DC-field in solid dielectric cables under transient thermal conditions

Hjerrild, Jesper; Boggs, S. A.; Holbøll, Joachim; Henriksen, M.

doi:10.1109/icsd.2001.955511

Cited by 24 publications

(12 citation statements)

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“…The authors consider, in line with the proposal as in [11], a cylindrical surface in the soil, concentric with the cable and sufficiently farther from the cable surface, say about 1 m, where the soil temperature may constrained at a constant value, say 20 -30 0 C under steady state Thus, referring to Figure 1, the governing differential equation within the soil, for…”

Section: The Thermal Boundary Conditionsmentioning

confidence: 99%

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On the computation of electric field and temperature distribution in HVDC cable insulation

Reddy

Ramu

2006

IEEE Trans. Dielect. Electr. Insul.

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The paper presents certain aspects of electrical / thermal failure of dc power cables. Closed form theoretical formulations for computing the critical stress and temperature due to an external heat source in the form of a steady current through the conductor is presented. The criticality here implies an unstable state of the dielectric and is shown, more often than not, to be different, from that corresponding to thermal decomposition limits. Formulation and solution of continuity equations under first and second kind boundary conditions taking account of electric stress and temperature-dependent dc conductivity is covered. Using the suggested model, stress and temperature distribution in the body of the insulation can be obtained to a reasonable degree of accuracy.Index Termsdc cable, thermal breakdown, critical stress, critical temperature, stress distribution, temperature distribution, thermal instability.

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Section: The Thermal Boundary Conditionsmentioning

confidence: 99%

“…There have been suggestions [4,11,12,13] that, for polymeric materials in particular, a similar expression, with a presumably physical concoction be used as under:…”

Section: Electrical Conductivitymentioning

confidence: 99%

On the computation of electric field and temperature distribution in HVDC cable insulation

Reddy

Ramu

2006

IEEE Trans. Dielect. Electr. Insul.

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“…Interestingly, it has been observed that a runaway can occur at a temperature, just a few degrees above the boundary temperature [1][2][3].…”

Section: Computation Of Mtv Of a DC Cablementioning

confidence: 99%

“…An important aspect of these equations is their close relation with the thermal maximum voltage given in [1][2][3] for one dimensional geometry. The first term in the right hand side of these two equations can be seen to be formally similar with the thermal maximum voltage with one of the boundaries thermally sealed ( ) (39) is a significant result in that, the maximum thermal voltage of the cable is not a constant but is a function of Load current.…”

Section: The Cylindrical Geometrymentioning

confidence: 99%

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Estimation of thermal breakdown voltage of HVDC cables - A theoretical framework

Reddy

Ramu

2007

IEEE Trans. Dielect. Electr. Insul.

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The insulation in a dc cable is subjected to both thermal and electric stress at the same time. While the electric stress is generic to the cable, the temperature rise in the insulation is, by and large, due to the Ohmic losses in the conductor. The consequence of this synergic effect is to reduce the maximum operating voltage and causes a premature failure of the cable. The authors examine this subject in some detail and propose a comprehensive theoretical formulation relating the maximum thermal voltage (MTV) to the physical and geometrical parameters of the insulation. The heat flow patterns and boundary conditions considered by the authors here and those found in earlier literature are provided. The MTV of a dc cable is shown to be a function of the load current apart from the resistance of the insulation. The results obtained using the expressions, developed by the authors, are compared with relevant results published in the literature and found to be in close conformity.Index Terms -Maximum thermal voltage, thick slab, dc cable, breakdown, insulation, heat flow patterns, external heat injection.

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Failure of submarine cables used in high‐voltage power transmission: Characteristics, mechanisms, key issues and prospects

Wang

Yan

et al. 2021

IET Generation Trans & Dist

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This study reviews the failure of high-voltage submarine cables used in offshore power transmission and provides highlights of their failure characteristic, mechanisms, key issues and prospects. High-voltage submarine cables are designed and applied according to the high-voltage alternating current and high-voltage direct current requirements. Inevitably, the fault occurs in HV submarine cables that is different from that of an underground cable. External aggression remains the primary cause of faults, such as fishing and anchors. Most faults continue to occur at a shallow depth (300 m). The optical fiber inside the submarine cables plays a substantial role in the temperature and stress-strain monitoring and diagnosis. However, it is regarded as a weak point for electrical fault. Insulation breakdown is the leading reason for the short fault. The failure mechanism is complicated when associated with marine conditions. Some defects of insulation and extensive voids, water treeing, mechanical stress, partial discharges, overheating, and electrochemical erosion contribute to the insulation breakdown. Several key issues, including anchoring damage, treeing, defects, and thermal-electric ageing, are proposed. Prospects and new methods related to the cable failure, especially for insulation ageing by treeing and electrothermal effects, are also discussed. INTRODUCTIONSubmarine cables are widely used for new energy power systems in marine environments, such as offshore wind, wave, and solar power transmission applications, and as a power supply to remote areas [1-2]. High-voltage alternating current (HVAC) and high-voltage direct current (HVDC) are the main types of power transmissions by submarine cables [1,3]. Currently, submarine cables with long distances and high voltage carry high electric power between countries and offshore installations, such as oil/gas platforms and offshore wind farms [4][5][6]. Three-core submarine cable or three single submarine cables are employed for HVAC transmission. HVAC technology is simple and has high availability, but it lacks power control and requires reactive compensation [3,7]. Besides, it has a limited distance for high power transmission with high effi-This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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DC-field in solid dielectric cables under transient thermal conditions

Cited by 24 publications

References 1 publication

On the computation of electric field and temperature distribution in HVDC cable insulation

On the computation of electric field and temperature distribution in HVDC cable insulation

Estimation of thermal breakdown voltage of HVDC cables - A theoretical framework

Failure of submarine cables used in high‐voltage power transmission: Characteristics, mechanisms, key issues and prospects

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