Performance of a Bio-based Hydrocarbon type Insulating Liquid

2021 ◽  
Author(s):  
Carl Wolmarans ◽  
Bruce Pahlavanpour ◽  
Robert Fairholm ◽  
Jayme Nunes
Keyword(s):  
Insulating Liquid

scholarly journals Controlling the breakup of toroidal liquid films on solid surfaces

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andrew M. J. Edwards ◽  
Élfego Ruiz-Gutiérrez ◽  
Michael I. Newton ◽  
Glen McHale ◽  
Gary G. Wells ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Mode Selection ◽  
Liquid Films ◽  
Solid Surfaces ◽  
Final States ◽  
Digital Microfluidic ◽  
Insulating Liquid ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Dynamics Stability

AbstractThe breakup of a slender filament of liquid driven by surface tension is a classical fluid dynamics stability problem that is important in many situations where fine droplets are required. When the filament is resting on a flat solid surface which imposes wetting conditions the subtle interplay with the fluid dynamics makes the instability pathways and mode selection difficult to predict. Here, we show how controlling the static and dynamic wetting of a surface can lead to repeatable switching between a toroidal film of an electrically insulating liquid and patterns of droplets of well-defined dimensions confined to a ring geometry. Mode selection between instability pathways to these different final states is achieved by dielectrophoresis forces selectively polarising the dipoles at the solid-liquid interface and so changing both the mobility of the contact line and the partial wetting of the topologically distinct liquid domains. Our results provide insights into the wetting and stability of shaped liquid filaments in simple and complex geometries relevant to applications ranging from printing to digital microfluidic devices.

Deep Levels Induced by High Fluence Proton Irradiation in Undoped GaAs Diodes

1997 ◽  
Vol 487 ◽  
Author(s):  
A Castaldini ◽  
A Cavallini ◽  
L Polenta ◽  
C Canali ◽  
F Nava ◽  
...  
Keyword(s):  
Proton Irradiation ◽  
High Energy ◽  
Deep Levels ◽  
Induced Current ◽  
High Fluence ◽  
High Fluences ◽  
Electron Beam Induced Current ◽  
Insulating Liquid ◽  
Undoped Gaas ◽  
Scanning Electron

AbstractSemi-insulating liquid encapsulated Czochralski grown GaAs has been investigated after irradiation at high fluences of high-energy protons. Electron beam induced current observations of scanning electron microscopy evidenced a radiation stimulated ordering. An analysis has been carried out of the deep levels associated with defects as a function of the irradiation fluence, using complementary current transient spectroscopies. By increasing the irradiation fluence, the concentration of the native traps at 0.37 eV together with that of the EL2 defect significantly increases and, at the same time, two new electron traps at 0.15 eV and 0.18 eV arise and quickly increase in density.

Effect of Water on Electrical Properties of Refined, Bleached, and Deodorized Palm Oil (RBDPO) as Electrical Insulating Material

2013 ◽  
Vol 64 (4) ◽  
Author(s):  
Nazera Ismail ◽  
Yanuar Z. Arief ◽  
Zuraimy Adzis ◽  
Shakira A. Azli ◽  
Abdul Azim A. Jamil ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Breakdown Voltage ◽  
Palm Oil ◽  
Pour Point ◽  
Electrical Breakdown ◽  
Dissipation Factor ◽  
Mineral Oil ◽  
Flash Point ◽  
Effect Of Water ◽  
Insulating Liquid

This paper describes the properties of refined, bleached, deodorized palm oil (RBDPO) as having the potential to be used as insulating liquid. There are several important properties such as electrical breakdown, dielectric dissipation factor, specific gravity, flash point, viscosity and pour point of RBDPO that was measured and compared to commercial mineral oil which is largely in current use as insulating liquid in power transformers. Experimental results of the electrical properties revealed that the average breakdown voltage of the RBDPO sample, without the addition of water at room temperature, is 13.368 kV. The result also revealed that due to effect of water, the breakdown voltage is lower than that of commercial mineral oil (Hyrax). However, the flash point and the pour point of RBDPO is very high compared to mineral oil thus giving it advantageous possibility to be used safely as insulating liquid. The results showed that RBDPO is greatly influenced by water, causing the breakdown voltage to decrease and the dissipation factor to increase; this is attributable to the high amounts of dissolved water.

