Influence of press films on conduction in polyethylene plaque samples

Ghorbani, Hossein; Olsson, Cecilia; Abbasi, Amirhossein; Saltzer, Markus

doi:10.1109/icd.2016.7547828

Cited by 4 publications

(2 citation statements)

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“…Further, a clear correlation was found between the types of the protective film used during the press molding of the samples. This observation was communicated in the previous publications [1] and [2] where the observation of conductivity peaks was correlated with using polyethylene terephthalate (PET) film during the press molding of the sample. While PET film is a very common protective press film for polymeric sample preparation, there is sparingly little studies on its potential influence on the composition of the polymer samples.…”

Section: Introductionmentioning

confidence: 87%

“…It has been reported that pressing LDPE samples with PET film may lead to introduction of carbonyl groups at the sample surface and strongly influences the space charge measurement results [3]. The space charge behavior of LDPE samples pressed with PET film exhibit different space charge behaviors from sample pressed with aluminum foil [2] and [4]. At higher temperatures, PET may undergo decomposition reactions forming diffusive chemicals such as acetaldehyde which may migrate into the polymer sample [5].…”

Section: Introductionmentioning

confidence: 99%

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DC conductivity of polyethylene and crosslinked polyethylene measured with a dynamic temperature program

Ghorbani¹,

Olsson²,

Jeroense³

2017

NORD-IS

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Electrical conductivity of HVDC cable insulation materials is important for its function. It is very practical to evaluate this parameter by DC conductivity measurements on press molded polymeric plates samples. While in real operation conditions, the insulation undergoes both static and dynamic thermal conditions, most of the published research in this area is still focused only on steady state thermal conditions. In this work, the focus is instead on the behavior of electrical conductivity under dynamic thermal conditions. Press molded XLPE and LDPE plate samples with different preparations are tested under 25 kV/mm DC field with a dynamic temperature profile ranging from room temperature to 90 °C. It was discovered that in many cases, the measured conductivity during dynamic measurements strongly deviates from the expected Arrhenius temperature dependence; instead the conductivity shows a nonmonotonic temperature dependence manifested as conductivity peaks during heating and cooling. The behavior is found to be strongly related to the type of protective film used during press molding of the sample; further degassing leads to a reduction of the nonmonotonic temperature dependence and with long degassing the behavior tends to the expected Arrhenius temperature dependence.

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Section: Introductionmentioning

confidence: 87%