Faults Evaluation of MV Underground Cable Joints

Calcara, Luigi; D'Orazio, L.; Corte, Maurizio Della; Filippo, Guglielmo Di; Pastore, Alessio; Ricci, Davide; Pompili, M.

doi:10.23919/aeit.2019.8893351

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…This aspect may lead to further degradation of cable reliability. High local electrical fields may cause deterioration of the power cable, especially in the joints when imperfections are introduced during the joint construction [99]. In this case, partial discharges could occur, and the defect could be exacerbated, in particular at high temperatures [100].…”

Section: Reliability Aspectsmentioning

confidence: 99%

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

et al. 2021

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With the increase in the electrical load and the progressive introduction of power generation from intermittent renewable energy sources, the power line operating conditions are approaching the thermal limits. The definition of thermal limits variable in time has been addressed under the concept of dynamic thermal rating (DTR), with which it is possible to provide a more detailed assessment of the line rating and exploit the electrical system more flexibly. Most of the literature on DTR has addressed overhead lines exposed to different weather conditions. The interest in the dynamic thermal rating of power cables is increasing, considering the evolution of computational methods and advanced systems for cable monitoring. This paper contains an overview of the concepts and methods referring to dynamic cable rating (DCR). Starting from the analytical formulations developed many years ago for determining the power cable rating in steady-state conditions, also reported in International Standards, this paper considers the improvements of these formulations proposed during the years. These improvements are leading to include more specific details in the models used for DCR analysis and the computational methods used to assess the power cable’s thermal conditions buried in soil. This paper is focused on highlighting the path from the initial theories and models to the latest literature contributions. Attention is paid to thermal modelling with different levels of detail, applications of 2D and 3D solvers and simplified models, and their validation based on experimental measurements. A salient point of the overview is considering the DCR impact on reliability aspects, risk estimation, real-time calculations, forecasting, and planning with different time horizons.

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Section: Reliability Aspectsmentioning

confidence: 99%

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

et al. 2021

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“…It is uncertain how much the environmental temperature effects the process of degradation of the cable termination in conditions of high supraharmonic distortion [4]. However, studies [28] have demonstrated increased failures of underground cable accessories (cable joints) during summer periods. This might affect electrical systems especially in countries where high temperatures happen during these periods.…”

Section: E Environmental Temperaturementioning

confidence: 99%

“…The extension of this work to cable joints is of interest, as the number of failure of cable joints might be higher than those of cable terminations in some countries [28]. Association of these failure cases with supraharmonics require the study of the methods of field control in cable joints susceptible to nonrated frequency conditions.…”

Section: F Applicability To Other Cable Accessoriesmentioning

confidence: 99%

Failure of MV Cable Terminations Due to Supraharmonic Voltages: A Risk Indicator

Espín-Delgado

Letha²,

Rönnberg³

et al. 2020

IEEE Open J. Ind. Applicat.

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This paper addresses the accelerated aging of medium-voltage (MV) cable terminations with resistive stress-grading due to supraharmonics. The paper introduces a simple and quick way to relate the risk of cable termination failure to the characteristics of supraharmonic distortion in the system. The motivation is to give practical recommendations and guidelines to evaluate the risk of failure of cable terminations under the presence of supraharmonics in MV networks. The underlying model relates the heating in the cable termination linearly with the frequency of the voltage applied and proportionally with the square of the magnitude of the voltage. The indicator can be used to decide whether given levels and frequencies of supraharmonics in the MV network represent a risk to cable terminations. The parameters of the cable termination design are not needed for that decision. However, the decision criterion is based on one sample data (Eagle Pass) and more field information is crucial to improve the approach. INDEX TERMS Dielectric breakdown, dielectric losses, power cable insulation, power quality, power system harmonics, supraharmonics.

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“…Even if ITs are not the most critical asset of the grid, such as cable joints [ 4 , 5 , 6 ] and insulators may be [ 7 , 8 , 9 ], studies on them are always clear and current. As a matter of fact, the IT is a key element that provides information on what is happening to the power network in every single instant.…”

Section: Introductionmentioning

confidence: 99%

Smart Characterization of Rogowski Coils by Using a Synthetized Signal

Mingotti

Peretto

Tinarelli

2020

Sensors

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With the spread of new Low-Power Instrument Transformers (LPITs), it is fundamental to provide models and characterization procedures to estimate and even predict the LPITs’ behavior. In fact, distribution system operators and designers of network models are looking for all forms of information which may help the management and the control of power networks. For this purpose, the paper wants to contribute to the scientific community presenting a smart characterization procedure which easily provides sufficient information to predict the output signal of a Low-Power Current Transformer (LPCT), the Rogowski coil. The presented procedure is based on a synthetized signal applied to the Rogowski coil. Afterwards, the validity of the procedure is assessed within the Matlab environment and then by applying it on three off-the-shelf Rogowski coils. Simulations and experimental tests and results involving a variety of distorted signals in the power quality frequency range and by adopting a quite simple measurement setup demonstrated the effectiveness and the capability of the procedure to correctly estimate the output of the tested device.

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Faults Evaluation of MV Underground Cable Joints

Cited by 11 publications

References 13 publications

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables

Failure of MV Cable Terminations Due to Supraharmonic Voltages: A Risk Indicator

Smart Characterization of Rogowski Coils by Using a Synthetized Signal

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