Rating of Electric Power Cables in Unfavorable Thermal Environment
Rating of Electric Power Cables in Unfavorable Thermal Environment is the first text to provide you with the computational tools and techniques needed to successfully design and install power cables in areas affected by such factors as outside heat sources, ground moisture, or impediments to heat dissipation. After thoroughly reviewing standard rating models, the author discusses several new techniques designed to improve cable ampacity, as well as new computational techniques for analysis of cyclic loads. To facilitate computational tasks he utilizes six representational model cables throughout the book, including transmission-class, high-voltage, distribution, and bundled types. End-of-chapter summaries, liberal numerical examples, and practical, real world applications make this text a valuable resource for making better design and operation decisions.
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Ampacity Reduction Factors for Cables Crossing Thermally
Cable CrossingsDerating Considerations
Application of Thermal Backfills for Cables Crossing Unfavorable
5 other sections not shown
6amb air temperature ambient ambient temperature analysis Anders applied assumed Brakelmann buried cables cable ampacity cable rating cable route cable surface temperature cable system cable tray cables crossing cables installed chapter characteristic diameter CIGRE computed from Equation conductor current conductor resistance conductor temperature consider convection cooling core current rating cyclic rating factor derating factor dielectric losses duct effect equal example external thermal resistance function given heat flow heat transfer coefficient hydraulic diameter IEC Standard IEEE Press insulation iterations joule joule losses kV cable layer length load variations longitudinal heat loss factor maximum method model cable moisture content multicore cables Neher Nusselt obtained from Equation optimization parameters permission from IEEE pipe pipe-type cable Power Cables probability distribution rated cable rating equations screen shown in Figure soil thermal resistivity steady-state stochastic optimization Table tapes thermal backfill thermal capacitance three-core cable tion transient variables voltages