Heat Transfer Measurements On Unequally Loaded Underground Power Cables With Constant And Cyclic Currents

Bernath, A.; Olfe, Daniel B.; Ferguson, Bryan W.

doi:10.1109/tpas.1984.318276

Cited by 13 publications

(14 citation statements)

References 8 publications

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“…Based on this, derating factors due to the presence of harmonics can be defined only for a specified harmonic signature. Other methods use the temperature as base variable for loss assessment [2,3,4]. Temperature measurements, for example, lead to the determination of the maximum current a cable can withstand.…”

Section: Known Methods For Determining the Electrical Lossesmentioning

confidence: 99%

Experimental analysis of the electrical losses under nonsinusoidal conditions: Is the Fourier series really applicable?

Parentoni

Abreu

Belchior

2010

Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010

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    The objective of this paper is to evaluate experimentally the increase of electrical losses under nonsinusoidal situations. Such evaluation is done by calculating the energy dissipated in a resistor based on temperature measurement. In order to obtain a practical result, two kinds of tests are performed: one measuring the heating caused by a distorted wave of current and another for each harmonic component of the same distorted wave. The energy dissipated in the first situation is compared with the sum of the energy dissipated for each harmonic component.

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Section: Known Methods For Determining the Electrical Lossesmentioning

confidence: 99%

Experimental analysis of the electrical losses under nonsinusoidal conditions: Is the Fourier series really applicable?

Parentoni

Abreu

Belchior

2010

Proceedings of 14th International Conference on Harmonics and Quality of Power - ICHQP 2010

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“…Eight short-term transient experiments were performed at the underground power cable test site described in reference [2]. A description of these experiments including the maximum current and emergency load cycle for each cable during the tests is given in Table 1 (cables not listed continue to operate at their prescribed cyclic case loads).…”

Section: Short-term Transient Experiments At the Test Sitementioning

confidence: 99%

“…The dotted lines are the experimental conductor, jacket, and conduit temperatures for cyclic case B (pretransient conditions). Fluctuations in the cyclic jacket temperature profile are due to thermocouple sampling errors in the automated computer system at the test site (see reference[2]). TIME (HOURS) Temperatures for cable 3 during transient case B2, with separate profiles for the conductor (o), jacket (*), and conduit (x for top of conduit, + for outside of conduit away from other cables in the duct bank).…”

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confidence: 99%

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Short-Term Transient Temperature Calculations and Measurements for Underground Power Cables

Bernath

Olfe

Martin

1986

IEEE Trans. Power Delivery

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A time-dependent heat transfer model based on the complete Fourier integral was developed for calculating cable temperatures during short-term transient conditions. A cyclic heat transfer calculation is used to obtain the initial temperature-time profile of the cable before the transient loading begins. The short-term transient model uses a lumped parameter formulation for the different cable regions and the Fourier integral to approximate the transient heat loss profile. Calculated conductor, jacket, and conduit temperatures show reasonable agreement with experimental results for a number of short-term transient tests with cables in a typical duct bank arrangement.

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“…It is essential to ensure effective dissipation of this energy to avoid excessive heating of the cable that could lead to its rupture. The study of the heat dissipated from the cable in the surrounding soil has been the subject of many works [1][2][3][4][5][6][7][8][9][10]. Previous works focused on the thermal behaviour of cable backfill materials, the ampacity of cables, the effect of the installation geometry including the dimensions of the trench, cable location and diameter, the thermal properties of the surrounding soils, the seasonal variation of temperature, etc.…”

Section: Introductionmentioning

confidence: 99%

Modelling of coupled heat and moisture flows around a buried electrical cable

2016

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Abstract. The admissible current within a buried electrical power cable is limited by the maximum allowed temperature of the cable (Joule effect). The thermal properties of the surrounding soil controls heat dissipation around the cable. The main focus of the study was to evaluate the coupled heat and moisture flow around such buried electrical cables. The heat dissipation of a buried power cable was simulated in the surrounding soil at unsteady conditions. The hydro-thermal coupling was modelled by taking into account the moisture flow of liquid water and vapour, and the heat flow in the soil by convection and advection. As the thermal vapour diffusion enhancement factor () appears to be a key parameter, the sensitivity study of the coupled heat and moisture flow in the ground regarding this parameter was performed. The variations of the degree of saturation and the temperature of the surrounding soil were studied over 180 days of heating. The results showed that the moisture flow was mainly caused by the vapour transport under temperature gradients. These results emphasized the significant effect of the hydrothermal characteristics of surrounding soil. The radius of influence of the power cable was also evaluated.

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Heat Transfer Measurements On Unequally Loaded Underground Power Cables With Constant And Cyclic Currents

Cited by 13 publications

References 8 publications

Experimental analysis of the electrical losses under nonsinusoidal conditions: Is the Fourier series really applicable?

Experimental analysis of the electrical losses under nonsinusoidal conditions: Is the Fourier series really applicable?

Short-Term Transient Temperature Calculations and Measurements for Underground Power Cables

Modelling of coupled heat and moisture flows around a buried electrical cable

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