Including Soil Drying Time in Cable Ampacity Calculations

Wave-Velocity Based Real-Time Thermal Monitoring of Medium-Voltage Underground Power Cables

“…These parameters are hard to estimate with high accuracy. A detailed calculation of the dried soil radius can be found, e.g., in [7], [8], [20]. The TEE models and the parameters used for this paper are summarized in the Appendix.…”

“…These models are well-developed [3]- [5], but their predictive value may be hampered by parameter uncertainties. In particular, the thermal resistivity of the soil surrounding the cable has a pronounced effect on the thermal behavior [3], [6]- [8] and its value depends significantly on the moisture conditions. To accommodate this uncertainty, temperature margins need to be incorporated to guarantee safe operation.…”

Ampacity and thermal equivalent modeling of subsea power cables for long distance power transmission and optimization

“…The differences in ampacity values determined using various commonly followed methods are presented in [58] and the authors emphasized the significance of in-situ measurements of soil thermal resistivity over the "typical" value approach. The authors of [102][103][104] presented underground cable ampacity models paying attention to the effects of soil moisture content and soil-drying on the ampacity rating. These works indicate that the soil moisture content and moisture migration have a significant effect on the actual current carrying capacity.…”