Research on Circulating Current and Its Suppression Method of Submarine Long-distance Cable

• Published in: 2022 IEEE International Conference on Power Systems Technology (POWERCON) pp. 1 - 6
• Main Authors: Pan, Wenxia, Miao, Jiawu
• Format: Conference Proceeding
• Language: English
• Published: IEEE 12.09.2022
• Subjects: ampacity; bonding types; circulating current; Current measurement; Electrical resistance measurement; Frequency measurement; Power measurement; submarine cable; Underwater cables; Voltage; Voltage measurement
• DOI: 10.1109/POWERCON53406.2022.9929891

Aiming at the problem of high induced voltage and circulating current in long-distance submarine cable, this paper establishes a complex model of submarine cable system in PSCAD/EMTDC to study the characteristics of induced voltage and circulating current of the sheath and armor under specific laying conditions based on an engineering project. The simulation results show that the length of the cable and the size of the load both affect the induced voltage and circulating current of the sheath and armor, thus affecting the ampacity of cable core. In order to reduce the circulating current of the sheath and improve the ampacity in the submarine cable, this paper adopts the method of stringing star resistance at the sheath joints at both ends of the submarine cable. The calculation results of the method show that it can significantly reduce the circulating current in the sheath under the condition that the induced voltage of the sheath does not exceed the limited requirement of the induced voltage at power frequency. To be specific, it can reduce the sheath circulating current by about 30.94% and the loss of the sheath by about 49.62%; The ampacity is increased by about 14.01%. Besides, the calculation method of the ampacity considering the sheath circulating current is more in line with the actual engineering situation than the IEC algorithm.