The breakdown of cables by thermal instability

Brazier, L.G.

doi:10.1049/jiee-1.1935.0128

Cited by 9 publications

(3 citation statements)

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“…This problem was extensively studied in the past, starting long ago from the "intrinsic" thermal instability-i.e., associated with cable layers only-of thick plane insulations with constant boundary temperature [165,166], and from the "interactive" thermal instability-i.e., due to thermal interaction of the cable with the outer environment in [167,168]. Intrinsic instability of HVDC cables was first studied by Eoll in [74], and later on e.g., in [46,72].…”

Section: Thermal Stabilitymentioning

confidence: 99%

Issues and Challenges for HVDC Extruded Cable Systems

Mazzanti

2021

Energies

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The improved features of AC/DC converters, the need to enhance cross-country interconnections, the will to make massive remote renewable energy sources available, and the fear of populations about overhead lines have fostered HVDC cable transmission all over the world, leading in the last two decades to an exponential increase of commissioned HVDC cable projects, particularly of the extruded insulation type. Comprehensive surveys of the issues to be faced by HVDC extruded cable systems appeared in the literature some years ago, but they are not so up-to-date, as HVDC extruded cable technology is developing fast. Therefore, the contribution this paper aims at giving is a systematic, comprehensive and updated summary of the main present and future issues and challenges that HVDC cable systems have to face to further improve their performance and competitiveness, so as to meet the growing quest for clean and available energy worldwide. The topics covered in this review–treated in alphabetical order for the reader’s convenience–are accessories, higher voltage and power, laying environment (submarine and underground cables), modeling, multiterminal HVDC, operation and diagnostics, recyclable insulation, space charge behavior, testing, thermal stability, transient voltages.

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Section: Thermal Stabilitymentioning

confidence: 99%

Issues and Challenges for HVDC Extruded Cable Systems

Mazzanti

2021

Energies

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“…The second case of thermal instability refers to the so-called "unstable equilibrium" in which an Thermal instability occurs when thermal equilibrium cannot be achieved. A stable thermal equilibrium is reached only when the total heat of both conductor and insulation losses is equal to the heat dissipated from the cable [8]. This condition is shown in Figure 4 by point (A), the first intersection between the generation curve and the dissipation line.…”

mentioning

confidence: 94%

“…Whitehead found that intrinsic thermal instability occurs at a critical temperature rise (due to only insulation losses) as low as 10 • C [4]. Fallou [7], Brazier [8] and Jeroense and Morshuis [9] studied the so-called "interactive" thermal instability of cables, which occurs in the presence of thermal interaction of the cable with the outer environment. The authors in [9] studied the interactive thermal instability of 450 kV paper-insulated cable and found that the insulation losses become significant for sheath temperatures >70 • C, and interactive…”

Section: Introductionmentioning

confidence: 99%

The Effect of Insulation Characteristics on Thermal Instability in HVDC Extruded Cables

Diban

Mazzanti

2021

Energies

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This paper aims at studying the effect of cable characteristics on the thermal instability of 320 kV and 500 kV Cross-Linked Polyethylene XLPE-insulated high voltage direct-current (HVDC) cables buried in soil for different values of the applied voltages, by the means of sensitivity analysis of the insulation losses to the electrical conductivity coefficients of temperature and electric field, a and b. It also finds the value of dielectric loss coefficient βd for DC cables, which allows an analytical calculation of the temperature rise as a function of insulation losses and thermal resistances. A Matlab code is used to iteratively solve Maxwell’s equations and find the electric field distribution, the insulation losses and the temperature rise inside the insulation due to insulation losses of the cable subjected to load cycles according to CIGRÉ Technical Brochure 496. Thermal stability diagrams are found to study the thermal instability and its relationship with the cable ampacity. The results show high dependency of the thermal stability on the electrical conductivity of cable insulating material, as expressed via the conductivity coefficients of temperature and electric field. The effect of insulation thickness on both the insulation losses and the thermal stability is also investigated.

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The gas-impregnated cable

Arman¹

1937

Journal of the Institution of Electrical Engineers

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The breakdown of cables by thermal instability

Cited by 9 publications

References 0 publications

Issues and Challenges for HVDC Extruded Cable Systems

Issues and Challenges for HVDC Extruded Cable Systems

The Effect of Insulation Characteristics on Thermal Instability in HVDC Extruded Cables

The gas-impregnated cable

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