【正文】 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。s function. Huazhong University of Science and Technology, southeast the university, the North China electric power institute, the Xian Jiaotong University, the Tianjin University, Shanghai Jiaotong University, the Chongqing University and the Nanjing electric power automation research institute one after another has all developed the different principle, the different pattern microcomputer protective device. In 1984 the original North China electric power institute developed the transmission line microputer protective device first through the appraisal, and in the system the find application, had opened in our country relay protection history the new page, protected the promotion for the microputer to pave the way. In the host equipment protection aspect, the generator which southeast the university and Huazhong University of Science and Technology develops loses magism protection, the generator protection and the generator?Bank of transformers protection also one after another in 1989, in 1994 through appraisal, investment movement. The Nanjing electric power automation research institute develops microputer line protective device also in 1991 through appraisal. The Tianjin University and the Nanjing electric power automation plant cooperation development microputer phase voltage pensated the type direction high frequency protection, the Xian Jiaotong University and the Xu Chang relay factory cooperation development positive sequence breakdown ponent direction high frequency protection also one after another in 1993, in 1996 through the appraisal. Heres, 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。 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 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 eqXX 大學(xué)電信 學(xué)院畢業(yè)設(shè)計 (論文 ) 4 uipment 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 protection the reliability, how obtains the bigger economic efficiency and the social efficiency, s