Abstract
Silver/tungsten powder metal electric contacts are used in circuit breakers because of their combination of high conductivity from silver, and high melting temperature from tungsten. In operations of the circuit breaker, switching arcs erode and oxidize the contact surface to create a high resistance layer that can lead to high temperature at the contacts. This arc erosion product is usually a mixture of silver, tungsten, tungsten oxides and silver tungstate. The formation of this layer and its distribution is modified by the metallurgy and electrical parameters. The measurement of the contact resistance depends on the random location of the contact spot and is therefore highly statistical in nature. Weibull distribution is used to analyze switching contact resistance in laboratory switch apparatus and commercial 20A circuit breakers. This is to understand the statistical nature of the measurement and the correlation to the dynamic contact erosion process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
