The continuing evolution of semiconductor materials for power cable applications

Jäger, Karl-Michael; Lindbom, L.

doi:10.1109/mei.2005.1389267

Cited by 23 publications

(10 citation statements)

References 9 publications

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“…One of these layers is situated between the conductor and the insulation (inner semiconductive layer) and the other can cover the insulation itself (outer semiconducting layer). They consist of a polymeric material highly filled (up to 40 wt %) with conductive fillers, typically carbon black (CB) . The high loading of filler required however, may be detrimental to the processability, mechanical, electrical, and surface properties of the material .…”

Section: Introductionmentioning

confidence: 99%

Enhancing the electrical conductivity of carbon black/graphite nanoplatelets: Poly(ethylene‐butyl acrylate) composites by melt extrusion

Ariño

Alvarez

Rigdahl

2015

J of Applied Polymer Sci

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The influence of processing parameters such as screw geometry, temperature profile, and screw speed on the electrical properties of hybrid composites consisting of graphite nanoplatelets and carbon black in ethyl butyl acrylate was studied. Two different screws were used to compound the hybrid composites at two different temperatures and two different screw speeds. A beneficial effect was noted with regard to the electrical properties when adding nanoplatelets to the filler system. The cause could be a synergistic effect due to the difference in particle shape of the two fillers. Lower percolation thresholds were obtained with the conventional screw due to less breakage of the graphite nanoplatelets compared to the barrier screw. No significant changes of the electrical properties were observed when changing the temperature profiles or the screw speeds. Furthermore, the melt viscosity of the compounds was not appreciably affected at the rather low filler contents used here.

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Section: Introductionmentioning

confidence: 99%

Enhancing the electrical conductivity of carbon black/graphite nanoplatelets: Poly(ethylene‐butyl acrylate) composites by melt extrusion

Ariño

Alvarez

Rigdahl

2015

J of Applied Polymer Sci

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“…As shown in Figure 14a, a single hot spot develops in a single layer system, which takes place just before the SG overlap with the semiconductive shield layer and for both power frequency and l μs rise time frequency. In the case of a two-layer coating, two hot spots occur but at considerably lower temperature corresponding to both power frequency and fast rise time pulse frequencies respectively, Figures 14b and c. Semiconductive screens in cables can have different conductivity but it should be ideally not lower than 2x10 -3 S/m (500 /m) [9]. Semiconductive screens with low conductivity (>1x10 -3 S/m) can work for the same purpose that the second layer here proposed.…”

Section: Discussionmentioning

confidence: 99%

“…However, it is common practice to have conductivities well above the specification to increase the reliability of the screen [9]. In such cases, the second layer with constant or low field dependent conductivity material must be applied.…”

Section: Discussionmentioning

confidence: 99%

Stress grading materials for cable terminations under fast-rise time pulses

Espino-Cortés

Jayaram

Cherney

2006

IEEE Trans. Dielect. Electr. Insul.

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The paper discusses the material properties and designs of stress grading coatings for cable terminations that can help to reduce the adverse effects of stepped voltages present in voltage source converters. Simulations using transient and quasistatic finite element method, as well as experimental measurements of stress grading materials are presented in this study. The use of two stress grading layers in cable terminations is suggested as an alternative design to reduce the hot spot temperature in conductive stress grading coatings.

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“…The most commonly used carbon blacks used for this application are produced either with the acetylene process or with the furnace process and are described in several papers [8]. The choice of using acetylene black is based on the historical difference in cleanliness and smoothness of compounds based on acetylene black compared to old furnace blacks compounds [9].Compounds based on acetylene black are mainly chosen due to the higher impulse resistance of the cable therefore tests were carried out evaluating the influence of different parameters on this property. The model cable used in the tests described in this paper is a three-layer construction with inner and outer semiconductive screens.…”

Section: Semiconductive Screensmentioning

confidence: 99%

Evolution and future of extra high voltage cables

Wald¹

2009

2009 IEEE Electrical Insulation Conference

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The acceptance of extruded high voltage (HV) and extra high voltage cables (EHV) has increased significantly in the industry over the last 15 years. The first EHV cables in Berlin and Copenhagen were very carefully monitored and reported on in the press, but nowadays projects like this are only followed up by the experts and recording every project would be impossible. This paper will outline the improvements that have been made producing compounds for extra high voltage application including the jacketing. It will show the understanding of identifying the contaminants and reducing these in the insulation and semiconductive compounds. Today pre-qualification tests are required to produce high stress high voltage cables and extra high voltage cables. Only after this one-year test is a customer qualified to produce these cables. There are also guidelines from Cigre on what has to be tested if certain parameters in the composition of a cable have changed. We will outline the parameters that are important for a polymer producer to ensure a trouble free production of a long high voltage cables.

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The continuing evolution of semiconductor materials for power cable applications

Cited by 23 publications

References 9 publications

Enhancing the electrical conductivity of carbon black/graphite nanoplatelets: Poly(ethylene‐butyl acrylate) composites by melt extrusion

Enhancing the electrical conductivity of carbon black/graphite nanoplatelets: Poly(ethylene‐butyl acrylate) composites by melt extrusion

Stress grading materials for cable terminations under fast-rise time pulses

Evolution and future of extra high voltage cables

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