From LDPE to XLPE: investigating the change of electrical properties. Part I. space charge, conduction and lifetime

Montanari, Gian Carlo; Laurent, Christian; Teyssèdre, G.; Campus, A.; Nilsson, U.H.

doi:10.1109/tdei.2005.1453448

Cited by 120 publications

(48 citation statements)

References 21 publications

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“…The free electron densities are ∼ 3.38 × 10 −2 C·m −3 and 3.93 × 10 −2 C·m −3 at the initial surface potentials of −1093 and −2056 V at t = 94.5 h, respectively. Then, we can obtain the resistivity of polyimide, which is ∼ 8.08 × 10 16 -9.40 × 10 16 · m. The results are in good agreement with that measured by charge storage decay resistivity test [9], [58] and SPD methods [12], [13]. The resistivity of polyimide shows that it is too high to be measured by the ASTM method [10], [11].…”

Section: B Space Charge Evolution During Spdsupporting

confidence: 72%

“…Because the high field regime determines charge leakage speeds at high electric fields and prebreakdown characteristics or electrical life, it may be more important for spacecraft charging/discharging than the ohmic regime [16], [17]. The charge transport at high electric fields is attributed to charge injection, charge carrier mobility, trap energy and trap density, trapping and detrapping probabilities, and so forth.…”

Section: Introductionmentioning

confidence: 99%

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Investigation Into Surface Potential Decay of Polyimide by Unipolar Charge Transport Model

Min

Cho

et al. 2013

IEEE Trans. Plasma Sci.

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To predict spacecraft charging levels and mitigate electrostatic discharges, it is very important to understand the charge transport properties of highly insulating materials such as polyimide. The combination of surface potential decay (SPD) experiment and unipolar charge transport (UCT) model investigates the charge transport properties of polymide. In a simulated space environment chamber, the SPD experiments are performed on polymide. After irradiated by electron beams, the surface potential distributions of the sample are measured by a noncontact potential probe (Trek). The UCT model that consists of relaxation polarization, charge injection, charge migration, charge trapping, and detrapping processes simulates the SPD results. In the numerical UCT model, we solve the charge continuity equation by Runge-Kutta discontinuous Galerkin method and Poisson's equation by boundary element method. The least square error between the experimental and the simulated SPD results is searched by genetic algorithm (GA). From the GA calculation, we optimize the charge transport parameters of polyimide. Then, we calculate the space charge evolution properties during the SPD process of polyimide by the UCT model. These charge transport parameters, then, can be used to study the surface charging or deep dielectric charging of the insulator.Index Terms-Charge transport properties, polyimide, surface potential decay (SPD), unipolar charge transport (UCT).

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Section: B Space Charge Evolution During Spdsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Investigation Into Surface Potential Decay of Polyimide by Unipolar Charge Transport Model

Min

Cho

et al. 2013

IEEE Trans. Plasma Sci.

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“…The reason for using LDPE over XLPE is to eliminate any possibility of having more than one byproduct in the system. Even though previous studies by N. Hirai [6] show that space charge characteristics in LDPE and degassed XLPE are similar, it has been proven that under stress, the amount of space charge accumulation differs [7] . In addition, the possibility of having byproduct-free XLPE via degassing cannot be guaranteed [8], thus, LDPE is chosen over XLPE.…”

Section: Sample Preparationmentioning

confidence: 87%

Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Hussin

Chen

2012

IEEE Trans. Dielect. Electr. Insul.

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Cross-linking byproducts are suspected to be the main contributing factor in space charge formation observed in XLPE. To investigate the mechanism behind this phenomenon, low density polyethylene was soaked into three main crosslinking byproducts, acetophenone, -methylstyrene and cumyl alcohol, and space charge measurements were performed using the Pulse Electroacoustic technique (PEA). It has been found that soaking LDPE in cumyl alcohol introduces more charges into the system, with homocharges and heterocharges accumulating within the sample compared to the additive free sample. In contrast, -methylstyrene and acetophenone reduce the amount of accumulated charges. In terms of charge decay, all three byproducts enhance the decay process in the insulator. Further investigations were conducted in conditions where two byproducts are present in a sample. The results shows that acetophenone is a dominant byproduct in determining the charge density patter built up during the charging process, whilst the rate of charge decay is observed to be high in the presence of -methylstyrene in the sample.

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“…Equation (20) indicates that the relation between J and E may be not linear in the presence of space charge; hence a deviation from Ohm's law appears above the limit field for space charge accumulation. This limit field, which is associated with a bend in the J vs. E (log-log) characteristic, has been identified as the threshold for trapped space charge accumulation [18,43,44,61].…”

Section: Voltagementioning

confidence: 99%

“…A lot of work has been done already on conduction current measurement and space charge observation, mostly some decades ago regarding conduction current and in the last 10 years for space charge [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Actually, space charge phenomena are still broadly investigated for both measurement techniques and physical explanations.…”

Section: Introductionmentioning

confidence: 99%

Bringing an insulation to failure: the role of space charge

Montanari

2011

IEEE Trans. Dielect. Electr. Insul.

268

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Considering the title of this paper, one might think that everything has been said, shown, proven and discussed already on ageing and failure of electrical insulating materials, based on at least half century of research work and field feedbacks. However, perhaps there is still room to collect ideas and speculate on apparently proven or brand new concepts, such as the interrelation between ageing mechanisms and physically measurable quantities such as space charge, partial discharges and conduction current. The latter is, indeed, the scope of this paper, which is taken from the Whitehead Memorial Lecture given at the 2010 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). On one hand we will revisit the concepts of space charge accumulation in insulating (polymeric) materials, considering also the latest achievements which deal with ultra-fast charge pulses (solitons), on the other hand we will discuss how space charge can contribute to ageing rate under dc, ac or impulsive voltage, directly through electric field alteration, or indirectly modifying a fundamental ageing factor such as partial discharges.The goal is, at the very end, to show how much such basic investigations can have a fundamental impact on insulation design and electrical apparatus long-term performance/ reliability. Index Terms -Space charge,degradation, charge packets,aging models, partial discharges, insulation breakdown. 2 2 4 ,where J ii is the impact ionization rate, I is the ionization energy, J DEA is the Dissociative Electron Attachment Gian Carlo Montanari (M'87-SM'90-F'00) was born on 8 November 1955. In 1979, he took the Master degree in electrical engineering at the University of Bologna. He is currently Full Professor of Electrical Technology at the Department of Electrical Engineering of the University of Bologna, and teaches courses of Technology and Reliability. He has worked since 1979 in the field of aging and endurance of solid insulating materials and systems, of diagnostics of electrical systems and innovative electrical materials (magnetics, nanomaterials, electrets, superconductors). He has been also engaged in the fields of power quality and energy market, power electronics, reliability and statistics of electrical systems. He is a member of AEI and Institute of Physics. He is a member of the AdCom of the IEEE DEIS. Since

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From LDPE to XLPE: investigating the change of electrical properties. Part I. space charge, conduction and lifetime

Cited by 120 publications

References 21 publications

Investigation Into Surface Potential Decay of Polyimide by Unipolar Charge Transport Model

Investigation Into Surface Potential Decay of Polyimide by Unipolar Charge Transport Model

Analysis of space charge formation in LDPE in the presence of crosslinking byproducts

Bringing an insulation to failure: the role of space charge

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