外文资料与中文翻译外文资料：Relay protection present situation anddevelopment一、 Relay protection development present situationElectrical power systems swift development to the relay protection proposed unceasingly the new request, the electronic technology, the computer technology and communications swift development unceasingly has infused the new vigor for the relay protection technologys development, therefore, the relay protection technology is advantageous, has completed the development 4 historical stage in 40 remaining years of time.After the founding of the nation, our country relay protectiondiscipline, the relay protection design, the relay factory industryand the relay protection technical team grows out of nothing, has passed through the path which in about 10 year the advanced countries half century pass through. In the 50s, our country engineers and technicians creatively absorption, the digestion, have grasped the overseas advanced relay protection equipment performance and the movement technology 1, completed one to have the deep relay protection theory attainments and the rich service experiences relay protection technical team, and grew the instruction function to the national relay protection technical teams establishment. The Acheng relay factory introduction has digested at that time the overseas advanced relay technique of manufacture, has established our country own relay manufacturing industry. Therefore our country has completed the relay protection research, the design, the manufacture, the movement and the teaching complete system in the 60s. This is the mechanical and electrical -like relay protection prosperous time, was our country relay protection technology development has laid the solid foundation.From the late 50s, the transistor relay protection was starting to study. In the 60s to the 80s in is the time which the transistor relay protection vigorous development and widely uses. And the Tianjin University and the Nanjing Electric power Automation Plant cooperation researchs 500kv transistor direction high frequency protection develops with the Nanjing Electric power Automation Research institute the transistor high frequency block system is away from the protection, moves on the Gezhou Dam 500 kv lines 2, finished the 500kv line protection to depend upon completely from the overseas import time.From the 70s, started based on the integrationoperationalamplifiers integrated circuit protection to study. Has formed the complete series to the late 80s integrated circuitprotection,substitutes for the transistor protection gradually. The development which, the production, the application protected to the early 90s integrated circuit were still in the dominant position, this was the integrated circuit protection time. The integrated circuit power frequency change quantity direction which develops in this aspectNanjing Electric power Automation Research institute high frequency protected the influential role 3, the Tianjin University and the Nanjing Electric power Automation Plant cooperation developments integrated circuit phase voltage compensation type direction high frequency protection also moved in many 220kv and on the 500kv line.Our country namely started the computer relay protection research from the late 70s 4, the institutions of higher learning and the scientific research courtyard institute forerunners function. Huazhong University of Science and Technology, the Southeast University, the North China electric power institute, Xian Jiaotong University, the Tianjin University, Shanghai Jiaotong University, the Chongqing University and the Nanjing Electric power Automation Research institute one after another has developed the different principle, the different pattern microcomputer protective device. in 1984 the original NorthChina electric power institutedeveloped thetransmission line microcomputer protective device first through the appraisal, and obtained the application in the system 5, has opened in our country relay protection history the new page, protected the promotion for the microcomputer to pave the way. In the main equipment protection aspect, the generator which the Southeast University and Huazhong University of Science and Technology develops loses magnetism 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 microcomputer line protective device also in 1991 through appraisal. Tianjin University and Nanjing Electric power Automation Plant cooperation development microcomputer phase voltage compensation type direction high frequency protection, Xian Jiaotong University and Xuchang relay factory cooperation development positive sequence breakdown component direction high frequency protection also one after another in 1993, in 1996 through