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Polymer film is general used for stress buffer and dielectric film for Wafer Level Chip Scale Package (WLCSP). Chemical resistance and mechanical resistance of polymer films usually get worse after several processes with chemicals or heat. Weak chemical or mechanical resistance will induce polymer film cracking. Polymer cracking further induces humidity penetration into RDL (Re-distribution Layer)...
This paper investigated the streamer inception and breakdown properties of a mineral oil and a synthetic ester liquid under DC stress up to 100 kV. To observe the effect of tip radius on streamer inception, the point-plane electrodes configuration with a fixed gap distance of 10 mm and point electrode with the radii of 5 μm, 10 μm, 20 μm and 50 μm were used. To observe the effect of gap distance on...
The high level of reliability experienced by power transformers has led to the situation that a large number of aged units are still operating in the power systems. However, uncertainty on how transformers behave when aged causes concerns over the existence of possible hidden failure modes, which have yet to be revealed by failure data. In order to establish whether aged transformers are able to maintain...
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