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Cable Construction and Installations
Modes of Heat Transfer and Energy Conservation
Circuit Theory Network Analogs for Thermal Modeling
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ac resistance Anders applied approximate armor loss assumed backfill bonded buried cables cable ampacity cable installations cable rating cable surface temperature cable system cable tray cables in air calculated Chapter CIGRE computed from equation conductor current constant convection heat transfer core cost current rating cyclic rating factor dielectric losses duct bank eddy current eddy current losses electrical electrical resistivity energy equal equivalent Example external diameter external thermal resistance flux formulas geometric factor given by equation heat conduction heat transfer coefficient IEC Standard IEEE IEEE Trans inductance insulation isothermal joule losses load maximum metallic model cable natural convection nodes obtained from equation parameters pipe pipe-type cable power cables proximity effect radius rating of cables reactance riser screen sheath and armor shown in Fig single-core cables skin effect soil solar radiation steady-state tape thermal capacitance thickness three-core cable tray trefoil underground unit length voltage