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.
High VoltageEnergy-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