Browsing Publikasjoner fra CRIStin - SINTEF Energi by Journals "IEEE Transactions on Power Delivery"
Now showing items 1-20 of 24
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A 2D FEM Model For Impedance and Loss Calculation of Armored Three-Core Cables With Inclusion of 3D Pitching Effects
(Peer reviewed; Journal article, 2023)A method is introduced for impedance and loss calculation of three-core power cables with steel armoring, based on 2D finite element method (FEM) computations. The pitching effect of the cores and armor wires is taken into ... -
A Damping Factor-Based White-Box Transformer Model for Network Studies
(Journal article; Peer reviewed, 2018)Transformer manufacturers make routine use of white-box detailed transformer models for ensuring that the transformer will pass the lightning impulse test. For use in general simulation studies, the model should additionally ... -
Cable Modeling for Very Fast Transient Simulation Studies Using One-Sided Voltage Transfer Function Measurements
(Peer reviewed; Journal article, 2022)A novel measurement-based method for high-frequency modeling of shielded cables is introduced for use in very fast transient simulation studies. The method requires measurements on one cable end only, thereby being applicable ... -
Comparison of Different Air Flow Concepts for a Medium Voltage Load Break Switch
(Journal article; Peer reviewed, 2019)The research and development work towards a compact SF6-free load break switch for the medium voltage range has led to several design proposals. The interruption capability of three different nozzle and gas flow concepts ... -
Dominant Modes Identification of Linear Systems via Geometrical Search
(Peer reviewed; Journal article, 2020)This paper presents a novel approach, based on the theory of hyperplanes, for mode identification of linear systems. The proposed approach can operate on either a set of ordinary differential equations (converted to diagonal ... -
Experimental study on the effect of soil moisture content on critical temperature rise for typical cable backfill materials
(Peer reviewed; Journal article, 2022)The increased utilization of power grid requires operating power cables close to their thermal limit. Buried power cables in such condition experience thermal instability where thermal resistance increases as the moisture ... -
Health Index, Risk and Remaining Lifetime Estimation of Power Transformers
(Journal article; Peer reviewed, 2020)A new method for systematically estimating health index, probability of breakdown and remaining life for power transformers is presented. The method combines three basic models; a physical winding degradation model, a ... -
High-Frequency Resonant Overvoltages in Transformer Regulating Winding Caused by Ground Fault Initiation on Feeding Cable
(Journal article; Peer reviewed, 2018)Transformer terminal equivalents obtained via admittance measurements are suitable for simulating high-frequency transient interaction between the transformer and the network. This paper augments the terminal equivalent ... -
Identification and Small-Signal Analysis of Interaction Modes in VSC MTDC Systems
(Journal article; Peer reviewed, 2016)Email Print Request Permissions In this paper, a methodology is presented to identify and analyse interaction modes between converters in Voltage Source Converter Multi-Terminal High Voltage Direct Current (VSC MTDC) ... -
Inclusion of Neutral Points in Measurement-Based Frequency-Dependent Transformer Model
(Peer reviewed; Journal article, 2021)Measurement-based wide-band black-box transformer models are well suited for simulation studies of high-frequency transients in power systems. The inclusion of neutral points in such models can be difficult when the model ... -
Inclusion of Wire Twisting Effects in Cable Impedance Calculations
(Journal article; Peer reviewed, 2016)Cable-series impedance modeling is widely applied in electromagnetic transients simulations and power-loss calculations. The calculations are usually performed in a 2-D frame using the finite-element method or alternative ... -
Limitations in the application of computer simulations of temperature rise of completely new designs of MV metal enclosed switchgear
(Peer reviewed; Journal article, 2020)Temperature rise simulation deals with different physical domains describing heat generation and heat dissipation effects. Cigr working group A3.36 has conducted a study on temperature rise simulation of switchgear for ... -
Medium voltage load current interruption in presence of ablating polymer material
(Journal article; Peer reviewed, 2018) -
Multi-Conductor Cable Modeling With Inclusion of Measured Coaxial Wave Propagation Characteristics
(Peer reviewed; Journal article, 2023)The prediction of voltage stresses in transformer and machine windings requires the ability to calculate pulse propagation effects on the feeding cable with sufficient accuracy. The use of commonly available cable models ... -
Neutral Point Overvoltages in Wye-Wye Connected Distribution Transformer Caused by Lightning Current in Low-Voltage Winding
(Peer reviewed; Journal article, 2020)Lightning strokes is a main source of transformer failures in distribution systems. The discharge of a lightning current through a distribution transformer's high-voltage (HV) side arresters leads to a ground potential ... -
Optimal Time Delay Extraction for Transmission Line Modeling
(Journal article; Peer reviewed, 2016)Frequency-dependent transmission line modeling by the traveling wave method requires to approximate the propagation function with a delayed rational function. Some approaches are based on modal decomposition where scalar ... -
Passivity Enforcement by Residue Perturbation via Constrained Non-Negative Least Squares
(Peer reviewed; Journal article, 2020)Passivity is a fundamental requirement for rational models to guarantee stable behavior when included in general time domain simulations. This paper introduces a new variant of one passivity enforcement scheme that is based ... -
Rational Function Approximation of Transformer Branch Impedance Matrix For Frequency-Dependent White-Box Modeling
(Peer reviewed; Journal article, 2023)Transformer white-box models are used by the manufacturers to calculate internal winding voltages during the lightning impulse test. The model can also be applied in general network studies, but the model accuracy should ... -
Self-blast Current Interruption and Adaption to Medium Voltage Load Current Switching
(Journal article; Peer reviewed, 2019)Ablation-assisted current interruption is a candidate for improving interruption capability in medium voltage switchgear. In high voltage switchgear, ablation is utilized to achieve high pressures in self-blast circuit ... -
Simplified model for heat transport for cables in pipes
(Peer reviewed; Journal article, 2021)This paper addresses challenges with modeling of heat transfer phenomenon for cables in duct or pipes when applying a numerical solution. Heat transport mechanisms between the cable and pipe surfaces are conduction, ...