Electrical aging tests on different nanostructured enamels subjected to severe voltage waveforms

Guastavino, F.; Ratto, A.; Torello, E.; Biondi, Giovanna; Loggi, G.; Ceci, A.

doi:10.1109/demped.2011.6063636

Cited by 10 publications

(8 citation statements)

References 18 publications

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“…As stated in the introduction, this study concerns only the secondary part (which consists of the impregnation varnish) of an inverter-fed rotating machine insulation system (composed of impregnation varnish and enameled wires). It is common knowledge that partial discharges occur in rotating machines fed by inverters [6] [31][32][33]. The impregnation varnish is the first element of the insulation system to be in contact with partial discharges and becomes the most affected part.…”

Section: A Materialsmentioning

confidence: 99%

“…In this approach, the description of the insulation degradation in a partial discharge regime is taken into consideration. In this specific case, the effect of the electrical stress level on the insulation lifespan is most often represented by the inverse power model [35], such as in (6):…”

Section: A Step 1: Study Preparation 1) Choice Of the Response And Fmentioning

confidence: 99%

“…This model presents a logarithmic form of electrical stress (i.e. voltage and frequency) and an exponential form of the temperature according to (6) and (7). Consequently, the corresponding model can be expressed in (8):…”

Section: Fig 3 Effect Of Temperature On Insulation Lifespan From -5mentioning

confidence: 99%

“…Combining the different stresses quoted earlier could have a dramatic effect on both bearings and stator winding insulation [7]. As an example, [6] points out the behavior under severe waveforms of three different insulating organic enamels on twisted pairs, subjected to electrical degradation due to breakdown voltage tests. The conclusion is that the PEI enamel with nano-sized silica is better with respect to the other tested materials but does not give any lifespan model.…”

Section: Introductionmentioning

confidence: 95%

“…Consequently, accelerated aging tests are usually performed in order to study and predict the lifespan. This kind of test can be used for different objects in electrical engineering such as IGBT modules [5] in high temperature power cycling or nano-structured enamels on twisted pairs [6]. These tests are used to obtain failure statistics.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Aging of the Insulation of Low-Voltage Machines: Model Definition and Test With the Design of Experiments

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IEEE Trans. Ind. Electron.

109

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The aim of this paper is to present a method for modeling the lifespan of insulation materials in a partial discharge regime. Based on the design of experiments, it has many advantages: it reduces the number of time-consuming experiments, increases the accuracy of the results and allows lifespan modeling under various stress conditions including coupling effects between the factors. Accelerated aging tests are carried out to determine the lifespan of these materials. The resulting model presents an original relationship between the logarithm of the insulation lifespan and that of electrically applied stress and an exponential form of the temperature. Results show that the most influential factors can be identified according to their effects on the insulation lifespan. Moreover, the lifespan model validity is tested either with additional points which have not been used for modeling or through statistical tests. Finally, it is shown that fractional plans are not suitable to r e d u c e t h e n u m b e r o f e x p e r i m e n t s. T h i s a p p l i c a t i o n o f t h e experimental design is best used during the initial phase, before the final drive has been built and any on-line diagnostic.

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