外文翻译----继电保护发展现状-plc设计(编辑修改稿)

外文翻译----继电保护发展现状-plc设计(编辑修改稿)内容摘要：

onditions, the cost may accept. Uses the STD main line or the pc main line, the hardware modulation, may select the different module willfully regarding the different protection, the disposition nimble, and 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. 外文翻译（原文） 7 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 this information and in the data foundation the synchronized action, guarantees the system the security stable movement. Obviously, realizes this kind of system protection basic condition is joins the entire system each main equipment protective device with the puter work, that is realization microputer protective device worked. This under the current engineering factor is pletely possible. Regarding the general non system protection, the realization protective device puter working also has the very big advantage. The relay protection equipment can obtain system failure information more, then to the breakdown nature, the breakdown position judgment and the breakdown distance examination is more accurate. Passed through the very long time to the autoadapted protection principle research, also has yielded the certain result, but must realize truly protects to the system movement way and the malfunction autoadapted, must obtain the more 外文翻译（原文） 8 systems movement and the breakdown information, only then realization protection puter worked, can achieve this point. Regarding certain protective device realization puter working also can enhance the protection the reliability. The Tianjin University in 1993 proposed in view of the future Three Gorges hydroelectric power station 500kv ultrahigh voltage multireturn routes generatrix one kind of distributional generatrix protection principle, developed successfully this kind of equipment initially. Its principle is disperses the traditional central generatrix protection certain (with to protect generatrix to return way to be same) the generatrix protection unit, the dispersible attire is located in on various return routes protection screen, each protection unit joins with the puter work, each protection unit only inputs this return route the amperage, after transforms it the digital quantity, transmits through the puter work for other all return routes protection unit, each protection unit acts according to this return route the amperage and other all return routes amperage which obtains from the puter work, carries on the generatrix differential motion protection the putation, if the puted result proof is the generatrix interior breakdown then only jumps the book size return route circuit breaker, Breakdown generatrix isolation. When generatrix area breakdown, each protection unit all calculates for exterior breakdown does not act. This kind the distributional generatrix protection principle which realizes with the puter work has the high reliability pared to the traditional central generatrix protection principle. Because if a protection unit receives the disturbance or the miscalculation when moves by mistake, only can wrongly jump the book size return route, cannot create causes the generatrix entire the malignant accident which excises, this regarding looks like the Three Gorges power plant to have the ultrahigh voltage generatrix the system key position to be extremely important. By above may know, microputer protective device may enhance the protection performance and the reliability greatly, this is the microputer protection development inevitable trend. 外文翻译（原文） 9 protections, 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 intellig。