In recent years, the increasing penetration of the electric energy carrier into a large number of industrial products and sectors through the proliferation of electrical devices (machine-converters-storage) has led to complex systems with stringent requirements of operational safety and availability which can be very critical for certain applications. By way of example, in 2011 the automotive industry implemented standard 1S0 26262:2011, which would guarantee the functional safety of a vehicle on-board system. Similarly, standards ED-12C and DO-178C concern safety analysis for avionics.It should be noted that this expansion of the electrification of machinery and objects in different sectors of human activity has been accompanied by a dramatic increase in the production of electrical machinery and static converters worldwide. This new situation accentuates the need for energy conversion and transformation systems (devices and components) which, if not totally immune, possess intrinsic availability qualities despite the occurrence of a defect.Thus, these increasingly high system availability and safety requirements imply new requirements in the research effort on diagnostic/pronostic methods and methodology of electrical devices with a return to their design in order to structurally integrate availability through their ability to be tolerant to certain defects. The diagnosis consists of detecting, locating and identifying defects enabling supervisory systems to act effectively by applying one of the scenarii of fault tolerance, namely accommodation, reconfiguration or restructuring according to the degree of severity of the defect. The prognosis predicts the future state of operation of the relevant equipment subject to an international standard (ISO, 2004). Thus, prognosis is seen as a key process in maintenance strategies. It is within this framework that GREAH and IRESEM combine their forces by forming a multidisciplinary project team capable of dealing with many of the multiple aspects of the issue of safety and availability of electrical energy conversion and transformation devices
