Generic Field Simulation Framework for HVDC Cables

Frobin, Saskia Josefine; Freye, Claudius; Niedik, Christoph Felix; Jenau, Frank

doi:10.1109/icd.2018.8470038

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…To perform the simulations, a homogeneous cylindrical insulation layer is considered. The thermal and electrical properties of the implemented insulation material are parametrized in Table 2, while the thermal properties are taken from [9,10]…”

Section: Modeling and Simulationmentioning

confidence: 99%

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Investigating Conditions for an Unexpected Additional Source of Partial Discharges in DC Cables: Load Power Variations

Naderiallaf

Seri

Montanari

2021

IEEE Trans. Power Delivery

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This paper has the purpose to investigate the variation of electric field inside a HVDC cable insulation, and consequent potentiality of partial discharge inception in a defect upon load current variation. Simulations carried out by COMSOL Multiphysics show that load variations can incept partial discharges during cable operation at a constant voltage, depending on insulating material characteristics, defect size and location, and, in particular, the temperature and field dependence of electrical conductivity. Different values for temperature and field dependency of electrical conductivity, as well as of thermal conductivity and heat capacity are considered and their effect on the field distribution inside cavities near inner and outer semiconducting layer analyzed. For this purpose, a new analytical model to predict the behavior of PD amplitude and repetition rate from cable energization to steady state, including load variation, is introduced. The likelihood of PD inception during load transients, and not only voltage transients as previously demonstrated, poses further attention and constraints to HVDC cable design.

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Section: Modeling and Simulationmentioning

confidence: 99%

“…Boundary conditions for thermal and electrical simulations, are parametrized in Table 3 [9], assuming that the HVDC cable is surrounded by air and there is only convection heat transfer, while surface to ambient radiation (surface emissivity) in all directions is set to zero.…”

Section: B Thermal Modelingmentioning

confidence: 99%

Investigating Conditions for an Unexpected Additional Source of Partial Discharges in DC Cables: Load Power Variations

Naderiallaf

Seri

Montanari

2021

IEEE Trans. Power Delivery

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“…Boundary conditions for thermal and electrical simulations, are parametrized in Table III [3,24], assuming that the HVDC cable is surrounded by air and there is only convection heat transfer, while surface to ambient radiation (surface emissivity) in all directions is set to zero.…”

Section: A Modeling and Simulationmentioning

confidence: 99%

Designing a HVDC Insulation System to Endure Electrical and Thermal Stresses Under Operation. Part I: Partial Discharge Magnitude and Repetition Rate During Transients and in DC Steady State

2021

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This paper has the purpose to investigate HVDC insulation design considering real operating conditions, when DC steady-state is affected by frequent voltage transients or load variations that may be present during all life. Electrical field distribution in insulation, and in insulation defects, may change significantly from DC steady-state when voltage and load vary with time, which can cause partial discharge activity often not been properly accounted for at the design stage. The Part I of this paper is dedicated to prove, through experiments, models and simulations, that electrical and thermal transients may incept partial discharges in defective insulations during cable energization, voltage polarity inversion at a constant nominal load, as well as during load variations at a constant nominal voltage. This can cause accelerated aging and premature breakdown even if the insulation system is designed properly to withstand DC electrothermal stress, without partial discharges in steady state, for all life, as it will be shown in Part II. Focus is on cables, but the approach described here is general for any DC insulation system. INDEX TERMS Cable insulation, DC, voltage and load transients, design methodology, finite element analysis, partial discharges. Hadi Naderiallaf was born in Mashhad, Iran, on April 16th, 1986. He received the M.Sc. degree in electrical engineering in 2012 from the Leibniz Universität Hannover, Germany. He did his master thesis at the Schering Institute of High Voltage Techniques and Engineering in the Leibniz Universität Hannover. He has working experience for five years as a transformer fluid specialist. From November 2017, he has been a PhD student in the University of Bologna in Italy working on the EU project GRIDABLE. His main research interests are liquid and nanostructured solid electrical insulating materials, HVDC cables design, space charge measurement and analysis, AC and DC partial discharge detection and modelling, insulation systems for electrical machines, condition monitoring techniques, HV transformer asset management, DGA and transformer oil reclamation. Paolo Seri (M'17) was born in Macerata, Italy, on June 4th 1986. He received the M.Sc. degree in energy engineering in 2012 and PhD in electrical engineering in 2016, both from the University of Bologna. From 2017 he is part of the Laboratory of Innovative Materials for Electrical Systems (LIMES) of the University of Bologna as a research fellow, currently working on the topics of HVDC cables design, partial discharge detection and modelling, and characterization of dielectric materials. He is also

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“…Traditional electric field simulation approaches [2,10,11] are based on the following quasi-electrostatic model:…”

Section: Introductionmentioning

confidence: 99%

Charging and Discharging Current Measurements and Impact of Polarization Dynamics on Electric Field Modeling in HVDC Paper-Insulated Cables

et al. 2021

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Accurate modeling and simulation of electric field transients in HVDC cables is an important support to optimize insulation system design and to evaluate the influence of voltage transients and steadystate conditions on accelerated ageing mechanisms and insulation reliability. Traditionally, field models considering time-independent permittivity and conductivity are used, but this approach neglects polarization mechanisms and charge trapping-detrapping phenomena. This article includes polarization dynamics in the field model and shows that its impact on transient electric field simulations in HVDC paper-insulated cables can be significant. A method is presented to infer the model parameters from experimental polarization and depolarization current measurements. INDEX TERMS HVDC cables, electrical insulation, dielectric polarization, electric field transient.

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Generic Field Simulation Framework for HVDC Cables

Cited by 7 publications

References 10 publications

Investigating Conditions for an Unexpected Additional Source of Partial Discharges in DC Cables: Load Power Variations

Investigating Conditions for an Unexpected Additional Source of Partial Discharges in DC Cables: Load Power Variations

Designing a HVDC Insulation System to Endure Electrical and Thermal Stresses Under Operation. Part I: Partial Discharge Magnitude and Repetition Rate During Transients and in DC Steady State

Charging and Discharging Current Measurements and Impact of Polarization Dynamics on Electric Field Modeling in HVDC Paper-Insulated Cables

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