with the Zhuhai automatic equipment pany develops one kind of function plete 32 big modules, a module was a miniputer. Uses 32 microputers chips only to focus by no means on the precision, because of the precision the a/d switch resolution limit, is surpassed time 16 all is accepts with difficulty in the conversion rate and the cost aspect。 32 microputers chips have the very high integration rate more importantly, very high operating frequency and putation speed, very big addressing space, rich mand system and many inputs outlet. The CPU register, the data bus, the address bus all are 32, has the memory management function, the memory protection function and the duty transformation function, and (cache) and the floating number part all integrates the high speed buffer in CPU. The electrical power system the request which protects to the microputer enhances unceasingly, besides protection basic function, but also should have the 外文翻譯（原文） 6 large capacity breakdown information and the data longterm storage space, the fast data processing function, the formidable traffic capacity, with other protections, the control device and dispatches the working by to share the entire system data, the information and the work resources ability, the higher order language programming and so on. This requests the microputer protective device to have is equal to a pc machine function. In the puter protection development initial period, once conceived has made the relay protection installment with a miniputer. At that time because the small machine volume big, the cost high, the reliability was bad, this tentative plan was not realistic. Now, with the microputer protective device size similar labor controlling machine function, the speed, the storage capacity greatly has surpassed the same year small machine, therefore, made the relay protection with plete set labor controlling machine the opportunity already to be mature, this will be one of development directions which the microputer protected. The Tianjin University has developed the relay protection installment which Cheng Yong tong microputer protective device structure quite same not less than one kind of labor controlling machine performs to change artificially bees. This kind of equipment merit includes: has the 486pc machine plete function, can satisfy each kind of function request which will protect to current and the future microputer. size and structure and present microputer protective device similar, the craft excellent, quakeproof, guards against has been hot, guards against electromagic interference ability, may move in the very severe working c