计及锚固装置的 500kV 交流海缆接地性能与降损措施研究

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关键词：锚固装置；交流海缆;矩阵级联;感应电压；接地性能；降损措施DOI：10.15938/j. emc.2025.11.001中图分类号：TM757.4 文献标志码：A 文章编号：1007-449X（2025）11-0001-14

Research on grounding performance and loss-reduction measures of 50O kV AC submarine cables considering anchoring devices

SU Ningjie 1 ，GE Junkai²， ZHANG Jialin1， YANG Yong²， HE Jian²， CHEN Xiangrong1 （1.College of Electrical Engineering， Zhejiang University，Hangzhou 310o27，China; 2.State Grid Zhejiang Electric Power Co.，Ltd.，Research Institute，Hangzhou ，China）

Abstract ：To investigate the grounding performance issues caused by the anchoring devices in the landing section of AC submarine cable systems，the impedance and admitance parameters of the cable were derived based on the multi-conductor cell analysis. A nodal admitance matrix was constructed using the Laurent series expansion，and a cascading algorithm was developed. The Zhoushan 500kV Luoyuan 5498 submarine cable section is taken as a case study to analyze its grounding performance and loss reduction measures.Results indicate that under various operating conditions，the core and armor currents vary smoothly，while the sheath current exhibits a decrease-increase-decrease trend，peaking near the Zhenhai

terminal，with all induced voltages remaining below 42V . The sheath current at the Zhenhai terminal is significantly higher than that at the Dapeng Island terminal，with the algorithm’s maximum error under 4.00% compared to measurements. Increased contact resistance at the Zhenhai anchoring point redistributes current， raising sheath current by 466% and reducing armor current by 35.70% . Inserting （204号 1.25Ω resistors or reactors into the sheath loop reduces losses by 4，18% and 4，43% ，respectively. Further optimization（1.5 Ω ， 55∘ phase angle）achieves a 5.92% reduction，with sheath-induced voltages remaining within limits. The study provides a new calculation method and engineering reference for the grounding performance analysis and loss reduction measures of submarine cable systems considering anchoring devices.

Keywords：anchoring devices； AC submarine cable； matrix cascade; induced voltage； grounding per-formance；loss reduction measures

0引言

随着“双碳”目标的深入推进，跨海输电作为实现能源跨区域优化配置的重要技术手段，其核心载体海底电缆的战略地位愈发凸显[1-3]。（剩余19401字）