4th International Conference on Electric Power Equipment– Switching Technology (ICEPE-2017)

670 / 2017-05-25 14:33:23

Interruption Characteristics on the Sintering for Cu-Cr Contact Material

14524,14523,13843

The vacuum interrupter's contact is one of the most important components for ensuring the successful operation of the vacuum interrupter. Cu-Cr could be used as a vacuum interrupter contact material. Cu-Cr contacts have become so widely accepted that now they are used in nerarly all the commercial medium-voltage, high-current vacuum interrupters. a mixture of Cu and Cr powders is pressed together and then sintered in high vacuum condition. Sintering process can be classified into soild phase intering and liquid sintering. This paper examined the surface of the contact accoding to sintering method and compared the ability to short-circuit. The surface was checked through a SEM. The short circuit test proceeded with a limit test 25kA to 40kA. The results were obtained that at the same rating, the solid phase sintering had higher performance than the liquid sintering. The results showed for the CuCr contact, the solid phase sintering method was able to reduce the erosion of contacts.