Thermal modeling of medium voltage cable terminations under square pulses

Shaker, Yomna; El-Hag, Ayman H.; Patel, Utkarsh R.; Jayaram, S.

doi:10.1109/tdei.2014.6832234

Cited by 23 publications

(17 citation statements)

References 10 publications

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“…As explained in [13]- [15], the temperature distribution on the stress-grading layer of cable termination can be calculated using the heat equation. In [13], [14], alternative expressions of the heat equation are used for specific purposes where the equation is solved using finite element methods to account for the complexity of the geometry and dynamics of the problem.…”

Section: Relationship Between the Power Losses And The Hotspot Temmentioning

confidence: 99%

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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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Section: Relationship Between the Power Losses And The Hotspot Temmentioning

confidence: 99%

“…This finding simplifies experimental setups and analysis. In [14] and [15], the modeling of the generated heat in the material due to power losses is studied. High levels of a 710 Hz component were measured in an MV installation, and a cable termination with resistive stress-grading failed though not immediately.…”

Section: Introductionmentioning

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.

View full text Add to dashboard Cite

show abstract

“…Figure 7 shows that the cable joint has a larger surface area than the cable body, which makes the cable joint have the stronger heat dissipation capacity, hence the maximum surface temperature It can be seen from Figure 6 that the electromagnetic losses distribution in the conductor is irregular, as the electromagnetic losses of the outer surface is greater than on the inner side. That effect is because of the skin effect which causes the current density to mainly focus on the conductor surface, which can be also seen from Equation (11). Since the equivalent conductivity of the cable body surface is higher than that of the cable joint, the skin effect for the cable joint is less sensitive, which causes the electromagnetic losses of the cable joint to increase.…”

Section: Example Calculationmentioning

confidence: 99%

“…Explosions of cable joints happen due to internal defects that cause changes in the physical fields of cable joints, including electromagnetic fields [4,5], temperature fields [6,7] and stress fields [8][9][10]. Therefore, in order to protect the cable joints and avoid cable joint accidents, especially explosions, it is important to analyze the electromagnetic-thermal-mechanical characteristics of cable joints under internal defect conditions and find methods to evaluate the internal defects of cable joints [11].…”

Section: Introductionmentioning

confidence: 99%

The Coupling Fields Characteristics of Cable Joints and Application in the Evaluation of Crimping Process Defects

Yang

Cheng³

et al. 2016

Energies

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Abstract:The internal defects of cable joints always accelerate the deterioration of insulation, until finally accidents can arise due to the explosion of the joints. The formation process of this damage often involves changes in the electromagnetic, temperature and stress distribution of the cable joint, therefore, it is necessary to analyze the electromagnetic-thermal-mechanical distribution of cable joints. Aiming at solving this problem, the paper sets up a 3-D electromagnetic-thermal-mechanical coupling model of cable joints under crimping process defects. Based on the model, the electromagnetic losses distribution, temperature distribution and stress distribution of a cable joint and body are calculated. Then, the coupling fields characteristics in different contact coefficient k, ambient temperature T amb and load current I were analyzed, and according to the thermal-mechanical characteristics of a cable joint under internal defects, the temperature difference ∆T f and stress difference ∆σ f of cable surface are applied to evaluate the internal cable joint defects. Finally, a simplified model of the cable joint is set up to verify the accuracy of the coupling field model proposed in this paper, which indicates that the model can be used to analyze the coupling fields characteristics of cable joints and the method can be applied to evaluate crimping process defects of cable joints.

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“…Unqualified construction and external destruction are the main issues in internal defects of power cable joints. The statistics show that more than 70% of defects occurred in cable joints during the past decade [1]. Internal defects of power cables will cause an increase of electromagnetic loss, insulation aging, and surface temperature changes.…”

Section: Introductionmentioning

confidence: 99%

A Thermal Probability Density–Based Method to Detect the Internal Defects of Power Cable Joints

Zhang

LuoYang

et al. 2018

Energies

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Internal defects inside power cable joints due to unqualified construction is the main issue of power cable failures, hence in this paper a method based on thermal probability density function to detect the internal defects of power cable joints is presented. First, the model to calculate the thermal distribution of power cable joints is set up and the thermal distribution is calculated. Then a thermal probability density (TPD)-based method that gives the statistics of isothermal points is presented. The TPD characteristics of normal power cable joints and those with internal defects, including insulation eccentricity and unqualified connection of conductors, are analyzed. The results indicate that TPD differs with the internal state of cable joints. Finally, experiments were conducted in which surface thermal distribution was measured by FLIR SC7000, and the corresponding TPDs are discussed.

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Thermal modeling of medium voltage cable terminations under square pulses

Cited by 23 publications

References 10 publications

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

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

The Coupling Fields Characteristics of Cable Joints and Application in the Evaluation of Crimping Process Defects

A Thermal Probability Density–Based Method to Detect the Internal Defects of Power Cable Joints

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