Correlating UV Visible Spectral Response and Thermal Ageing of Blended Transformer Oil

2021 ◽  
Author(s):  
Manas Chakraborty ◽  
Niharika Baruah ◽  
Sisir Kumar Nayak ◽  
Prabhat Kumar Maiti
Keyword(s):  
Spectral Response ◽  
Thermal Ageing ◽  
Transformer Oil ◽  
Uv Visible

scholarly journals Studies on the substrate-dependent photocatalytic properties of Cu2O heterojunctions

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 4935-4941
Author(s):  
Riza Ariyani Nur Khasanah ◽  
Hui-Ching Lin ◽  
Hsiang-Yun Ho ◽  
Yen-Ping Peng ◽  
Tsong-Shin Lim ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Charge Separation ◽  
Spectral Response ◽  
Photocatalytic Properties ◽  
Visible Light Absorption ◽  
Uv Visible

Cu2O/TNA/Ti photoanode showed spectral response outperformed Cu2O/Ti and Cu2O/FTO photocathodes. Cu2O/TNA/Ti showed better spectral response than that of TNA/Ti, ascribed to UV-visible light absorption of Cu2O, not to charge separation enhancement.

scholarly journals Facile Synthesis of Indium Sulfide/Flexible Electrospun Carbon Nanofiber for Enhanced Photocatalytic Efficiency and Its Application

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Liu Han ◽  
Haohao Dong ◽  
Dong Mao ◽  
Baolv Hua ◽  
Qinyu Li ◽  
...  
Keyword(s):  
Carbon Nanofiber ◽  
Diffuse Reflectance Spectroscopy ◽  
Spectral Response ◽  
Heterogeneous Systems ◽  
Indium Sulfide ◽  
One Pot ◽  
One Dimensional ◽  
Response Range ◽  
Uv Visible ◽  
The One

Heterojunction system has been proved as one of the best architectures for photocatalyst owing to extending specific surface area, expanding spectral response range, and increasing photoinduced charges generation, separation, and transmission, which can provide better light absorption range and higher reaction site. In this paper, Indium Sulfide/Flexible Electrospun Carbon Nanofiber (In2S3/CNF) heterogeneous systems were synthesized by a facile one-pot hydrothermal method. The results from characterizations of SEM, TEM, XRD, Raman, and UV-visible diffuse reflectance spectroscopy displayed that flower-like In2S3 was deposited on the hair-like CNF template, forming a one-dimensional nanofibrous network heterojunction photocatalyst. And the newly prepared In2S3/CNF photocatalysts exhibit greatly enhanced photocatalytic activity compared to pure In2S3. In addition, the formation mechanism of the one-dimensional heterojunction In2S3/CNF photocatalyst is discussed and a promising approach to degrade Rhodamine B (RB) in the photocatalytic process is processed.

Research of Ageing and Life Assessment Methods of Power Transformers in Nuclear Power Plants

2012 ◽  
Vol 614-615 ◽  
pp. 1109-1115 ◽  
Author(s):  
Cheng Feng Yang
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Assessment Method ◽  
Thermal Ageing ◽  
Degree Of Polymerization ◽  
Transformer Oil ◽  
Life Assessment ◽  
Power Transformers ◽  
Analysis Method

The effective methods of the ageing and life assessment for large and medium-sized power transformers used in nuclear power plants are analyzed and described, including the thermal ageing life assessment method for transformer solid insulation, the gas analysis method of CO and CO2 in the transformer oil, the average degree of polymerization method, furfural content analysis method, and the analysis method based on the insulation ageing-related electrical parameters. The analysis results show that the methods used can reasonably assess the remaining life of the transformers. These methods have important reference value to the ageing and life management for the large and medium-sized power transformers in nuclear power plants.

scholarly journals In-Service Transformer Oil Regeneration Based on Laboratory-Scale Process

