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General survey of existing and future powercable systems
Evaluation of temperature field by integral equation method 152
Some possible improvements in underground cable performance
13 other sections not shown
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190mm DISTANCE aluminium ambient buried cables C-mjW cable backfills cable insulation cable surface cable system calculated coarse-grained compaction convection cooling cryogenic current rating current-carrying capacity decomposed granite dielectric losses DISTANCE FROM PROBE dry density e.h.v. cables electrical equally-loaded external thermal resistance grading curve heat conduction heat dissipation heat flow heat source heat transfer heater heating probe hygroscopic identical cables increase initial moisture content installation integral equation isothermal earth surface kaolinite clay layer liquid loading maximum moisture content moisture migration needle probe niobium oil-filled cables overall thermal resistivity phase polyethylene porosity power cables PROBE SURFACE proximity effects rhyolite sand saturated sheath shown in Fig silt skin effect soil particles soil thermal stabilized cable surround successive images sulphur hexafluoride superconducting cables Table temperature temperature difference temperature rise thermal capacity thermal conductivity thermal gradients three cables trefoil-touching formation underground cables values of thermal variations in thermal voids voltage zones