Detection of acetylene dissolved in transformer oil using sno2/rgo nanocomposite gas sensor

2016 ◽  
Author(s):  
Lingfeng Jin ◽  
Weigen Chen ◽  
Qu Zhou ◽  
Gongwei Xiao ◽  
Chutian Yu
Keyword(s):  
Gas Sensor ◽  
Transformer Oil

scholarly journals Using Field-Effect Gas Sensors for Monitoring H2 in Transformer Oil

2020 ◽  
Vol 327 ◽  
pp. 01005
Author(s):  
Artur Litvinov ◽  
Nikolay Samotaev ◽  
Maya Etrekova ◽  
Anastasia Ivanova ◽  
Dmitriy Filipchuk ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Field Effect ◽  
Semiconductor Structure ◽  
Transformer Oil ◽  
Ceramic Surface ◽  
Voltage Transformer ◽  
Metal Insulator ◽  
Metal Insulator Semiconductor ◽  
Highly Sensitive ◽  
High Voltage Transformer

Hydrogen can be released during the thermal decomposition of organic materials, therefore, monitoring its level in the working industrial high-voltage transformer oil allows you to identify the development of degenerative processes in advance, because these processes can lead to an accident in the future. In experiments has shown that highly sensitive and small-sized field effect gas sensor based on the metal-insulator-semiconductor structure can be used for measuring of Hydrogen in oil with direct contact of its structure with transformer oil. Given the harsh environmental conditions of hydrogen measurement the field effect capacity type gas sensor were fabricated by using laser micromilling technique for fabrication compact ceramic surface mounting device package and microheater for sustentation working temperature of metal-insulator-semiconductor structure.

scholarly journals High Performance Acetylene Sensor with Heterostructure Based on WO3 Nanolamellae/Reduced Graphene Oxide (rGO) Nanosheets Operating at Low Temperature

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 909 ◽  
Author(s):  
Zikai Jiang ◽  
Weigen Chen ◽  
Lingfeng Jin ◽  
Fang Cui ◽  
Zihao Song ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensor ◽  
High Performance ◽  
Gas Sensing ◽  
Hybrid Nanocomposites ◽  
Transformer Oil ◽  
X Ray ◽  
Reduced Graphene ◽  
Sensing Performance

The development of functionalized metal oxide/reduced graphene oxide (rGO) hybrid nanocomposites concerning power equipment failure diagnosis is one of the most recent topics. In this work, WO3 nanolamellae/reduced graphene oxide (rGO) nanocomposites with different contents of GO (0.5 wt %, 1 wt %, 2 wt %, 4 wt %) were synthesized via controlled hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses-derivative thermogravimetric analysis-differential scanning calorimetry (TG-DTG-DSC), BET, and photoluminescence (PL) spectroscopy were utilized to investigate morphological characterizations of prepared gas sensing materials and indicated that high quality WO3 nanolamellae were widely distributed among graphene sheets. Experimental ceramic planar gas sensors composing of interdigitated alumina substrates, Au electrodes, and RuO2 heating layer were coated with WO3 nanolamellae/reduced graphene oxide (rGO) films by spin-coating technique and then tested for gas sensing towards multi-concentrations of acetylene (C2H2) gases in a carrier gas with operating temperature ranging from 50 °C to 400 °C. Among four contents of prepared samples, sensing materials with 1 wt % GO nanocomposite exhibited the best C2H2 sensing performance with lower optimal working temperature (150 °C), higher sensor response (15.0 toward 50 ppm), faster response-recovery time (52 s and 27 s), lower detection limitation (1.3 ppm), long-term stability, and excellent repeatability. The gas sensing mechanism for enhanced sensing performance of nanocomposite is possibly attributed to the formation of p-n heterojunction and the active interaction between WO3 nanolamellae and rGO sheets. Besides, the introduction of rGO nanosheets leads to the impurity of synthesized materials, which creates more defects and promotes larger specific area for gas adsorption, outstanding conductivity, and faster carrier transport. The superior gas sensing properties of WO3/rGO based gas sensor may contribute to the development of a high-performance ppm-level gas sensor for the online monitoring of dissolved C2H2 gas in large-scale transformer oil.

