Effect of heat-treatment and sample preparation on physical properties of XLPE DC cable insulation material

Ghorbani, Hossein; Saltzer, Markus; Abid, Fahim; Edin, Hans

doi:10.1109/tdei.2016.7736807

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…The importance of a critical control of the sample storage, thermal history, electrical history and polymer processing was emphasized with a focus on consistent cooling rate during compression moulding, although it was at the same time shown that even the protective lm used for the compression moulding affected the results. 19,35 In the present work it is concluded that the data on the two different instrumental setups provided very similar data, although the protective lms used in the pressing of the materials were different, i.e. aluminium (CTH) and PET lm (KTH).…”

Section: Polymer Morphologysupporting

confidence: 52%

Lamellae-controlled electrical properties of polyethylene – morphology, oxidation and effects of antioxidant on the DC conductivity

Karlsson

Hillborg

et al. 2020

RSC Adv.

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Section: Polymer Morphologysupporting

confidence: 52%

Lamellae-controlled electrical properties of polyethylene – morphology, oxidation and effects of antioxidant on the DC conductivity

Karlsson

Hillborg

et al. 2020

RSC Adv.

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“…Annealing is a heat treatment method that is widely used in the research on crystalline polymer materials. Two annealing methods, isothermal treatment and thermal cycling treatment, have shown the ability to improve the thermal and electrical properties of XLPE at proper temperatures [7], [8]. Over the short timescale of the cable manufacturing period, the crystalamorphous structure does not reach the metastable state.…”

Section: Introductionmentioning

confidence: 99%

Annealing Effects on XLPE Insulation of Retired High-Voltage Cable

et al. 2019

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In this paper, the performance of several annealing methods on three retired cables and the annealing effects on the improvement in the thermal and electrical properties of cross-linked polyethylene (XLPE) insulation were discussed. The cable insulation layer was peeled, and the peels near the inner semi-conductive layer were used as the test samples. Isothermal treatment and heat recycling treatment were performed at temperatures of 85, 90, 95, and 100 • C, and the temperatures were held in the heat recycling treatment for 8, 16, and 24 h, respectively. Each heat recycling treatment was repeated 20 times, and the duration of the isothermal treatment was the same as that for the heat recycling treatment with a 24 h temperature holding hour. Then, Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) were performed, and the dielectric spectrum, DC conduction current, and dielectric breakdown strength E B were measured. The results showed that damage involving molecular changes is linearly related to the cable service year. As the annealing temperature increases, the melting range and electrical conductivity decrease; the melting point, crystallinity, lamellar thickness, and dielectric breakdown strength increase; and the optimal values appear for the samples annealed at 95 • C. With an increased temperature holding hour, the peels annealed at 95 • C exhibit a decreased melting range and electrical conductivity and an increased crystallinity, melting point, lamellar thickness, and dielectric breakdown strength. As a result, the two different treatments are verified to effectively improve the thermal and electrical properties for the XLPE as early research on cable rejuvenation by heat treatment.

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“…Secondly, PE20s appears to have a reduced conductivity relative to the XLPE reference. Since the same LDPE was used to formulate both systems, this behavior suggests two things; (a) cross-linking by-products in the XLPE may be increasing its conductivity [18], (b) the lamellar texture of PE20s is serving to impede charge transport [19]. Thirdly, the addition of DBS results in a slight uplift in conductivity in PE20d and the same uplift in conductivity is also suggested by comparing the traces from PP50s and PP50d.…”

Section: Electrical Propertiesmentioning

confidence: 82%

High performance polymer blend systems for HVDC applications

Hosier

Vaughan

Pye

et al. 2019

IEEE Trans. Dielect. Electr. Insul.

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Two polyethylene and two polypropylene blends crystallized under non-isothermal conditions were compared to a crosslinked polyethylene (XLPE) reference material. Selected blends contained a gelation agent, which forms a network structure within the material. Compared to XLPE, the blends offered higher melting points, reduced electrical conductivity, increased electrical breakdown strength, improved space charge performance and enhanced thermo-mechanical stability. Additional improvements in space charge behavior were also noted in systems containing the DBS gelation agent. The ability to provide recyclable insulation materials capable of operating at much higher temperatures than XLPE, combined with enhanced dielectric properties, may prove advantageous to cable manufacturers, particularly in renewable energy applications.

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Effect of heat-treatment and sample preparation on physical properties of XLPE DC cable insulation material

Cited by 16 publications

References 14 publications

Lamellae-controlled electrical properties of polyethylene – morphology, oxidation and effects of antioxidant on the DC conductivity

Lamellae-controlled electrical properties of polyethylene – morphology, oxidation and effects of antioxidant on the DC conductivity

Annealing Effects on XLPE Insulation of Retired High-Voltage Cable

High performance polymer blend systems for HVDC applications

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