| With the implement of major construction projects such as large-scale water-power engineering, urban-rural network reconstruction, and west-to-east power transmission, the power industry has developed rapidly. The development of power industry provides opportunity for the high-voltage switch industry, but also demands its products to have higher high voltage endurance, from high-voltage (100kV-300kV) to ultra-high-voltage (over 1000kV), and meanwhile raise more strict demands on the stability and the reliability, the environmental suitability and the service life. Contact finger is the key part of high-pressure isolating switch, the key components performance and life determines the high voltage switch whole product quality and life, and then determines the safe running of power transmission network. The requirements on the materials, structures and the processes of the key parts were increased with the increasing of the voltage class and the deliver capacity of the power transmission network. This paper mainly researches on the high-strength and high-conductivity copper alloy used in self-elastic contact fingers of high voltage isolator. Try to develop a high-strength and high-conductivity Cu-Cr alloy and its process technology of strips that can meet the service conditions of the self-elastic contact fingers by the experimental investigation. The Cu-Cr alloy used in self-elastic contact fingers was researched by four different processes. Based on the performance requirements by the high-voltage isolating switch on the self-contact fingers material, the Cu-Cr alloy strips with different properties were separately prepared by different process. The electrical conductivity and hardness properties of the Cu-Cr alloy strips were tested. The influence of process and the parameters of aging treatment on the properties were studied. The process parameters were proposed to meet different batch and performance requirements. The microstructures of the Cu-Cr alloy strips were also examined with light microscopes and transmission electron microscopy (TEM). The research is to explore the engineering applications on high voltage isolator for providing theoretical basis about Cu-Cr alloy strips.The following contents are considered as the main conclusions:Based on the traditional process of copper alloy sheets and strips, four processes used for the Cu-Cr alloy strips were proposed, and the properties of the Cu-Cr alloy under different treatment were studied. The results show that: under the experimental condition, all the optimum properties can meet the performance requirements of the self-elastic contact finger: hardness and electrical conductivity over than 110HB and 80%IACS, respectively.For processâ… performance best properties, however, the solid solution treatment is difficult to carry out, so it is not suitable for medium and small batch production. For processâ…¡has the process characteristics of less, flow short, and the forming process and the user performance reports show that it can meet the requirement of the self-elastic contact finger. So the processâ…¡is the optimum process for Cu-Cr alloy strips production with low cost. For processâ…¢andâ…£has the feasibility of industrial production, but compared with processâ…¡, the procedures are much more, and the cost increase. At the same time, processâ…¢compared with processâ…£, can obtained the better combination properties under the same condition. So the processâ…¢is the optimum process for Cu-Cr alloy strips production with combination properties under the premise of the cost allowed.The Cu-Cr alloy strips used in self-elastic contact finger were prepared by the new processed, and the forming performance was tested. The results show that: the Cu-Cr alloy strips perform good forming ability. The self-elastic contact finger preformed opening-closing stability, low temperature, and compared with the traditional copper have used lower material in practical use.
|
PDF Full Text Request