Using a sensitive optical system to analyze gases dissolved in samples extracted from transformer oil

Wan, Fu; Zhou, Qu; Zou, Jian; Gu, Zhaoliang; Chen, Weigen; Wang, Caisheng

doi:10.1109/mei.2014.6882596

Cited by 18 publications

(7 citation statements)

References 38 publications

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“…Dissolved gas analysis (DGA) is an oil-immersed transformer fault prediction and detection technique, based on the measurement of dissolved gases 12 . And there are some methods to detect fault gases, such as: gas chromatography (GC) 13 , thermal conductivity detector (TCD) and optical methods such as: spectral absorption method, photoacoustic spectroscopy 14 , 15 . However, these methods have following drawbacks: GC is a widely used technique for quantitatively measuring fault gases concentration.…”

Section: Introductionmentioning

confidence: 99%

Tracing Acetylene Dissolved in Transformer Oil by Tunable Diode Laser Absorption Spectrum

Guo

Zhao

Jiang

et al. 2017

Sci Rep

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Dissolved gas analysis (DGA) is widely used in monitoring and diagnosing of power transformer, since the insulation material in the power transformer decomposes gases under abnormal operation condition. Among the gases, acetylene, as a symbol of low energy spark discharge and high energy electrical faults (arc discharge) of power transformer, is an important monitoring parameter. The current gas detection method used by the online DGA equipment suffers from problems such as cross sensitivity, electromagnetic compatibility and reliability. In this paper, an optical gas detection system based on TDLAS technology is proposed to detect acetylene dissolved in transformer oil. We selected a 1530.370 nm laser in the near infrared wavelength range to correspond to the absorption peak of acetylene, while using the wavelength modulation strategy and Herriott cell to improve the detection precision. Results show that the limit of detection reaches 0.49 ppm. The detection system responds quickly to changes of gas concentration and is easily to maintenance while has no electromagnetic interference, cross-sensitivity, or carrier gas. In addition, a complete detection process of the system takes only 8 minutes, implying a practical prospect of online monitoring technology.

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Section: Introductionmentioning

confidence: 99%

Tracing Acetylene Dissolved in Transformer Oil by Tunable Diode Laser Absorption Spectrum

Guo

Zhao

Jiang

et al. 2017

Sci Rep

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“…Their reliability is significant for the safety and stability of power grids [1]. It is well known that dissolved CO and CO 2 [2,3], furans [4,5] and dielectric properties of oil [6,7] can be used for the aging evaluation of an operating transformer [8]. Under the long-term operation, mineral oil will react with dissolved oxygen to form carboxylic acids of varying molecular weight and then dissolve in transformer oil [9].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method to Directly Analyze Dissolved Acetic Acid in Transformer Oil without Extraction Using Raman Spectroscopy

Wan

Chen

et al. 2017

Energies

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Analyzing the concentration of low molecular acids dissolved in oil is vital in the oil-paper insulation aging diagnostic procedure of power transformers. The existing methods cannot distinguish between different acid types and their strengths. In this study, an improved solution Raman detection platform is fabricated. The direct measurement of dissolved acetic acid, a kind of low molecular acids, is observed in transformer oil without extraction. The Raman shift line of oil-dissolved acetic acid at 891 cm −1 corresponding to H-C-H symmetrical swing and O-H swing modes is taken as its characteristic value. Taking Raman shift line of pure oil at 932 cm −1 as an internal standard, a linear regression curve for quantitative analysis is obtained with a slope of 0.19. The best platform parameter of accumulation number is 300, which is determined by Allan deviation analysis. The current concentration detection limit and accuracy for oil-dissolved acetic acid are obtained at about 0.68 mg/mL and 91.66%, separately. The results show that Raman spectroscopy could be a useful alternative method for evaluation insulation aging state of an operating power transformer in the future.

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“…However, acetylene is unstable and there is a huge potential risk of fire or explosive accidents during its compression and heat treatment, or due to leakage. Furthermore, the dissolved content of acetylene gas in power transformer oil is critical to the safety and reliability of the transformer system [ 5 , 6 ]. Therefore, reliable, economical and portable acetylene gas sensors are of great importance to many applications.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, reliable, economical and portable acetylene gas sensors are of great importance to many applications. In recent years, a lot of interest has been attracted surrounding the development of effective techniques and sensitive methods for acetylene gas detection, such as photoacoustic spectroscopy [ 7 ], optical fiber [ 6 , 8 ] and metal-oxide semiconductors (MOS) and nanomaterial-based sensors (i.e., PdO-decorated SnO 2 [ 9 ], Au/multi-wall carbon nanotubes [ 10 ], Sm 2 O 3 -decorated SnO 2 [ 11 ], Ag-loaded ZnO [ 12 , 13 , 14 ] and NiO/SnO 2 heterostructures [ 15 ]). Among them, metal oxides have become important candidates for acetylene sensing due to their unique advantages—such as their small size and simplicity of integration—but they lack selectivity towards different gas species, and often require high operating temperatures and have high power consumption [ 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Acetylene Gas-Sensing Properties of Layer-by-Layer Self-Assembled Ag-Decorated Tin Dioxide/Graphene Nanocomposite Film

et al. 2017

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This paper demonstrates an acetylene gas sensor based on an Ag-decorated tin dioxide/reduced graphene oxide (Ag–SnO2/rGO) nanocomposite film, prepared by layer-by-layer (LbL) self-assembly technology. The as-prepared Ag–SnO2/rGO nanocomposite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectrum. The acetylene sensing properties were investigated using different working temperatures and gas concentrations. An optimal temperature of 90 °C was determined, and the Ag–SnO2/rGO nanocomposite sensor exhibited excellent sensing behaviors towards acetylene, in terms of response, repeatability, stability and response/recovery characteristics, which were superior to the pure SnO2 and SnO2/rGO film sensors. The sensing mechanism of the Ag–SnO2/rGO sensor was attributed to the synergistic effect of the ternary nanomaterials, and the heterojunctions created at the interfaces between SnO2 and rGO. This work indicates that the Ag–SnO2/rGO nanocomposite is a good candidate for constructing a low-temperature acetylene sensor.

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Using a sensitive optical system to analyze gases dissolved in samples extracted from transformer oil

Cited by 18 publications

References 38 publications

Tracing Acetylene Dissolved in Transformer Oil by Tunable Diode Laser Absorption Spectrum

Tracing Acetylene Dissolved in Transformer Oil by Tunable Diode Laser Absorption Spectrum

A Novel Method to Directly Analyze Dissolved Acetic Acid in Transformer Oil without Extraction Using Raman Spectroscopy

Acetylene Gas-Sensing Properties of Layer-by-Layer Self-Assembled Ag-Decorated Tin Dioxide/Graphene Nanocomposite Film

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