Investigation of welding characteristics and NSDD probabilities of different contact materials under capacitive load conditions

Abstract

This paper compares characteristics of cold welding and welding formed due to prestrike with making current typical for capacitive load switching. Several CuCr contact materials manufactured using different technologies are investigated. The correlation between these characteristics and NSDD probability obtained in a synthetic single-phase scheme, imitating capacitive load switching in “O”, “CO for 600A/500Hz making current” and “CO for 3kA/500Hz making current” modes is studied in this paper. The connection between welding and dielectrical characteristics of different materials is demonstrated. Typical contact surface after the abovementioned operations for each of the studied materials is described.