A Multi-dimensional Model to Describe the Ageing Process in Polymers Used for Electrical Insulation

Lahoud, Nadine; Boudou, Laurent; Martinez‐Vega, Juan

doi:10.1109/icsd.2007.4290757

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…However, the interpretation of the resulting data presents a challenge since space charge by definition is the net charge in a given locality. This results from the accumulation of charges of both positive and negative polarity whose dynamics are separately governed by a number of processes such as mobility, trapping and de-trapping, ionization and recombination as well as injection and extraction all of which need to be considered in the formulation of a model [15][16][17]. This is especially the case during space charge accumulation when the relative importance of the various processes may vary in time as the field and other factors change.…”

Section: Introductionmentioning

confidence: 99%

The effect of dc poling duration on space charge relaxation in virgin XLPE cable peelings

Tzimas

Rowland

Dissado

et al. 2010

J. Phys. D: Appl. Phys.

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The effect of DC poling time upon the time-dependent decay of space charge in insulation peelings of Cross-linked Polyethylene (XLPE) cable that had not previously experienced either electrical or thermal stressing is investigated. Two DC poling durations were used, two hours and twenty six hours at an electric field of 50kV/mm and at ambient temperature. Space charge was measured in the two samples investigated both during space charge accumulation and throughout its subsequent decay. The results show that the length of DC poling plays an important role in the subsequent decay. Despite the fact that both samples have had the same amount of space charge by the end of both short and long poling durations the time dependence of the space charge decay is different. Most of the charge stored in the sample that had experienced the short time poling decays rapidly after voltage removal. On the other hand the charge that is stored in the sample with the long DC poling duration decays slowly and its decay occurs in two stages. The data, which is analysed by means of the detrapping theory of space charge decay, implies that the charge stored in the material has occupied energy states with different trap depth ranges. The two poling durations lead to different relative amounts of charge in each of the two trap depth ranges. Possible reasons for this are discussed. Voltage on Volt off SC-2min Volt off SC-14min

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Section: Introductionmentioning

confidence: 99%

The effect of dc poling duration on space charge relaxation in virgin XLPE cable peelings

Tzimas

Rowland

Dissado

et al. 2010

J. Phys. D: Appl. Phys.

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“…Indeed, the life of an electrical system is fairly often limited by the electrical insulation reliability. For this reason, several models have been developed to account for physical, thermal and electro-mechanical aspects of the ageing process and the insulation life-end [1][2]. However, modeling the kinetics of organic insulation deterioration is difficult and complex, the difficulty is compounded by the fact that many different stresses can affect the rate of insulation degradation.…”

Section: Introductionmentioning

confidence: 99%

Using the design of experiments (DoE) method to elaborate an electrical ageing model for the insulation of low voltage rotating machines fed by inverters

Lahoud

Nguyen

Maussion

et al. 2010

2010 10th IEEE International Conference on Solid Dielectrics

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A large amount of parameters related to both operating conditions and material design affects the electrical ageing of the low voltage rotating machine insulation. Accelerated ageing tests are usually undertaken in order to develop a theory to describe the electrical ageing process and to determine a lifetime model of these materials. However, to the best of our knowledge, there is no complete model allowing the prediction of an insulation lifetime from accelerated ageing tests, since there are many possible failure mechanisms and various synergetic effects between them. Another problem with accelerated ageing tests is that results of the tests tend to have a great deal of scatter. In the present work, we propose the use of the design of experiments (DoE) method, which is a useful statistical approach that would lead to a reliable and significant interpretation of the different ordering parameters of the insulation ageing process. Using the DoE method, the analysis of accelerated ageing test results allows identifying the factors that most influence the results, and those that do not, as well as details such as the existence of interactions and synergies between these factors. In the following, results from accelerated ageing tests on PEI varnishes, largely used in rotating machines insulation, are presented and analyzed with the DoE method.

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“…Over the last decades, several models have been proposed for the electrical insulation life-end modeling [1][2][3][4] with respect to the physical, thermal and electro-mechanical aspects of the electrical ageing process. Despite these studies, this phenomenon remains complex and difficult to understand, forecast and at least model.…”

Section: Introductionmentioning

confidence: 99%

“…Despite these studies, this phenomenon remains complex and difficult to understand, forecast and at least model. Particularly, the rate of insulation degradation in rotating machines fed by inverters could be affected by many operating factors such as voltage, frequency, temperature, pressure… and these stresses could have many synergetic effects between them [4].…”

Section: Introductionmentioning

confidence: 99%

Electrical ageing modeling of the insulation of low voltage rotating machines fed by inverters with the design of experiments (DoE) method

Lahoud

Faucher

Malec

et al. 2011

8th IEEE Symposium on Diagnostics for Electrical Machines, Power Electronics &Amp; Drives

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In the context of more electric aircrafts, the reliability of the low voltage insulation systems in rotating machines is an important issue. But, modeling and understanding their electrical ageing is a complex phenomenon especially when they are fed by PWM inverter. They involve a large amount of parameters related to both operating conditions and material design, which act together. Accelerated ageing tests are usually run in order to describe the electrical ageing process and to determine the lifetime of these materials. Nevertheless, full ageing tests with all the various parameters for different samples become rapidly time consuming. Moreover, there is not any complete model for insulation lifetime prediction under accelerated ageing tests. In this paper work, we propose a method based on the design of experiments (DoE) method, which is a useful statistical approach that would lead to a reliable and significant interpretation of the different ordering parameters of the insulation ageing process. Moreover, this method will help to reduce the number of required experimental or numerical trials and will, take into account the possible failure mechanisms and the various synergetic effects between them. Using the (DoE) method, a preliminary model of the insulation "lifetime" is presented with respect to the most important parameters at play and interactions between them.Keywords: insulating and magnetic materials, remaining life models, ageing tests, design of experiments; ageing model I.

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A Multi-dimensional Model to Describe the Ageing Process in Polymers Used for Electrical Insulation

Cited by 4 publications

References 15 publications

The effect of dc poling duration on space charge relaxation in virgin XLPE cable peelings

The effect of dc poling duration on space charge relaxation in virgin XLPE cable peelings

Using the design of experiments (DoE) method to elaborate an electrical ageing model for the insulation of low voltage rotating machines fed by inverters

Electrical ageing modeling of the insulation of low voltage rotating machines fed by inverters with the design of experiments (DoE) method

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