声-电融合检测在500 kV断路器自由金属颗粒缺陷诊断中的应用

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Abstract Gas insulated switchgear (GIS) is widely used in high-voltage power systems due to its compact structure and high reliability. However, internal free metal particle defects can easily trigger partial discharge, threatening equipment safety. To address the limitations of single detection methods, such as insufficient sensitivity and weak anti-interference capability, this paper proposes a combined detection technique integrating ultrasonic and ultra-high frequency (UHF) methods. By analyzing a case of a 500 kV GIS circuit breaker in a substation, the effectiveness of this technique is validated. The results indicate that ultrasonic detection captures pulse signals generated by particle collisions, while UHF detection locates defects through electromagnetic wave time differences. Their combination significantly enhances detection accuracy. Field tests demonstrate that the combined method precisely locates a metal particle in the first interrupter chamber, confirmed by post-disassembly inspection. Additionally, recommendations such as shielding interference and optimizing measurement points are proposed to improve live detection and risk assessment for GIS. This integrated approach provides technical support for defect diagnosis and maintenance strategy formulation in power systems.

Key words： gas insulated circuit breaker free metal particles ultrasonic detection ultra-high frequency detection partial discharge

Received: 08 December 2025

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	ZONG Wanli
	LIU Xiangjiang
	LIU Changbiao
	YANG Zhe

Cite this article:

ZONG Wanli,LIU Xiangjiang,LIU Changbiao等. Application of acoustic-electric signal fusion detection in the diagnosis of free metal particles in 500 kV circuit breakers[J]. Electrical Engineering, 2026, 27(8): 62-68.

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https://dqjs.cesmedia.cn/EN/Y2026/V27/I8/62

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