Investigation of the Impact of XLPE Cable Ageing on Impedance Mismatch Characteristics and Unbalanced Behaviour in Hybrid Operation Systems

IF 4.9 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
High Voltage Pub Date : 2025-09-29 DOI:10.1049/hve2.70106
Liang Zou, Zheng Liu, Qingsong Liu, Zhiyun Han, Shoushui Han
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引用次数: 0

Abstract

In the Hainan–Guangdong interconnection project, oil leakage in oil-filled cables required replacing the faulty core with a single core from a three-core cross-linked polyethylene (XLPE) cable, leading to mixed operation of XLPE and oil-filled cables. However, systematic quantitative analysis on the three-phase unbalance caused by differences in material parameters between the two cable types is lacking. This study focuses on the mixed operation system, using a real-time digital simulation platform to build power flow and current distribution models. Finite element thermal analysis and accelerated thermal ageing experiments were conducted to reveal the evolution of XLPE cable insulation dielectric parameters during ageing. Two evaluation indices, the impedance mismatch coefficient and the length mismatch coefficient, were proposed to quantify how material degradation worsens system unbalance. Results show that after 1440 h of ageing, the system's negative-sequence and zero-sequence unbalance increased by 24.4% and 28.7%, respectively. A critical impedance mismatch threshold is identified; once exceeded, unbalance escalates and the system's stability margin diminishes. This research provides theoretical support for recognising ageing-induced sequence impedance mismatch and related unbalance effects in hybrid submarine cable systems and lays a foundation for optimising operational stability and designing compensation strategies.
交联聚乙烯电缆老化对混合运行系统阻抗失配特性和不平衡行为影响的研究
在海广互联工程中,充油电缆出现漏油问题,需要将三芯交联聚乙烯(XLPE)电缆的故障芯更换为单芯,导致交联聚乙烯与充油电缆混运。然而,对于两种电缆材料参数的差异所导致的三相不平衡,目前还缺乏系统的定量分析。本研究以混合运行系统为研究对象,利用实时数字仿真平台建立潮流和电流分布模型。通过有限元热分析和加速热老化实验,揭示了交联聚乙烯电缆绝缘介电参数在老化过程中的演变规律。提出了阻抗失配系数和长度失配系数两个评价指标来量化材料降解如何加剧系统不平衡。结果表明,老化1440 h后,系统负序和零序不平衡分别增加了24.4%和28.7%。确定了一个临界阻抗失配阈值;一旦超过,不平衡就会升级,系统的稳定边际就会减小。该研究为识别混合海缆系统中老化引起的序列阻抗失配及相关不平衡效应提供了理论支持,并为优化运行稳定性和设计补偿策略奠定了基础。
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来源期刊
High Voltage
High Voltage Energy-Energy Engineering and Power Technology
CiteScore
9.60
自引率
27.30%
发文量
97
审稿时长
21 weeks
期刊介绍: High Voltage aims to attract original research papers and review articles. The scope covers high-voltage power engineering and high voltage applications, including experimental, computational (including simulation and modelling) and theoretical studies, which include: Electrical Insulation ● Outdoor, indoor, solid, liquid and gas insulation ● Transient voltages and overvoltage protection ● Nano-dielectrics and new insulation materials ● Condition monitoring and maintenance Discharge and plasmas, pulsed power ● Electrical discharge, plasma generation and applications ● Interactions of plasma with surfaces ● Pulsed power science and technology High-field effects ● Computation, measurements of Intensive Electromagnetic Field ● Electromagnetic compatibility ● Biomedical effects ● Environmental effects and protection High Voltage Engineering ● Design problems, testing and measuring techniques ● Equipment development and asset management ● Smart Grid, live line working ● AC/DC power electronics ● UHV power transmission Special Issues. Call for papers: Interface Charging Phenomena for Dielectric Materials - https://digital-library.theiet.org/files/HVE_CFP_ICP.pdf Emerging Materials For High Voltage Applications - https://digital-library.theiet.org/files/HVE_CFP_EMHVA.pdf
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