Abstract
Shore power system that powers berthing ships is gradually becoming widely used worldwide because it helps reduce air and noise pollution. However, due to the bad environment of the port, the influence of the port tide on the temperature distribution and the ampacity of the shore power cable connecting the ship and shore can't be ignored. Therefore, in this paper, a thermal field calculation model of shore power cable based on electromagnetic-thermal-flow coupling field is presented, in which the impact of tide has been considered. And the validity of the coupling model is verified by thermal circuit method base on IEC(International Electrotechnical Commission) 60287 standard. Then, the influence of cable immersion depth, water velocity and temperature, wind speed and air temperature on the temperature distribution of shore power cable was analyzed based on the multi-field coupling model. Finally, the ampacity of shore power cable in different environments is calculated by the combined Newton iterative and numerical simulation method. The results indicate that the conductor temperature firstly decreases and then increases with the immersion depth. And when the immersion depth is small, the wind speed dominates the temperature of the conductor. While the water flow speed plays a leading role in the conductor temperature when the immersion depth is deeper. In addition, the relationship between ambient temperature and capacity of shore power cable is approximately linear.
Highlights
According to the International Maritime Organization, the marine industry emits about 1.1 billion tons of carbon dioxide and about 16 million tons of sulfur dioxide each year, which is twice and 200 times the world’s automobile emissions
Based on the research results of temperature and ampacity calculation of land cables, this paper proposes a method for calculating the ampacity by combining numerical simulation and Newton iteration method
Only the influence of wind speed and air temperature is considered when laid in air, and only the influence of water flow speed and temperature is considered when laid in water
Summary
According to the International Maritime Organization, the marine industry emits about 1.1 billion tons of carbon dioxide and about 16 million tons of sulfur dioxide each year, which is twice and 200 times the world’s automobile emissions. In reference [9], the influence of soil moisture transfer and closed air layer on the thermal path analysis model is investigated in detail, and a method combining real-time environmental monitoring and multi-physical field numerical simulation is proposed. Studying the temperature field numerical simulation of shore power cables based on electromagnetic-thermal-current coupling with tide influence considered is of great significance for the accurate calculation of the ampacity. An electromagnetic-thermal-current multifield coupled temperature field calculation model for a 8.7 / 10 kV three-core shore power cable in Chongqing Foeryan Port is established, and further consideration of tidal effects is conducted. Based on the simulation results of cable temperature field, the real-time ampacity of shore power cable is calculated by the coupling simulation and Newton’s method
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