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A long-term aging experiment is currently under way on six stator bars subjected to slot partial discharges (PD) activity under electrical, thermal and mechanical stresses. Slot PD were induced on each bar by abrading a portion of their semi-conductive coating. All bars were subjected to accelerated aging at twice their nominal voltage. Two bars were only electrically stressed, two others were electrically...
The microstructure, mechanical response, and failure behavior of lead free solder joints in electronic assemblies are constantly evolving when exposed to isothermal aging and/or thermal cycling environments. In our prior work on aging effects, we have demonstrated that the observed material behavior variations of Sn-Ag-Cu (SAC) lead free solders during room temperature aging (25degC) and elevated...
Effect of a variable and continuous load on top-oil (TOT) and hot-spot (HST) temperature rise and in turn, on aging of mineral-oil-immersed transformers has been well studied. Detailed loading procedures covered in relevant IEEE Standard serve utilities manage critical assets in the form of power and distribution transformers. Current transformers (CT) have neither been specifically addressed nor...
This paper describes an analysis of the reliability of AlGaN-based deep-UV Light-Emitting Diodes (LEDs) emitting in the range 280-340 nm. LEDs have been aged at their nominal operating current, and during treatment their electrical and optical characteristics have been continuously monitored. Measurement results show that (i) constant current stress can induce degradation of the optical power emitted...
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