The Temperature Rise of Buried Cables and Pipes

Neher, Jack

doi:10.1109/t-aiee.1949.5059897

Cited by 60 publications

(24 citation statements)

References 9 publications

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“…4;r p= q effect of that moisture movement on the heat source. It is reported that laboratory and field tests consistently provide differing results for the resistivity of soil [7].…”

Section: Equationmentioning

confidence: 99%

“…The first is movement in liquid form due to heat weakening surface tension between water and soil particles, and the second mechanism is due to vapor movement through the soil [10] [11]. Movement of moisture in the liquid state has been found to be a minor effect in the temperature change of cables [7] [12]. For this reason only the second mechanism, the movement of vapor through the soil, will be considered as an effective enough mechanism to produce the type of drying seen in soils surrounding cables.…”

Section: The Mechanism Of Heat Transfer Through Soilmentioning

confidence: 99%

“…Equation 32 is known as the short form of the Kennelly equation and is a valid approximation for cases where z is more the 1.5 times the cable diameter [7]. shows that they are identical if the depth of burial of the horizontal cable z is equal to the length L of the vertical probe.…”

Section: Equation 30mentioning

confidence: 99%

“…At the steady state temperature reached at QNHR and using the data recorded in step 3 calculate the heat carried away by conduction Qc using Equation 7. Use the results to compute the maximum mass of water flowing back to the dried area, mNHR, using Equation 14.…”

Section: Equation 33mentioning

confidence: 99%

See 3 more Smart Citations

The measurement of soil thermal stability, thermal resistivity, and underground cable ampacity

Malmedal¹,

Bates²,

Cain³

2014

2014 IEEE Rural Electric Power Conference (REPC)

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One of the most important factors affecting underground cable ampacity is the thermal resistivity of the soil. It is well known that thermal resistivity of the soil will vary with moisture content. It is also well known that the heat generated by cables can cause soil drying thus affecting the soil thermal resistivity. The ability of the soil to maintain its thermal resistivity in the presence of a heat source is known as thermal stability. Soil will increase in resistivity due to drying caused by heating from underground sources. This phenomenon makes it challenging for the design engineer to decide how to account for the drying effect in cable ampacity calculations. This paper will examine the information available from standard soil tests and the information these tests may provide relating to the migration of moisture in soil and the resulting changes in soil resistivity. Furthermore a method is suggested for including this information in underground cable ampacity calculations.

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“…4;r p= q effect of that moisture movement on the heat source. It is reported that laboratory and field tests consistently provide differing results for the resistivity of soil [7].…”

Section: Equationmentioning

confidence: 99%

Section: The Mechanism Of Heat Transfer Through Soilmentioning

confidence: 99%

Section: Equation 30mentioning

confidence: 99%

Section: Equation 33mentioning

confidence: 99%

See 2 more Smart Citations

The measurement of soil thermal stability, thermal resistivity, and underground cable ampacity

Malmedal¹,

Bates²,

Cain³

2014

2014 IEEE Rural Electric Power Conference (REPC)

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“…Also, the heat flow due to conduction from the pipeline to surrounding per unit mass of two-phase flow can be expressed as (Neher, 1949):…”

Section: Temperature Predictionmentioning

confidence: 99%

Explicit Method Predicts Temperature and Pressure Profiles of Gas-condensate Pipelines

Mokhatab¹

2007

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Prediction of the flow temperature and pressure variations becomes more important in the design and operation stages of the two-phase pipelines. This study presents an analytical approach for easy prediction of these parameters at any point along the two-phase, gas/gas-condensate transmission lines, applying basic laws of momentum and energy conservation. Masjed Soleiman to Mahshahr gas-condensate pipeline located in the southwest of Iran, as an example, shows the impact of the present method on the proper prediction of the temperature and pressure profiles.

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SF6 Gas Insulated Equipments

Maller¹

1981

Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum

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The Temperature Rise of Buried Cables and Pipes

Cited by 60 publications

References 9 publications

The measurement of soil thermal stability, thermal resistivity, and underground cable ampacity

The measurement of soil thermal stability, thermal resistivity, and underground cable ampacity

Explicit Method Predicts Temperature and Pressure Profiles of Gas-condensate Pipelines

SF6 Gas Insulated Equipments

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