Impacts of temperature on the distribution of electric-field in HVDC cable joint

Qin, Yanjun; Shang, Nanqiang; Chi, Minghe; Wang, Xinyu

doi:10.1109/icpadm.2015.7295249

Cited by 20 publications

(4 citation statements)

References 5 publications

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“…The conductivity of SiR exhibits weak field dependence and relatively mild temperature dependence. Another expression proposed by Qin et al [18] follows the same trend.…”

Section: σ(T Ementioning

confidence: 53%

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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“…The conductivity of SiR exhibits weak field dependence and relatively mild temperature dependence. Another expression proposed by Qin et al [18] follows the same trend.…”

Section: σ(T Ementioning

confidence: 53%

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

Teyssèdre

Roy

2021

Energies

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“…When the cable joint is operating with load, the core heating causes the temperature difference between the core and the outer conducting shield. 15 To investigate the impact of the temperature field on the transport process of the space charge in the cable joint, the ideal condition is set, that is, the temperature T is a constant of 310 K, regardless of the coupling of the temperature field and the thermal field. The space charge and electric field modulus at the interface of the cable joint are investigated respectively.…”

Section: The Effect Of Temperature Fieldmentioning

confidence: 99%

“…Qin et al investigated the electric field distribution in cable joints under different thermoelectric conditions. 15 Hou et al calculated the electric field distribution of cable joint with nonlinear silicone rubber as reinforced insulation. 4 Bodega et al studied the space charge and DC electric field characteristics of medium voltage sized cable joint.…”

Section: Introductionmentioning

confidence: 99%

Study on space charge accumulation characteristics of 320 kV cross-linked polyethylene cable joints

Liu,

Cai,

Zhang

2023

Polymers and Polymer Composites

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High-Voltage Direct Current (HVDC) cable accessories are the key equipment to connect HVDC cables, and also the weak link in the cable system. In order to investigate the transport characteristics of space charge in cable joints, a two-dimensional axisymmetric cable joint model was established using the bipolar charge transport model, and its space charge and electric field distribution were analyzed through numerical simulation. Furthermore, the effects of the trap depth based on molecular chain displacement and temperature field on interface charge distribution of cable joint were compared with the basic model, respectively. The results show that the stress cone root and the top of the high-voltage shield are easy to accumulate space charges, which will lead to electric field distortion. The trap depth based on molecular chain displacement is larger than that of basic model at the insulation interface, which hinders the charge transport. The model without considering the effect of temperature field accumulates less charge, and the electric field and space charge at the stress cone root and the top of the high-voltage shield change gently with time. The above research results can provide a reference for the design and optimization of cable joints.

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“…For field lower than the threshold for charge injection (≈ 18 kV/mm), the reported temperature coefficients are αT = 0.04 and 0.086 K -1 for SiR and EPDM respectively and the field coefficients are βE = -1.4 × 10 −7 and 1.1 × 10 −7 m/V. Qin et al [33] also used an expression as (18) with βE =5.43 × 10 −8 m/V (a = 1) providing a mild field dependence of the ) Field (kV/mm) conductivity in SiR. However, the activation energy is 0.72 eV, which is relatively large.…”

Section: Field Distribution In Multi-dielectricsmentioning

confidence: 99%

Insulating Materials for HVDC Cable Accessories: Effects on the Electric Field in Nonstationary Situations

Teyssèdre¹,

Roy³

2022

IEEE Electr. Insul. Mag.

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With the move to DC technologies for power transmission, the computation of the field distribution in insulations has become a tricky task as the materials response is less well mastered as under ac stress. This is true for HVDC cables where essentially the conductivity law must be identified for the used insulating material. Cables represent a relatively simple case study. Accessories as cable joints and terminations are certainly more delicate to address. First, more than one material has to be handled; second the translational symmetry is broken, and tangential fields have to be computed in a situation of inhomogeneous temperature conditions. Finally, non-stationary situations have to be managed and modelled for accounting for on-line operations as well as surges seen by cables. Our purpose in this work is to give an overview on how far these transient phenomena are handled in the literature and to demonstrate how far the electrical as well as thermal properties of materials actually determine the field distributions.

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Impacts of temperature on the distribution of electric-field in HVDC cable joint

Cited by 20 publications

References 5 publications

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

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

Study on space charge accumulation characteristics of 320 kV cross-linked polyethylene cable joints

Insulating Materials for HVDC Cable Accessories: Effects on the Electric Field in Nonstationary Situations

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