2020 ◽  
Vol 79 (1) ◽  
pp. 27-35
Author(s):  
Imran Sutan Chairul ◽  
Sharin Ab Ghani ◽  
Norazhar Abu Bakar ◽  
Mohd Shahril Ahmad Khiar ◽  
Aminur Hazieq Zulkefli ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Power Transformer ◽  
Decay Product ◽  
Acid Number ◽  
Transformer Oil ◽  
Regeneration Process ◽  
Glass Bottle ◽  
Total Acid ◽  
Uv Visible ◽  
Fuller’S Earth

This paper described in-laboratory oil regeneration process of aged transformer oil using adsorbent; Fuller’s earth. The niche of this paper is the usage of real aged transformer oil taken from an 11kV/433V in-service power transformer made by ACEC Transformer in 1986. The regeneration process is achieved by forcing a mixture of aged transformer oil and Fuller’s earth through a filter paper with the aid of a vacuum pump, hence producing reclaimed transformer oil. This oil was then inserted in an amber glass bottle, blanketed with nitrogen, tightly sealed, and labelled. To test the effectiveness of Fuller’s earth as adsorbent, parameters of Dissolved Decay Product (DDP) were measured using UV-Visible Spectrophotometer (UV-Vis) by referring to ASTM D6802. In addition, Total Acid Number (TAN) and Breakdown Voltage (BdV) measurement were carried out complying the ASTM D974 and ASTM D1816 respectively. Results of UV-Vis indicated that Fuller’s earth can adsorbed 25.24% of DDP in aged transformer oil. As the DDP decreased, TAN is 84.62% reduced while BdV increased 50%. These findings are parallel with the breakdown voltage mechanism due to acidity emergence. It is proved that Fuller’s earth is effective adsorbent for oil regeneration process.

Transparent graphene electrodes based hybrid perovskites photodetectors with broad spectral response from UV-visible to near-infrared

2021 ◽  
Author(s):  
Guoming Lin ◽  
Yuanwei Lin ◽  
Baoyun Sun
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Spectral Response ◽  
Current Ratio ◽  
Daily Lives ◽  
New Class ◽  
Weak Light ◽  
Uv Visible ◽  
Halide Perovskite ◽  
New Applications

Abstract A new class of transparent graphene electrode based organic-inorganic halide perovskite photodetectors with broad spectral response is developed. These ultrasensitive devices exhibit high ON/OFF current ratio, high LDR, broad spectral range, excellent detection for weak light and easy fabrication with low-cost. Their semi-transparent feature and distinct photodetecting function for both sides would provide new applications affecting our daily lives.

Influence of electrical and thermal ageing on the mineral insulating oil performance for power transformer applications

2020 ◽  
Vol 62 (4) ◽  
pp. 222-231
Author(s):  
C Ranga ◽  
A Kumar ◽  
R Chandel
Keyword(s):  
Power Transformer ◽  
Stress Test ◽  
Oxidation Stability ◽  
Chemical Properties ◽  
Mineral Oil ◽  
Thermal Ageing ◽  
Test Cell ◽  
Transformer Oil ◽  
Power Transformers ◽  
Solid Dielectrics

In the present work, a new electrothermal combined stress test cell has been designed and fabricated to conduct accelerated electrothermal ageing. The fabricated test cell includes all possible real working conditions of the transformers. The effects of accelerated electrothermal ageing on the performance of power transformers with thermally upgraded Kraft (TUK), Nomex-910 and Nomex-410 solid dielectrics in conjunction with mineral oil have been investigated. The accelerated electrothermal ageing has been performed for a temperature range of 100°C to 220°C, along with 10 kV electrical stress. Subsequently, several electrical, thermal, mechanical and chemical properties of transformer oil and different paper dielectrics have been determined. It has been observed from the diagnostic test results that Nomex impregnated mineral oil samples have better electrothermal performance as well as oxidation stability when compared to the thermally upgraded Kraft oil samples. Therefore, Nomex insulating materials in conjunction with mineral oil are suggested as alternative solid dielectrics for power transformers in order to achieve better oxidation stability, improved thermal performance for long service runs and reduced operating and maintenance costs. It is envisioned that the present experimental study will be very beneficial to utility managers and end-users of power transformers.

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