Electric Field Calculation During Voltage Transients in HVDC Cables: Contribution of Polarization Processes

The simulation of electric field transients in HVDC cables can be a fundamental tool to support insulation system design when operation dynamics, which includes voltage polarity inversions and load variation, becomes significant during the expected cable life. The field behavior during voltage and t...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2022-12, Vol.37 (6), p.5425-5432
Main Authors: Cambareri, Pasquale, de Falco, Carlo, Rienzo, Luca Di, Seri, Paolo, Montanari, Gian Carlo
Format: Article
Language:English
Subjects:
Cable insulation
cable insulation aging
Cables
Current measurement
Dielectric polarization
Electric cables
Electric fields
Electrical surges
Equivalent circuits
HVDC insulation
Insulation
Integrated circuit modeling
Inversions
Load fluctuation
Mathematical models
Numerical models
Simulation
Systems design
Temperature dependence
Transient analysis
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Summary:The simulation of electric field transients in HVDC cables can be a fundamental tool to support insulation system design when operation dynamics, which includes voltage polarity inversions and load variation, becomes significant during the expected cable life. The field behavior during voltage and temperature transients is associated with intrinsic and extrinsic ageing processes that can affect the cable design life. Traditional models employed for electric field simulations consider only the non-linear, steady-state dependence of conductivity on temperature and field magnitude, but they neglect the transient behavior of permittivity and conductivity, that is, polarization and charge trapping phenomena. These processes impact on the duration of the field transient and thus ageing. This paper discusses the numerical implementation of an electro-quasistatic model that can be used to perform transient simulations of electric fields in HVDC cables insulation. With respect to the model traditionally employed, the presented one is extended with Debye's equations for dielectric polarization processes. The model is implemented numerically using finite differences, or the Occhini equivalent circuit: this paper demonstrates that the two approaches are equivalent. Numerical simulations show that, during transients, polarization processes slow down the electric field dynamics and reduce its maximum intensity.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2022.3177567