Temperature Assessment of Cross-linked Polyethylene Insulation for Cables Based on Wave Velocity

LIU Cenli; DI Qifei; ZHENG Haiya; ZHANG Yancheng; HUANG Hao; ZHANG Longxiang

doi:10.14044/j.1674-1757.pcrpc.2025.05.004

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Temperature Assessment of Cross-linked Polyethylene Insulation for Cables Based on Wave Velocity

Optimal Control Technology of Traction Power Supply System and New Power Distribution System | 更新时间：2025-10-30

- Temperature Assessment of Cross-linked Polyethylene Insulation for Cables Based on Wave Velocity
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 5, Pages: 37-44(2025)
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- DOI：10.14044/j.1674-1757.pcrpc.2025.05.004
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- Received：24 June 2025，
  
  Published：25 October 2025
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LIU Cenli, DI Qifei, ZHENG Haiya, et al. Temperature Assessment of Cross-linked Polyethylene Insulation for Cables Based on Wave Velocity[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 37-44.
DOI：

LIU Cenli, DI Qifei, ZHENG Haiya, et al. Temperature Assessment of Cross-linked Polyethylene Insulation for Cables Based on Wave Velocity[J]. Power Capacitor & Reactive Power Compensation, 2025, 46(5): 37-44. DOI： 10.14044/j.1674-1757.pcrpc.2025.05.004.

摘要

温度是电缆绝缘材料使用寿命的重要因素，为确保电缆安全，提升配网风险管控水平，必须监测和管理电缆的运行温度。当前测温技术存在成本及覆盖范围的瓶颈，难以在中低压电缆中广泛应用，文章基于交联聚乙烯（XLPE）介电谱的温度响应特性，提出了一种基于波速的电缆交联聚乙烯绝缘测温方法。波速与电缆分布电容

Abstract

Temperature is an important factor in the service life of insulation material of cables. For assuring the safety of cables and improving the risk control level of distribution network，it is necessary to monitor and manage the operating temperature of cables. The current temperature measurement technology has bottlenecks in both cost and coverage，and is difficult to be used widely in medium and low voltage cables. In this paper a wave velocity-based temperature measurement method for cross-linked polyethylene insulation of cables is propsoed on the basis of the temperature response characteristics of the dielectric spectrum of cross-linked polyethylene（XLPE）of cables. The wave velocity is related to the distributed capacitance C of the cables，and the dielectric constant that determines the C value is affected by temperature. Therefore，the relationship between wave velocity and temperature can be set up through C. First，the variation of the insulation dielectric constant of cables with temperature is obtained through experimental results and is simulated and analyzed by molecular dynamics simulation. Then，the relationship curve between wave velocity and temperature is set up based on the transmission characteristics of cables. Given that the temperature of the actual cross-section of cables gradually decreases from the inside to the outside，a temperature gradient is existed. Therefore，under the condition of considering temperature gradient，the rationality of obtaining the cable insulation temperature based on wave velocity inversion is proved by finite element simulation calculation， and the experimental verification is performed by taking the insulation midpoint temperature as an example.

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