Measurements and performance evaluations of natural ester and mineral oil-immersed identical transformers

Çilliyüz, Yusuf; Biçen, Yunus; Aras, Faruk; Aydugan, Guzide

doi:10.1016/j.ijepes.2020.106517

Cited by 27 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, many two-dimensional materials are used for gas sensor detection of dissolved gas in transformer oil in the field of dissolved gas analysis (DGA). By detecting the type and proportion of dissolved gas in transformer oil, we can assess the operation of electrical equipment, analyze the fault type, and then determine the corresponding maintenance method to reduce the loss, which is a significant topic in electric power research in recent times [13][14][15][16]. For instance, Qian et al found that an Au-doped MoS 2 monolayer can remarkably improve the adsorption performance for C 2 H 6 and C 2 H 4 gases [17].…”

Section: Introductionmentioning

confidence: 99%

Pd-GaSe and Pd3-GaSe Monolayers: Two Promising Candidates for Detecting Dissolved Gases in Transformer Oil

2022

View full text Add to dashboard Cite

In this paper, the adsorption behaviors of three gases (H2, CO, and C2H2) decomposed by the transformer oil on Pd-GaSe and Pd3-GaSe monolayers were calculated by density functional theory. Compared with Pd single-atom doping, Pd3 cluster doping changed the original structure and charge distribution to a greater extent, and more obviously improved the conductivity. According to the analysis of adsorption energy, charge transfer and deformation charge density, the results show that the two doped structures have better adsorption performance for the three gas molecules (H2, CO, and C2H2) than the intrinsic GaSe monolayer. Compared with Pd-GaSe, Pd3-GaSe showed stronger adsorption property for the three gases. Analysis of frontier molecular orbitals and recovery characteristics shows that Pd3-GaSe can be used as an ideal gas sensitive material for H2 detection because of its good desorption properties and obvious conductivity changes. Pd-GaSe can be used as a disposable resistive sensor for CO. Pd3-GaSe is a kind of sensing material suitable for disposable resistance sensors for CO and C2H2. These two doped structures have great application potential in gas adsorption and detection, and provide indications for further study on gas sensor detection by means of metal-doped GaSe monolayer.

show abstract

Section: Introductionmentioning

confidence: 99%

Pd-GaSe and Pd3-GaSe Monolayers: Two Promising Candidates for Detecting Dissolved Gases in Transformer Oil

2022

View full text Add to dashboard Cite

show abstract

“…Power transformers are part of the key equipment in power plants and substations, and the reliability of their operation determines power transmission and the operation of power plants [ 1 , 2 , 3 , 4 ]. So far, oil-immersed power transformers have been widely used in the power industry, using transformer-specific oil for insulation and heat dissipation [ 4 , 5 , 6 ]. When an internal insulation failure occurs in the power transformer equipment, such as partial discharge caused by a short circuit in the transformer, the transformer oil will decompose to produce a series of gases, including C 2 H 2 , C 2 H 4 , CH 4 , and H 2 [ 4 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive MEMS Sensor Using Bimetallic Pd–Ag Nanoparticles as Catalyst for Acetylene Detection

Yuan¹,

Qiao

Yao

et al. 2022

Sensors

View full text Add to dashboard Cite

Acetylene detection plays an important role in fault diagnosis of power transformers. However, the available dissolved gas analysis (DGA) techniques have always relied on bulky instruments and are time-consuming. Herein, a high-performance acetylene sensor was fabricated on a microhotplate chip using In2O3 as the sensing material. To achieve high sensing response to acetylene, Pd–Ag core-shell nanoparticles were synthesized and used as catalysts. The transmission electron microscopy (TEM) image clearly shows that the Ag shell is deposited on one face of the cubic Pd nanoseeds. By loading the Pd–Ag bimetallic catalyst onto the surface of In2O3 sensing material, the acetylene sensor has been fabricated for acetylene detection. Due to the high catalytic performance of Pd–Ag bimetallic nanoparticles, the microhotplate sensor has a high response to acetylene gas, with a limit of detection (LOD) of 10 ppb. In addition to high sensitivity, the fabricated microhotplate sensor exhibits satisfactory selectivity, good repeatability, and fast response to acetylene. The high performance of the microhotplate sensor for acetylene gas indicates the application potential of trace acetylene detection in power transformer fault diagnosis.

show abstract

“…The oil-paper insulation system is the heart of the oil-immersed transformer [1][2][3], which is composed of cellulose insulation paper/pressboard and insulation oil. In the past 120 years, mineral oil has been widely used in transformers due to its low cost and good heat dissipation performance, but its disadvantages such as limited biodegradability and low flash point have made it incompatible with today's demand for green insulation material [4,5]. In the past few years, there has been increasing interest in the use of natural esters as substitutes for mineral oil in power transformers [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental and molecular level analysis of natural ester delaying degradation of cellulose insulation polymer

Hao

Gao

et al. 2021

High Voltage

View full text Add to dashboard Cite

Developing green insulation materials has become an important direction for future research. As a new environmental insulation liquid, natural ester can effectively delay cellulose insulation polymer ageing. Mastering the mechanism of natural ester delaying the cellulose ageing could promote its application in power transformers. In this study, based on the accelerated thermal ageing of pressboard immersed in natural ester and 25# mineral oil at 120°C for 221 days, the thermal ageing rate and the levelling off degree of polymerisation (LODP) for two kinds of oil-impregnated pressboards were compared. The molecular level mechanism of natural ester delaying cellulose degradation and keeping higher LODP value was proposed using molecular dynamics simulation. At the early stage of thermal ageing, cellulose with a higher degree of polymerisation (DP) can form many hydrogen bonds with hydronium ions, and their binding energy is stronger, which can accelerate the acid hydrolysis of cellulose, causing the DP of pressboard immersed in natural ester and mineral oil to decrease rapidly. With the breaking of the cellulose molecular chain, the number of hydrogen bonds and binding energy between cellulose and hydronium ions becomes smaller and the thermal ageing rate decreases gradually. At the end stage of ageing, it is difficult for the hydronium ions to enter the crystalline cellulose, acid hydrolysis of crystalline cellulose is hard to conduct, leading to the occurrence of the LODP phenomenon. The degradation rate of cellulose in natural ester is only 50% of that in mineral oil. The cellulose LODP value in natural ester is over 200 larger than that in mineral oil. Compared with the mineral oil-cellulose system, natural ester can form hydrogen bonds with hydronium ions and lead to fewer hydronium ions in cellulose, fewer hydrogen bonds and smaller binding energy between cellulose and hydronium ions, which can reduce the acid hydrolysis reaction of cellulose. This study provides a theoretical explanation for natural esters to delay the ageing of insulation paper.

show abstract

Measurements and performance evaluations of natural ester and mineral oil-immersed identical transformers

Cited by 27 publications

References 28 publications

Pd-GaSe and Pd3-GaSe Monolayers: Two Promising Candidates for Detecting Dissolved Gases in Transformer Oil

Pd-GaSe and Pd3-GaSe Monolayers: Two Promising Candidates for Detecting Dissolved Gases in Transformer Oil

Highly Sensitive MEMS Sensor Using Bimetallic Pd–Ag Nanoparticles as Catalyst for Acetylene Detection

Experimental and molecular level analysis of natural ester delaying degradation of cellulose insulation polymer

Contact Info

Product

Resources

About