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| Study on Loss Characteristics of Three Core Armored Cable under Low-Frequency Transmission Mode Based on Electromagnetic, Thermal Coupling Principle |
| Liu Shili1, Luo Yingnan1, Liu Zongye2, Deng Jinsuo1, Cai Guowei1 |
1. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China;
2. State Key Lab of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co.Ltd Beijing 102209 China |
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Abstract Accurately computing cable loss is one of the critical issues to improve the economics of submarine cables and realize the efficient transmission of deep-sea wind power. In this study, according to the submarine cable's actual laying conditions, a multi-physical coupling model of submarine cable is established based on the electromagnetic field and heat transfer field. This model can help to analyze the distribution of cable core current under low-frequency transmission mode. Based on this model,this paper studies induced voltage calculated by IEC standard, loss factor, and error of ampacity. The research shows that the average current density of the cable core deviates from the cable core center. The deviation distance increases with the increase of transmission frequency, which caused the sheath induced voltage and loss error calculated by IEC to change in the same direction. When the core radius is greater than 24mm, the sheath loss factor's error becomes more massive. When the cable core's cross-sectional area is 2 000 mm2, the ampacity error under fractional frequency and industrial frequency is about 10% and 15%, respectively. The calculation results lay a foundation for reasonable determination of the current carrying capacity of submarine cables.
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Received: 30 November 2020
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2021, Vol. 36 
