Abstract
Sulfur hexafluoride (SF6) gas-insulated electrical equipment is widely used in high-voltage (HV) and extra-high-voltage (EHV) power systems. Partial discharge (PD) and local heating can occur in the electrical equipment because of insulation faults, which results in SF6 decomposition and ultimately generates several types of decomposition products. These SF6 decomposition products can be qualitatively and quantitatively detected with relevant detection methods, and such detection contributes to diagnosing the internal faults and evaluating the security risks of the equipment. At present, multiple detection methods exist for analyzing the SF6 decomposition products, and electrochemical sensing (ES) and infrared (IR) spectroscopy are well suited for application in online detection. In this study, the combination of ES with IR spectroscopy is used to detect SF6 gas decomposition. First, the characteristics of these two detection methods are studied, and the data analysis matrix is established. Then, a qualitative and quantitative analysis ES-IR model is established by adopting a two-step approach. A SF6 decomposition detector is designed and manufactured by combining an electrochemical sensor and IR spectroscopy technology. The detector is used to detect SF6 gas decomposition and is verified to reliably and accurately detect the gas components and concentrations.
Highlights
Electrical equipment is the fundamental basis of power systems, and its reliability is crucial to ensure grid security and stability [1]
A SF6 decomposition detector has been designed by combining electrochemical sensors and IR spectroscopy to lay the foundation for SF6 decomposition product online monitoring with an electrochemical sensing (ES)-IR evaluation of SF6 gas-insulated electrical equipment
With advantages such as a stable working performance, long-service life, low-power consumption, high-sensitivity and rapid-response speed, the electrometrical gas sensor is well-suited for field quantitative detection of gases that are toxic at low concentrations and combustible gases [9,16]
Summary
Electrical equipment is the fundamental basis of power systems, and its reliability is crucial to ensure grid security and stability [1]. Partial discharge (PD) and local overheating can occur in the GIS because of insulation faults, causing SF6 gas decomposition and generating several types of SF6 decomposition products, including SO2 F2 , SOF2 , CO, SO2 , H2 S, HF, CF4 , and SiF4 [3,4]. Sensors 2017, 17, 2627 state-of-safe and reliable GIS operation faces a severe threat The variation of these gases reflects the equipment internal PD and insulation status. The methods include gas chromatography, mass spectrometry, infrared (IR) spectroscopy, electrochemical sensing (ES), gas detector tubes, ion mobility spectrometry, and carbon nanotubes, among other methods [9,10,11,12,13] These detection methods still generally depend on regular field sampling and complete quantitative analysis of SF6 decomposition products in the laboratory. A SF6 decomposition detector has been designed by combining electrochemical sensors and IR spectroscopy to lay the foundation for SF6 decomposition product online monitoring with an ES-IR evaluation of SF6 gas-insulated electrical equipment
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