Research on Nonlinear EPDM for ±525kV HVDC Cable Accessories

Liu, Dong; Zhu, Zhien; Yang, Liming; Ma, Yong

doi:10.1051/matecconf/201926002001

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…In-situ modification of particles improves the performance of composite materials better than other modification methods [8,9] , so two silane coupling agents , as shown in Figure 3, were selected to improve the combination of nanoparticles and silicone rubber matrix, enhance the interface, so that the particles are easier to disperse in the matrix and improve the properties. The two silane coupling agents were used to modify two nanoparticles (Al2O3 and MgO) in situ, and then the modified nanoparticles were added to silicone rubber to prepare composite materials and study the properties of composite materials.…”

Section: Nanoparticle-mgo Modificationmentioning

confidence: 99%

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

Qiao,

Yan,

et al. 2024

Fifth International Conference on Optoelectronic Science and Materials (ICOSM 2023)

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The present paper reports about the effect of nano-filler on the performance of insulating materials in high voltage cable system applications. The influence of the processing method and content of nano-filler was studied. It was demonstrated that the choice of the right processing method is crucial for obtaining end products with desired properties, because of better filler dispersion. Composites with MgO nanofiller modified by in-situ modification and dispersion by high-speed stirring has better mechanical and electrical performance for cable system.

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Section: Nanoparticle-mgo Modificationmentioning

confidence: 99%

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

Qiao,

Yan,

et al. 2024

Fifth International Conference on Optoelectronic Science and Materials (ICOSM 2023)

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“…Li et al [16] reported on quasi field-independent conductivity of EPDM for fields up to 10 to 20 kV/mm that contrasted with the strong field dependence of conductivity of XLPE. Besides, EPDM is a complex material, and its behaviour may change with compounding: D. Li et al [17] found power law relation between conductivity and field with an exponent in the range from 0.2 to 0.9, depending on EPDM grade (with using only 1 min charging time!). The conductivity of SiR exhibits weak field dependence and relatively mild temperature dependence.…”

Section: σ(T Ementioning

confidence: 99%

Electric Field Distribution in HVDC Cable Joint in Non-Stationary Conditions

Teyssèdre

Roy

2021

Energies

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Accessories such as joints and terminations represent weak points in HVDC cable systems. The DC field distribution is intimately dependent on the thermal conditions of the accessory and on material properties. Moreover, there is no available method to probe charge distribution in these conditions. In this work, the field distribution in non-stationary conditions, both thermally and electrically, is computed considering crosslinked polyethylene (XLPE) as cable insulation and different insulating materials (silicone, rubber, XLPE) for a 200 kV joint assembled in a same geometry. In the conditions used, i.e., temperatures up to 70 °C, and with the material properties considered, the dielectric time constant appears of the same order or longer than the thermal one and is of several hours. This indicates that both physical phenomena need to be considered for modelling the electric field distribution. Both the radial and the tangential field distributions are analysed, and focus is given on the field distribution under the stress cone on the ground side and near the central deflector on the high voltage side of the joint. We show that the position of the maximum field varies in time in a way that is not easy to anticipate. Under the cone, the smallest tangential field is obtained with the joint insulating material having the highest electrical conductivity. This results from a shift of the field towards the cable insulation in which the geometrical features produce a weaker axial component of the field. At the level of the central deflector, it is clear that the tangential field is higher when the mismatch between the conductivity of the two insulations is larger. In addition, the field grows as a function of time under stress. This work shows the need of precise data on materials conductivity and the need of probing field distribution in 3D.

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“…Power cable accessories are an important part of the cable system [1]. It is found that the failure rate of cable accessories is much higher than that of cable body.…”

Section: Introductionmentioning

confidence: 99%

Influence of plasticizers on the properties of insulating material for high voltage DC cable system

Qiao,

Yan,

yan

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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The present paper reports about the effect of plasticizers on the performance of Ethylene-Propylene-Diene Monomer (EPDM) in high voltage DC cable system applications. The influence of the chemical structure and content of oil was studied. It was demonstrated that the choice of the right plasticizers is crucial for obtaining end products with desired properties. These products must meet not only the processing requirements but also mechanical and electrical performance demands. Two types of plasticizers have been researched for EPDM/silica compounds, and it concluded that paraffin oil is selected for EPDM composite with less than 30 phr silica filler. While, naphthenic oil is suggested for EPDM composite with 30phr silica filler or more to achieve high DC breakdown voltage, because of better compatibility with EPDM rubber.

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Research on Nonlinear EPDM for ±525kV HVDC Cable Accessories

Cited by 4 publications

References 7 publications

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

MgO nanoparticles on the electrical properties of insulating materials for high voltage cable system

Electric Field Distribution in HVDC Cable Joint in Non-Stationary Conditions

Influence of plasticizers on the properties of insulating material for high voltage DC cable system

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