Research on the Photothermal Characteristics of Alternating Current Optical Fiber Composite Insulator During Salt Fog Flashover

WU Xiaoxiang; HAO Yanpeng; BI Jikai; WU Haixin; HUANG Lei

doi:10.13296/j.1001-1609.hva.2026.08.013

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Research on the Photothermal Characteristics of Alternating Current Optical Fiber Composite Insulator During Salt Fog Flashover

Research & Analysis | 更新时间：2026-08-12

- Research on the Photothermal Characteristics of Alternating Current Optical Fiber Composite Insulator During Salt Fog Flashover
- High Voltage Apparatus Vol. 62, Issue 8, Pages: 98-106(2026)
- 作者机构：
  
  华南理工大学电力学院，广州 510640
  郑州大学电气信息工程学院，郑州 450001
  广州南网科研技术有限责任公司，广州 510663
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.08.013
  CLC：
- Received：18 February 2026，
  
  Revised：2026-04-12，
  
  Published：16 August 2026
- 稿件说明：
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WU Xiaoxiang, HAO Yanpeng, BI Jikai, et al. Research on the Photothermal Characteristics of Alternating Current Optical Fiber Composite Insulator During Salt Fog Flashover[J]. High Voltage Apparatus, 2026, 62(8): 98-106.
DOI：

WU Xiaoxiang, HAO Yanpeng, BI Jikai, et al. Research on the Photothermal Characteristics of Alternating Current Optical Fiber Composite Insulator During Salt Fog Flashover[J]. High Voltage Apparatus, 2026, 62(8): 98-106. DOI： 10.13296/j.1001-1609.hva.2026.08.013.

摘要

面对沿海地区外绝缘污闪威胁，目前红外、可见光图像等电弧监测技术多为人工巡检手段，不具备实时监测和预警功能，外绝缘盐雾闪络过程研究对保障电网安全运行有重要意义。因此，文中建立了交流复合绝缘子盐雾闪络试验平台，在盐雾箱中进行植入光栅的10 kV交流复合绝缘子盐雾闪络试验，研究交流光纤复合绝缘子盐雾闪络过程光热特性。试验结果表明：交流复合绝缘子盐雾闪络过程可分为起弧、发展、闪络3个阶段；交流电弧可见光图像特征均呈二倍工频周期性变化，消失时红外热像滞后于可见光图像；起弧阶段电弧易发生熄灭、重燃，闪络电弧不熄灭且沿原放电通道周期性增强直至击穿；闪络过程绝缘子高温区由高压端向中心区域转移；界面温度在燃弧前先下降后上升的现象，电弧越剧烈界面温度变化越明显，该现象可实现电弧位置预测。文中研究为沿海地区复合绝缘子闪络预警提供了一种新方法。

Abstract

Facing the threat of external insulation pollution-induced flashovers in costal areas

the current arc monitoring techniques such as infrared and visible-light imaging primarily rely on manual inspections and lack real-time monitoring and early-warning functions. Research on the salt fog flashover process of external insulation is of great significance for ensuring safe operation of the power grid. Teherefore

an AC composite insulator salt fog flashover test platform is set up in this paper. A 10 kV AC composite insulator which embedded with fiber bragg grating(FBG) inside a salt fog chamber is subjected to salt fog flashover tests to study the optical-thermal characteristics of the AC optical fiber composite insulator during the salt fog flashover process. The test results reveal that the salt fog flashover process of the AC composite insulator is divided into the following three stagesase: arc initiation

development

and final flashover. The visible light image features of AC arc exhibit a periodical variation at twice the power frequency. The infrared thermal image lags behind visible light image when the arc disappears. During the arc ignition stage

the arc is prone to extinction and reignition. The flashover arc does not extinguish and periodically intensifies along the original discharge channel until breakdown occurs. During the flashover process

the high temperature zone of the insulator shifts from the high voltage end toward the central region. The interface temperature exhibits a phenomenon of first decreasing and then increasing before arcing

the more intense the arc

the more pronounced the interface temperature variation

which enables the prediction of arc location. The research presented in this paper provides a novel method for flashover early warning of composite insulator flashover in costal areas.

关键词

Keywords

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