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• W2146337536 abstract "We have investigated the surface heating effects of drawn vacuum arcs for several industrial designs of axial magnetic field (AMF) contacts, using near infrared (IR) photography of the Cu-Cr arcing surfaces with an image-intensified charge-coupled device (CCD) camera and an IR pyrometer. This enables detailed contact temperature mapping immediately after a half-cycle of arc current. The very homogeneous temperature distribution observed at current zero stands in contrast to the visually nonhomogeneous high-current diffuse arc, which was studied in separately reported experiments using high-speed digital photography and arc voltage measurements. The peak temperature at current zero increased relatively linearly with the peak current I/sub P/, and reached well beyond the melting range. We combine the temperature maps with a heating model to determine the thermal sheath thickness after arcing and its dependence on I/sub P/. The results suggest that near the interruption limit of AMF contacts, the interaction of the stable high-current arc with the anode and cathode is dominated by processes induced by flowing liquid metal, which redistributes the heat input from the axially concentrated arc over most of the contact surface. Furthermore, the flow of liquid metal off the cathode and anode faces contributes to the overall contact erosion." @default.
• W2146337536 created "2016-06-24" @default.
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• W2146337536 date "2001-06-01" @default.
• W2146337536 modified "2023-09-29" @default.
• W2146337536 title "Contact temperature and erosion in high-current diffuse vacuum arcs on axial magnetic field contacts" @default.
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• W2146337536 doi "https://doi.org/10.1109/27.928943" @default.
• W2146337536 hasPublicationYear "2001" @default.
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