MEMS hydrogen gas sensor for in-situ monitoring of hydrogen gas in transformer oil

2021 ◽  
Vol 326 ◽  
pp. 128989
Author(s):  
Vijay V. Kondalkar ◽  
Jihoon Park ◽  
Keekeun Lee
Keyword(s):  
Gas Sensor ◽  
Hydrogen Gas ◽  
Transformer Oil ◽  
In Situ Monitoring

Quantitative Detection of C2H2 Gas Based on an Infrared Laser Gas Sensor

2015 ◽  
Vol 1092-1093 ◽  
pp. 400-406
Author(s):  
Jia Gui Tao ◽  
Jing Lei Shi ◽  
Xiao Xing Zhang
Keyword(s):  
Gas Sensor ◽  
Volume Fraction ◽  
Detection System ◽  
Least Square Method ◽  
Infrared Laser ◽  
State Assessment ◽  
Least Square ◽  
Transformer Oil ◽  
System Structure ◽  
Quantitative Detection

Detection of C2H2 gas in transformer oil is significant for diagnosing the operating state assessment of power equipment. The paper develops an infrared laser gas sensor to detect the C2H2 gas in transformer oil, and also introduces the system structure in detail. A gas-absorbed laser cell that contains a series of laser reflectors is designed and used in our detection system, which adds the optical path without changing the volume of the cell. 1529.16nm is chosen as the characteristic spectrum line of C2H2 gas, and concentration of C2H2 gas is quantitatively analyzed based on least square method. The experiment result shows that in certain volume fraction range of acetylene, the absorbance has a good linear relationship with the acetylene concentration, and the minimum detection limit for acetylene is 10μL/L. In general, the developed infrared laser gas sensor can detect C2H2 gas in transformer oil effectively.

SnO2 Nanofibers Gas Sensor Detecting H2 Dissolved in Transformer Oil

2013 ◽  
Vol 706-708 ◽  
pp. 1008-1011
Author(s):  
Shu Di Peng ◽  
Gao Lin Wu ◽  
Qian Wang
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Power Transformer ◽  
Synthesis Method ◽  
Transformer Oil ◽  
Optimum Operating ◽  
Optimum Operating Temperature ◽  
Fault Gas ◽  
Response And Recovery ◽  
Hydrothermal Approach

Hydrogen is an effective fault gas dissolved in transformer oil, and online monitoring its concentration has important meaning on condition assessment and fault diagnosis of power transformer. A facile and simple synthesis method of ultra-sensitive SnO2nanofibers through a hydrothermal approach was reported. The crystalline phases and microstructures were performed by X-ray powder diffraction and field-emission scanning electron microscopy. The gas sensor based on prepared SnO2 nanofibers was fabricated by a side-heated preparation, and its gas sensing performances to H2were measured. The fabricated sensor exhibits excellent sensing properties to H2, such as low optimum operating temperature, high gas response, rapid response and recovery time, good stability and repeatability.

scholarly journals Using Pd-Doped γ-Graphyne to Detect Dissolved Gases in Transformer Oil: A Density Functional Theory Investigation

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1490 ◽  
Author(s):  
Xiaoxing Zhang ◽  
Rongxing Fang ◽  
Dachang Chen ◽  
Guozhi Zhang
Keyword(s):  
Electron Transfer ◽  
Electronic Properties ◽  
Gas Sensor ◽  
Adsorption Energy ◽  
Density Functional ◽  
High Selectivity ◽  
Gas Sensing ◽  
Transformer Oil ◽  
Dissolved Gases ◽  
Adsorption Sites

To realize a high response and high selectivity gas sensor for the detection dissolved gases in transformer oil, in this study, the adsorption of four kinds of gases (H2, CO, C2H2, and CH4) on Pd-graphyne was investigated, and the gas sensing properties were evaluated. The energetically-favorable structure of Pd-Doped γ-graphyne was first studied, including through a comparison of different adsorption sites and a discussion of the electronic properties. Then, the adsorption of these four molecules on Pd-graphyne was explored. The adsorption structure, adsorption energy, electron transfer, electron density distribution, band structure, and density of states were calculated and analyzed. The results show that Pd prefers to be adsorbed on the middle of three C≡C bonds, and that the band gap of γ-graphyne becomes smaller after adsorption. The CO adsorption exhibits the largest adsorption energy and electron transfer, and effects an obvious change to the structure and electronic properties to Pd-graphyne. Because of the conductance decrease after adsorption of CO and the acceptable recovery time at high temperatures, Pd-graphyne is a promising gas sensing material with which to detect CO with high selectivity. This work offers theoretical support for the design of a nanomaterial-based gas sensor using a novel structure for industrial applications.

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