EFFECTS OF MULTIPLE STRESSES ON POWER CABLES AND ENERGY STORAGE DEVICES-A COMPARATIVE STUDY

Multiple stress life tests are becoming increasingly useful in today's industry in order to develop efficient tools to predict performances of electrical systems. In Electrical Engineering domain, the life of a systems or product is developed as a function of single or multiple stresses. The actual mathematical models applied for life analyses are Statistics (Proportional Hazards) based models and Empirical-Statistics models (Arrhenius, Weibull). In this paper was used a life-stress model: Arrhenius- Weibull. In this sense, it was developed a multiple stress analysis in order to identify the effects of multiple stresses on power cables and supercapacitors life distributions. Both analysed electrical systems can be implemented together in different power supply systems from land transportation. The analysis was developed using ALTA software package from ReliaSoft Corporation and the multiple stresses considered where: temperature, humidity, vibrations and on/off cycling operation, only for supercapacitors. The analysis results consist of a proposed comparative model regarding mixed stresses that may occur on power cables/ supercapacitors and how these effects could influence future performances of a supply power system/ energy recovery system. All the obtained data after ALTA application are related to life distributions and plots modeling. The determined plots refers to: PDF plots, Life vs. Stress, Weibull plots, Acceleration factor vs. Stress, Failure rate vs. Time, Standard Deviation vs. Stress.

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