基于波速的电缆交联聚乙烯绝缘温度评估

刘岑俐; 狄啟飞; 郑海涯; 张言铖; 黄浩; 张龙翔

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

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基于波速的电缆交联聚乙烯绝缘温度评估

牵引供电系统与新型配电系统优化控制技术 | 更新时间：2025-10-30

- 基于波速的电缆交联聚乙烯绝缘温度评估
- Temperature Assessment of Cross-linked Polyethylene Insulation for Cables Based on Wave Velocity
- 电力电容器与无功补偿 2025年46卷第5期页码：37-44
- 作者机构：
- 作者简介：
  
  刘岑俐（1984—），女，高级工程师，研究方向为配电网运行管理测试。E-mail：278027647@qq.com。
  狄啟飞（1993—），男，工程师，研究方向为高压电气试验。E-mail：363091152@qq.com。
  郑海涯（1989—），男，工程师，研究方向为配电技术。E-mail：53518662@qq.com。
  张龙翔（2001—），男，硕士，研究方向为电缆故障诊断。E-mail：1141266195@qq.com。
- 基金信息：
  
  国家自然科学基金面上项目(5247071733)
- DOI：10.14044/j.1674-1757.pcrpc.2025.05.004
  中图分类号：
- 收稿：2025-06-24，
  
  纸质出版：2025-10-25
- 稿件说明：
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刘岑俐, 狄啟飞, 郑海涯, 等. 基于波速的电缆交联聚乙烯绝缘温度评估[J]. 电力电容器与无功补偿, 2025,46(5):37-44.

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.
刘岑俐, 狄啟飞, 郑海涯, 等. 基于波速的电缆交联聚乙烯绝缘温度评估[J]. 电力电容器与无功补偿, 2025,46(5):37-44. DOI： 10.14044/j.1674-1757.pcrpc.2025.05.004.

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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references

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