An Improved Approximate Technique for Calculating Cable Temperature Transients [includes discussion]

Wormer, F. C. Van

doi:10.1109/aieepas.1955.4499079

Cited by 36 publications

(26 citation statements)

References 4 publications

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“…Further on the topic of transient simulations, in [33], Van Wormer introduced for the first time a theorybased method for improving the accuracy of the approximate solution obtained by lumped-capacitance thermal models. The author applies his finding to an equivalent "r electric circuit" including two parallel circuit loops and a modified "T electric circuit" including three circuit loops.…”

Section: Autogrounddesignmentioning

confidence: 99%

Power Cable Rating Calculations - A Historical Perspective [History]

Holyk¹,

Anders²

2015

IEEE Ind. Appl. Mag.

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Section: Autogrounddesignmentioning

confidence: 99%

Power Cable Rating Calculations - A Historical Perspective [History]

Holyk¹,

Anders²

2015

IEEE Ind. Appl. Mag.

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“…As for the transient heat-transfer process, a thermal capacitance parameter is introduced to describe the heat-storage model, which is shown in Figure 1a. Figure 1b shows a simplified arrangement of the thermal capacitance of the layer, as proposed by Van Wormer [23], who used an equivalent π thermal circuit to express the heat-transfer process. In Figure 1, thermal resistance T, thermal capacitance Q, and allocation factor p could be calculated, respectively, using the following equations:…”

Section: Principle Of Thermal Circuitsmentioning

confidence: 99%

Comparison of Conductor-Temperature Calculations Based on Different Radial-Position-Temperature Detections for High-Voltage Power Cable

et al. 2018

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Abstract:In this paper, the calculation of the conductor temperature is related to the temperature sensor position in high-voltage power cables and four thermal circuits-based on the temperatures of insulation shield, the center of waterproof compound, the aluminum sheath, and the jacket surface are established to calculate the conductor temperature. To examine the effectiveness of conductor temperature calculations, simulation models based on flow characteristics of the air gap between the waterproof compound and the aluminum are built up, and thermocouples are placed at the four radial positions in a 110 kV cross-linked polyethylene (XLPE) insulated power cable to measure the temperatures of four positions. In measurements, six cases of current heating test under three laying environments, such as duct, water, and backfilled soil were carried out. Both errors of the conductor temperature calculation and the simulation based on the temperature of insulation shield were significantly smaller than others under all laying environments. It is the uncertainty of the thermal resistivity, together with the difference of the initial temperature of each radial position by the solar radiation, which led to the above results. The thermal capacitance of the air has little impact on errors. The thermal resistance of the air gap is the largest error source. Compromising the temperature-estimation accuracy and the insulation-damage risk, the waterproof compound is the recommended sensor position to improve the accuracy of conductor-temperature calculation. When the thermal resistances were calculated correctly, the aluminum sheath is also the recommended sensor position besides the waterproof compound.

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“…. (18) A comparison of the corresponding numerical values of <x 3 (/) and ay j (0 for a 4in cable at 36in axial depth is given in Table 1. The numerical values are discussed in more detail in Section 6.…”

Section: £[-«(-£ (-£)mentioning

confidence: 99%

“…18 An assumption made in the derivation is that the temperature distribution in the insulation follows a steady-state logarithmic distribution for the period of the transient. Van Wormer has also given 18 an extension of the method, which is more accurate for the initial part of the transient but requires considerably more calculation.…”

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confidence: 99%

Transient heating of buried power cables

Goldenberg

1967

Proc. Inst. Electr. Eng. UK

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SynopsisAn account is given of past work in the field of thermal transients in buried cables. From the publications of Morello and Van Wormer, it follows that the earliest simplified theoretical formulas for the conductor transient, produced for application to small-diameter cables, can be correct only for times sufficiently large for the effect of the thermal capacity of the cable to be negligible. For such large times, the simple exponentialintegral formula is shown to give a cable-surface attainment factor that is closer to the solution of the proposed model of Whitehead and Hutchings than is the more complicated Whitehead-Hutchings formula itself, although the difference is generally negligible. A comparison is given between the cable-surface attainment factor based on a constant rate of heat flow from the cable to the soil, and the corresponding exponential-integral formula.

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An Improved Approximate Technique for Calculating Cable Temperature Transients [includes discussion]

Cited by 36 publications

References 4 publications

Power Cable Rating Calculations - A Historical Perspective [History]

Power Cable Rating Calculations - A Historical Perspective [History]

Comparison of Conductor-Temperature Calculations Based on Different Radial-Position-Temperature Detections for High-Voltage Power Cable

Transient heating of buried power cables

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