Electrical and electronic components are very important subcomponents in modern industrial wind turbines. Complex multimegawatt wind turbines are continuously being installed both onshore and offshore, continuously increasing the demand for sophisticated electronic and electrical components. In this work, most critical electrical and electronic components in industrial wind turbines have been i...

Nowadays, the most widely used insulating materials in high voltage equipment such as cables are polymeric insulations due to the numerous merits they possess with regards to electrical performance compared to paper insulations. However, electrical treeing, one of the dielectric pre-breakdown phenomena, has been considered as a major contribution to the failure of insulating polymeric materials...

Catastrophic failure of lithium-ion batteries occurs across multiple length scales and over very short time periods. A combination of high-speed operando tomography, thermal imaging and electrochemical measurements is used to probe the degradation mechanisms leading up to overcharge-induced thermal runaway of a LiCoO2 pouch cell, through its interrelated dynamic structural, thermal and electric...

This thesis studies the characteristics of cascading failures in a simulated linear swingequation model for simple power networks. The model transitions from displaying only small average failure size to undergoing large average failure size as the loading of the system is increased. For some parameter values, the transition region becomes critical, and it exhibits failures of all sizes whose d...

Reliability models based on Markov chain (Except in queuing systems) have extensive applications in electrical and electronic devices. Here, we consider a k-out-of-n:G system with n parallel and identical elements with increasing failure rates (failure rates are Weibull distributed) and non repairable elements. The failure rate of remaining elements increases when some elements fail. The system...

The statistical properties of failure are studied in a fiber bundle model with thermal noise. We show that the macroscopic failure is produced by a thermal activation of microcracks. Most importantly the effective temperature of the system is amplified by the spatial disorder (heterogeneity) of the fiber bundle. The case of a time dependent force and the validity of the Kaiser effects are also ...

We present a general model for cosmic ray induced failures in high voltage devices. The only relevant model assumption is that the local probability depends only on the local electrical field. This model leads to a universal master curve for the failure rates of GTO's, thyristors and diodes. The IGBT is more complex because of the complex field distribution. The predicted and observed failure r...

Failure can be defined, in general, as an event that does not accomplish its intended purpose. Failure of a material component is the loss of ability to function normally. Components of a system can fail one of many ways, for example excessive deformation, fracture, corrosion, burning-out, degradation of specific properties (thermal, electrical, or magnetic), etc. Failure of components, especia...

eart failure is the commonest cardiovascular disease that causes high morbidity and mortality. In a selected group of patients with evidence of electrical dyssynchrony, cardiac resynchronization therapy plus defibrillator backup (CRT-D) was established as an important adjunctive therapy. Numerous landmark trials demonstrated that such therapy improved clinical symptoms and quality of life, redu...

Current failure analysis practices use diagnostic technology developed over the past 100 years of designing and manufacturing electrical and mechanical equipment to identify root cause of equipment failure requiring expertise with the equipment under analysis. If the equipment that failed had telemetry embedded, prognostic algorithms can be used to identify the deterministic behavior in complet...