Abstract
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 steady-state 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.
Highlights
High Voltage Direct Current (HVDC) systems constitute already an important pillar of electric power grids, and their presence is expected to grow massively in the future
This paper focuses on HVDC cables, generally employed for long distance power transmission
The focus of the work presented in the following is, to include the polarization dynamic, that is, a time dependence of permittivity, in the electric field modelling, and show how it can impact on the simulation accuracy of electric field transients
Summary
High Voltage Direct Current (HVDC) systems constitute already an important pillar of electric power grids, and their presence is expected to grow massively in the future. INDEX TERMS HVDC cables, electrical insulation, dielectric polarization, electric field transient. In order to infer intrinsic and extrinsic accelerated aging mechanism [8], accurate simulation of electric field inside insulation, both in steady state and transient conditions, is necessary.
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