scholarly journals Optimizing characteristics in mineral insulating oil used in high power transformers

2019 ◽  
pp. 222-228
Author(s):  
Irina Alina Chera Anghel ◽  
Loredana Popescu
Keyword(s):  
Mineral Oil ◽  
The Other ◽  
Power Transformers ◽  
Anaerobic Conditions ◽  
Mineral Oils ◽  
Insulating Liquid ◽  
Different Characteristics ◽  
Aerobic And Anaerobic ◽  
Good Heat ◽  
Aerobic And Anaerobic Conditions

The most commonly used insulating liquid in transformers is mineral oil. Special synthetic applications such as silicone, ester, perchloroethene, etc. are used today in special applications, with different characteristics, very low or nonexistent toxicity to mineral oils used in transformers. On the other hand, they have a much better biodegradability than mineral oils in both aerobic and anaerobic conditions. But they cannot directly replace the mineral oil in operation or in repaired units. They have dielectric properties and good heat transfer but have limited their use to special transformers due to the relatively high cost and availability.

scholarly journals Fire resistance test of transformers filled with natural ester insulating liquid

2019 ◽  
Vol 2019 (16) ◽  
pp. 1560-1564 ◽  
Author(s):  
Shengwei Cai ◽  
Cheng Chen ◽  
Huihao Guo ◽  
Shaobing Chen ◽  
Zandong Zhou ◽  
...  
Keyword(s):  
Fire Resistance ◽  
Resistance Test ◽  
Fire Resistance Test ◽  
Insulating Liquid ◽  
Natural Ester

Stable operation of topografiner in the atmosphere by use of charge injection current in an insulating liquid

1990 ◽  
Vol 23 (1-3) ◽  
pp. 954-957
Author(s):  
Hiroshi Adachi ◽  
Atsushi Suzuki ◽  
Tadashi Onodera ◽  
Kazuo Suzuki ◽  
Kouichi Mukasa
Keyword(s):  
Charge Injection ◽  
Injection Current ◽  
Stable Operation ◽  
Insulating Liquid

Effect of Waste Vegetable Oil on Cooling Performance and Lifetime of Power Transformers

2020 ◽  
Author(s):  
Ehsan Ebrahimnia-Bajestan ◽  
Mohammad Arjmand ◽  
Hani Tiznobaik
Keyword(s):  
Magnetic Energy ◽  
Power Transformer ◽  
Mineral Oil ◽  
Power Transformers ◽  
Cooling Performance ◽  
Mineral Oils ◽  
Waste Vegetable Oil ◽  
Lower Viscosity ◽  
Insulating Liquid ◽  
Main Factor

Abstract During the operation of a power transformer, a large amount of heat is generated due to the electrical and magnetic energy losses in its core and windings, causing a temperature rise in transformers. This generated heat is known as the main factor for aging the electrical insulating system of a transformer. In this research, we numerically studied the ability of a vegetable-based oil — as an alternative coolant for the petroleum-based oils — on the cooling performance of a power transformer. The studied oil was a biodiesel produced from waste cooking vegetable oils, having lower viscosity compared to traditional mineral oils. We also calculated the aging rate of the transformer in the presence of the biodiesel. The results indicated that compared to the mineral oil, the average hotspot temperature of the transformer is 3 degrees lower when the biodiesel was used. The life expectancy of the transformer with the vegetable-based oil was also significantly longer than the case with mineral oil. In conclusion, this study provided a sustainable way to use an eco-friendly material produced from a waste resource as an alternative insulating liquid for the cooling of power transformers.

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