Research on Detection Method of Water Ingress in the Outer Sheath of High Voltage Cable Based on Terahertz Wave Technology

CHEN Dabing; LIU Jianjun; GUO Dongliang; WANG Lei; MEI Hongwei; WANG Liming

doi:10.13296/j.1001-1609.hva.2026.05.017

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Research on Detection Method of Water Ingress in the Outer Sheath of High Voltage Cable Based on Terahertz Wave Technology

Research & Analysis | 更新时间：2026-05-13

- Research on Detection Method of Water Ingress in the Outer Sheath of High Voltage Cable Based on Terahertz Wave Technology
- High Voltage Apparatus Vol. 62, Issue 5, Pages: 149-156(2026)
- 作者机构：
  
  国网江苏省电力有限公司电力科学研究院，南京 211103
  清华大学深圳国际研究生院，广东深圳 518055
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.05.017
  CLC：
- Received：08 September 2025，
  
  Revised：2025-11-22，
  
  Published：16 May 2026
- 稿件说明：
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CHEN Dabing, LIU Jianjun, GUO Dongliang, et al. Research on Detection Method of Water Ingress in the Outer Sheath of High Voltage Cable Based on Terahertz Wave Technology[J]. High Voltage Apparatus, 2026, 62(5): 149-156.
DOI：

CHEN Dabing, LIU Jianjun, GUO Dongliang, et al. Research on Detection Method of Water Ingress in the Outer Sheath of High Voltage Cable Based on Terahertz Wave Technology[J]. High Voltage Apparatus, 2026, 62(5): 149-156. DOI： 10.13296/j.1001-1609.hva.2026.05.017.

摘要

近年来，电网频繁发生水分进入高压电缆缓冲层引发本体故障的情况。高压电缆的结构决定了很难采用无损检测方式获得内部缓冲层进水状态以及电蚀损情况，但可以通过外护套进水状态来初步判断高压电缆缓冲层是否存在隐患。文中对外护套材料以及水进行了太赫兹光谱特性分析，对110 kV高压电缆进行了太赫兹波成像检测试验。研究发现，水对太赫兹波具有强烈的吸收作用，干燥与进水状态下电缆外护套的太赫兹响应特性存在明显差异，例如：单个扫描点太赫兹波形、电缆整体的太赫兹特征参数等。对电缆的太赫兹波成像有效区分了进水外护套与干燥外护套，并识别了外护套的进水状态。

Abstract

In recent years

water ingress into the buffer layer of high-voltage cables of power grid has frequenctly occurred

leading to the failure of the cable itself. It is difficult to use non-destructive testing method to obtain the water ingress status and electrical erosion of the internal buffer layer due to the structure of the high-voltage cable. However

the presence of potential hazards in the buffer layer of high-voltage cables can be preliminarly assessed based on the water ingress status of the outer sheath. In this paper

the teraherza spectral characteristics of the outer sheath material and water are analyzed

and terahertzwave imaging detection tests are condcuted on 110 kV high-voltage cables. It is found by research that the water has a strong absorption effect on terahertz waves

and the terahertz response characteristic of the cable sheath has sinigifant difference under the dry and water ingress conditions

such as the terahertz waveform of a single scanning point and the overall characteristic parameters. The water ingress outer sheath and the dry outer sheath are effectively distinguished by the terahertz imaging and the water ingress status of the outer sheath is identified.

关键词

Keywords

references

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