【正文】 rs and technicians creatively absorption, the digestion, have grasped the overseas advanced relay protection equipment performance and the movement technology , pleted to have the deep relay protection theory attainments and the rich movement experience relay protection technical team, and grew the instruction function to the national relay protection technical team39。s to the 8039。s still were in the dominant position, this was the integrated circuit protection time. The integrated electricity road work frequency conversion quantity direction develops which in this aspect Nanjing electric power automation research institute high frequency protected the vital role , the Tianjin University and the Nanjing electric power automation plant cooperation development integrated circuit phase voltage pensated the type direction high frequency protection also moves in multi strip 220kv and on the 500kv line. Our country namely started the puter relay protection research from the end of the 7039。 32 microcomputers 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 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 Yongtong 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 electronmagetic interference ability, may move in the very severe working conditions, the cost may accept. uses the std main line or the pc main line, the hardware modulation, may select the different module wilfully regarding the different protection, the disposition nimble, is easy to expand. Relay protection installment , puterizes is the irreversible development tendency. How but to satisfies the electrical power system request well, how further enhances the relay p 8 rotection the reliability, how obtains the bigger economic efficiency and the social efficiency, still must conduct specifically the thorough research. worked The puter work has bee the information age as the information and the data munication tool the technical prop, caused the human production and the social life appearance has had the radical change. It profoundly is affecting each industry domain, also has provided the powerful means of munication for each industry domain. So far, besides the differential motion protection and the vertical association protection, all relay protections installment all only can respond the protection installment place electricity spirit. The relay protection function also only is restricted in the excision breakdown part, reduces the accident to affect the scope. This mainly is because lacks the powerful data munication method. Overseas already had proposed the system protection concept, this in mainly referred to the safe automatic device at that time. Because the relay protection function not only is restricted in the excision breakdown part and the limit accident affects the scope (this is most important task), but also must guarantee the entire system the security stable movement. This requests each protection unit all to be able to share the entire system the movement and the breakdown information data, each protection unit and the superposition brake gear in analyze these information and in the data foundation the synchronized action, guarantees the system the security stable movement. Obviously, realizes this kind of