The effect of degassing on morphology and space charge

Chong, Y.L.; Chen, G.; Ho, Y.F.F.

doi:10.1109/icsd.2004.1350315

Cited by 15 publications

(10 citation statements)

References 3 publications

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“…The network not only improves the heat resistance, but also can enhance durability such as more resistance towards chemical and stress cracking [3]. Thermal and mechanical properties of PE can be significantly enhanced by the crosslinking process [4] and for this reason, XLPE cables are the best choice in power industry for high voltage applications. In crosslinking, the polymer chains are linked together through chemical reaction by the activation of crosslinking agent under high temperature.…”

Section: Introductionmentioning

confidence: 99%

The impacts of the temperature and electric field on the electrical characteristics in semicon-bonded XLPE insulation

Hao

Fazal

Chen

et al. 2016

2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)

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-HVDC cables play a vital role in the power transmission system for renewable energy and global power trade. Nowadays, the crosslinked polyethylene (XLPE) extruded cables have been widely applied in power industry due to the superior performance on the thermo-mechanical properties and dielectric properties. The low volume conductivity and the minimized space charge accumulation are the two key requirements for a reliable high voltage direct current (HVDC) cable insulation. This paper reports on the impact of temperature and electric field on the space charge behavior and DC conductivity in XLPE material for cable insulation. The samples were carefully prepared to simulate the real cable insulation structure. A layer of LDPE film mixed with DCP (dicumyl peroxide) was sandwiched between two layers of semicons (also contain crosslink agent) and then crosslinked at 200 ᵒC to ensure the semicon layers were thermally bonded with the XLPE insulation. The crosslinked samples were then degassed in the vacuum oven with for 6 days at 80 ᵒC. The space charge characteristics and the conductivity of the semicon-bonded XLPE samples were measured at room temperature and high temperature. The electric fields were kept at 20 kV/mm and 40 kV/mm and the influences of the electric field and the temperature on space charge dynamics and conductivity in the semicon-bonded XLPE samples are discussed.

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Section: Introductionmentioning

confidence: 99%

The impacts of the temperature and electric field on the electrical characteristics in semicon-bonded XLPE insulation

Hao

Fazal

Chen

et al. 2016

2016 IEEE International Conference on High Voltage Engineering and Application (ICHVE)

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“…91 A number of experiments have been designed for the clarification how the crosslinking byproducts affect the space charge formation and which byproduct is the dominant. 69,88,[92][93][94] For instance, Maeno et al 69,[92][93][94] reported that cumyl-alcohol is responsible for homo-charge in LDPE and XLPE, acetophenone for heterocharge in XLPE, and -methylstyrene has no effect in LDPE but provides traps in XLPE. It is believed that space charge can be significantly reduced with a proper elimination of all the crosslinking by-products (de-gassing), water, and carbonyl groups.…”

Section: Additives and Cross-linking By-productsmentioning

confidence: 99%

Research progress on space charge characteristics in polymeric insulation

Zhang¹,

Christen

Meng³

et al. 2016

J. Adv. Dielect.

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Due to their excellent electrical insulation properties and processability, polymer materials are used in many electrical products. It is widely believed that space charge plays an important role for the electric field distribution, conduction, ageing, and electric breakdown of polymeric insulation. This paper reviews measurements and characteristics of space charge behavior which mainly determined by the pulsed electro-acoustic (PEA) measurement technique. Particular interests are the effects of the applied voltage, the electrodes, temperature, humidity, microstructure, additives, and filler materials on accumulation, distribution, transport, and the decay of space charge in polymeric materials. This review paper is to provide an overview on various space charge effects under different conditions, and also to summarize the information for polymeric materials with suppressed space charge and improved electrical behavior.

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“…If the level of the byproducts changes significantly over time, the dielectric properties of the insulation in the cable can change. The electrical performance of the cable can be altered if such a change occurs after it is installed [5]. Of particular concern is the volatilization of these materials.…”

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confidence: 99%

A New Method for the Detection and Quantification of Residual Volatiles in XLPE Electrical Cable Using Large-Spot Raman Spectroscopy

Kemper

Philippczyk²,

Rayzak³

et al. 2011

IEEE Trans. Power Delivery

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The residual products of the cross-linking process for high-voltage (HV) and medium-voltage (MV) cable materials are manifold but the two most important byproducts are cumyl alcohol (CA) and acetophenone (AC). Due in part to the presence of these byproducts, cables must be degassed for several days at elevated temperature before the product can be shipped, possibly limiting production throughput. There are few analytical means available to conveniently monitor the quantities of these byproducts during degassing. In this paper, we describe the use of a recently developed technology and enhanced measurement technique that employs large-spot Raman spectroscopy for the quantification of CA and AC. The sampling involves the use of an incident laser spot which can range from 1 to 6 mm in diameter to facilitate the achievement of accurate quantitative results. This approach would allow monitoring of degassing so that an accurate, results-oriented specification could be set for the shipment of HV and MV cable products following production. As such, this methodology has the potential to facilitate better product consistency among manufacturers.

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The effect of degassing on morphology and space charge

Cited by 15 publications

References 3 publications

The impacts of the temperature and electric field on the electrical characteristics in semicon-bonded XLPE insulation

The impacts of the temperature and electric field on the electrical characteristics in semicon-bonded XLPE insulation

Research progress on space charge characteristics in polymeric insulation

A New Method for the Detection and Quantification of Residual Volatiles in XLPE Electrical Cable Using Large-Spot Raman Spectroscopy

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