c4f7n绝缘气体绝缘金属封闭开关设备中痕量CF4的检测：光声光谱级联特定化学反应

IF 4.4 2区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

High Voltage Pub Date : 2025-06-16 DOI:10.1049/hve2.70049

Zhicheng Wu, Jiahao Du, Zehao Zhang, Xiang Li, Shengjin Wang, Xiaoang Li, Qiaogen Zhang

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引用次数: 0

摘要

CF4是c4f7n绝缘气体绝缘金属封闭开关设备（GIS）在局部放电或过热故障时绝缘气体的主要分解产物。它的检测是有效在线监测和诊断GIS故障的关键。然而，光声光谱技术在CF4检测中的应用受到了背景气体C4F7N的交叉干扰。本文通过量子化学计算发现，C4F7N在碱催化下水解生成全氟异丁酸盐和氨，反应能垒低，吉布斯自由能变化大，引发容易，反应程度大。不像稳定的CF4不经历这样的反应，这种化学特异性使得通过这种水解反应可以检测到气体的选择性纯化。利用这一认识，构建了一个化学吸收净化和光声光谱检测级联的实验系统，通过碱催化的亲核水解反应选择性吸收C4F7N，效率达到95%以上，有效减轻了C4F7N在CF4检测中的交叉干扰。这使得在C4F7N的基本背景下精确检测微量CF4，检出限达到14.79 μL/L。这一进展为生态GIS的在线监测和故障诊断提供了支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Detection of trace CF4 in C4F7N-insulated gas-insulated metal-enclosed switchgear: Cascading specific chemical reactions with photoacoustic spectroscopy

CF₄ is a major decomposition product of the insulating gas in C₄F₇N-insulated gas-insulated metal-enclosed switchgear (GIS) during partial discharge or overheating faults. Its detection is essential for effective online monitoring and fault diagnosis of GIS. However, the application of photoacoustic spectroscopy for CF₄ detection is hampered by significant cross-interference from the background C₄F₇N gas. In this paper, quantum chemical calculations revealed that C₄F₇N hydrolyses to form perfluoroisobutyrate and ammonia under base catalysis, exhibiting a low reaction energy barrier and high Gibbs free energy change, indicating ease of initiation and substantial reaction extent. This chemical specificity, unlike the stable CF₄ which does not undergo such a reaction, enables selective purification of the gas to be detected through this hydrolysis reaction. Leveraging this insight, an experimental system was constructed that cascades chemical absorption purification with photoacoustic spectroscopy detection, and by selectively absorbing C₄F₇N through a base catalysed nucleophilic hydrolysis reaction to achieve over 95% efficiency, effectively mitigating the cross-interference of C₄F₇N in CF₄ detection. This enabled the precise detection of trace amounts of CF₄ against a substantial background of C₄F₇N with a detection limit reaching 14.79 μL/L. This advancement offers support for the online monitoring and fault diagnosis of eco-friendly GIS.

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来源期刊

High Voltage Energy-Energy Engineering and Power Technology

CiteScore

9.60

自引率

27.30%

发文量

审稿时长

21 weeks

期刊介绍： High Voltage aims to attract original research papers and review articles. The scope covers high-voltage power engineering and high voltage applications, including experimental, computational (including simulation and modelling) and theoretical studies, which include: Electrical Insulation ● Outdoor, indoor, solid, liquid and gas insulation ● Transient voltages and overvoltage protection ● Nano-dielectrics and new insulation materials ● Condition monitoring and maintenance Discharge and plasmas, pulsed power ● Electrical discharge, plasma generation and applications ● Interactions of plasma with surfaces ● Pulsed power science and technology High-field effects ● Computation, measurements of Intensive Electromagnetic Field ● Electromagnetic compatibility ● Biomedical effects ● Environmental effects and protection High Voltage Engineering ● Design problems, testing and measuring techniques ● Equipment development and asset management ● Smart Grid, live line working ● AC/DC power electronics ● UHV power transmission Special Issues. Call for papers: Interface Charging Phenomena for Dielectric Materials - https://digital-library.theiet.org/files/HVE_CFP_ICP.pdf Emerging Materials For High Voltage Applications - https://digital-library.theiet.org/files/HVE_CFP_EMHVA.pdf