The role of degassing in XLPE power cable manufacture

Andrews, Tom; Hampton, R.N.; Smedberg, A.; Wald, Detlef; Waschk, V.; Weissenberg, W.

doi:10.1109/mei.2006.253416

Cited by 120 publications

(82 citation statements)

References 3 publications

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“…The total charge accumulation in the samples calculated using equation (1) are presented in Figure 10. The total charge from samples soaked in single byproduct is also included in the figure for comparison.…”

Section: Two Byproducts In Samplementioning

confidence: 99%

“…It has been found that, after crosslinking with Dicumyl Peroxide (DCP), the crosslinking byproducts such as acetophenone, -methylstyrene and cumyl alcohol have a significant influence on electrical properties of XLPE power cables [1]. Polymer is extruded such that the PE surrounds the conductor and cured at a high temperature and high pressure.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Two Byproducts In Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…are still present within the XLPE insulation [8]. These by-products may be present in the material for a long period of time and will undergo ionization process under a high electric field.…”

Section: Resultsmentioning

confidence: 99%

Space charge accumulation under effects of temperature gradient and applied voltage reversal on solid dielectric DC cable

Choo

Chen

Swingler

2009

2009 IEEE 9th International Conference on the Properties and Applications of Dielectric Materials

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Abstract:A well-known fact of the existence and accumulation of space charge within the insulating material poses threat to the reliability in the operation of dc power cables. When power cables are loaded under high voltage direct current (HVDC), temperature gradient is developed across the insulation. Results of space charge evolution in commercial ac XLPE power cables under an application of 80 kV dc supply at different temperature gradients and during external voltage reversal are discussed in this paper. The space charge distributions were measured across the insulation of the cable by means of a modified pulsed electroacoustic (PEA) system with a current transformer attached. Therefore, a replica of a power cable under load conditions could be obtained, which allows us to investigate the formation, migration and accumulation of space charges in a power cable both without and with different temperature gradients consideration across the bulk of the insulating material during voltage reversal. Discussion will be made thoroughly in order to understand the space charge phenomenon of power cable under its service temperature as space charge accumulation during polarity reversal plays an important factor on the electric field distribution within the insulation material.

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“…In order to remove the Methane all XLPE insulated cables (AC or DC) are heat treated with ventilation (also known as degassing). In case of DC cables, degassing helps to remove the polar species and decreases their influence on conductivity [4]. Generally, degassing of XLPE leads to reduction of its conductivity [5] and generally it has been attributed to the removal of polar species from the insulation.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on morphology and dielectric properties of PE cable insulation material

Ghorbani¹,

Hoq

Edin

2017

NORD-IS

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It is known that the heat treatment process in the production of extruded cables, affects the electrical properties of polymeric insulation materials; this effect is via two main phenomena; first, it leads to diffusion and removal of polar substances from the system; second, it affects the polymer morphology by increasing the polymer chain relaxation and creation of crystallites, hence increasing the crystallinity of the material. In this study, thick pressed samples with additive free low density polyethylene (LDPE) insulation material were heat treated at different conditions for different periods of times. Differential scanning calorimetry (DSC) measurements confirmed that heat treatment leads to higher crystallinity and higher lamella thickness in LDPE. Dielectric properties of the material was studied by conduction current measurement and dielectric spectroscopy. Conduction current of samples with different heat treatment times was measured at high electric fields which shows that the conduction current of LDPE is affected by heat treatment. Generally, the apparent conductivity decreases by heat treatment. Dielectric spectroscopy measurements show that heat treatment does not have a significant effect on real and imaginary permittivity of the polymer. Interestingly, an increase in the sample thickness via heat treatment, was observed both by sample thickness related to the memory effects in the polymer which needs to be taken into consideration for accurate capacitance measurements.

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The role of degassing in XLPE power cable manufacture

Cited by 120 publications

References 3 publications

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

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

Space charge accumulation under effects of temperature gradient and applied voltage reversal on solid dielectric DC cable

Effect of heat treatment on morphology and dielectric properties of PE cable insulation material

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