【文章內容簡介】 ctrical 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, 5 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 protection the reliability, how obtains the bigger economic efficiency and the social efficiency, still must conduct specifically the thorough research. , control, survey, data munication integrations In realization relay protection puterizing with under the condition, the protective device is in fact a high performance, the multipurpose puter, is in an entire electrical power system puter work intelligent terminal. It may gain the electrical power system movement and breakdown any information and the data from the , also may protect the part which obtains it any information and the data transfer for the work control center or no matter what a terminal. Therefore, each microputer protective device not only may plete the relay protection function, moreover in does not have in the breakdown normal operation situation also to be possible to plete the survey, the control, the data communication function, that is realization protection, control, survey, data munication integration. At present, in order to survey, the protection and the control need, outdoor transformer substation all equipment, like the transformer, the line and so on the secondary voltage, the electric current all must use the control cable to direct to . Lays the massive control cable not only must massively invest, moreover makes the secondary circuit to be extremely plex. But if the above protection, the control, the survey, the data munication integration puter installation, will install in outdoor transformer substation by the protection device nearby, by the protection device voltage, the amperage is changed into after this installment internal circulation the digital quantity, will deliver through the computer work, then might avoid the massive control cable. If takes the work 6 with the optical fiber the transmission medium, but also may avoid the electronmagetic interference. Now the photoelectric current mutual inductor (ota) and the photovoltage mutual inductor (otv) in the research trial stage, future inevitably obtained the application in the electrical power system. In uses ota and in the otv situation, the protective device should place is apart from ota and the