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In this paper thermal characteristic and front facet of the 808 nm GaAs-Based laser diodes (LDs) before and after degradation are presented and discussed. The relation between thermal characteristic and the change of facet is analyzed. Aging tests are carried out under the conditions of the constant current stress (3 A), and the junction temperature of LD is fixed at 70°C. The total thermal resistance...
To ensure high reliability for advanced automotive electronics, investigation and understanding on the failure mechanisms under harsh conditions are needed. New methods and technologies for improved reliability and increased lifetime should be developed. In this paper, an investigation on the effect of high temperature aging on the thermomechanical properties, microstructure of the molding compounds...
We have developed a radio frequency (RF) transponder based on a surface acoustic wave (SAW) device (on a LiNbO3 substrate) that can be used at temperatures of up to 400degC. This paper compares the performance of several SAW metallization and packaging technologies. Thermal aging and cycle tests of the devices were performed. The transponders are shown to be suitable for wireless sensing issues in...
Insulating system of power transformers is mostly composed of two basic components: insulation oil and cellulose paper (oil-paper system). These components are of an organic nature and thatpsilas why they become very sensitive to operation degradation conditions (temperature, oxidation, moisture etc.). Aging of these components can endanger the failure free operation of the transformers. The main...
This paper describes the electrical characteristics of insulating oil employed in pole transformers. In the experiment, temperature and frequency were selected as variables, and dielectric characteristic values such as the relative permittivity, the tandelta and the specific resistance of the insulating oil were measured by a WinDETA system. As a result, the dielectric characteristics of the testing...
In power cable, thermal factor must be considered where heat generated in power cable must be limited and lower than thermal rating of insulation materials. Overheating on cable insulation material will cause the electrical insulation aging is accelerated. This paper is present the result of thermal incremental test of the medium voltage XLPE cable type N2XEBY with three core and analysis when time...
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