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The increased application of HVDC components in electrical energy systems has led to new challenges in diagnostic testing and measurement of electrical insulation. In addition to other diagnostic methods Partial Discharge (PD) diagnosis at DC voltage is currently subject to much discussion worldwide. This is because the established and approved procedures, methods and evaluation techniques at AC voltages...
The aging of electrical insulation material is one of the main topics for designers of electrical appliances. Much effort has been devoted to prepare statistical or physical methods of life time estimation in real operation of electric machinery. One of the problems in the estimation of insulation operational life is the existence of threshold values at which the change of aging mechanisms occurs...
Until now not much attention was paid to behavior of insulating materials under different voltage stresses. For decades, the applied research was done generally under AC voltage. As power electronics was involved in drives and dominated instead of DC drives, new troubles with lifetime occurred. The great influence of higher harmonics does not affect operating parameters only but also it limits the...
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