scholarly journals A comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral oil

2011 ◽  
Vol 18 (5) ◽  
pp. 1626-1637 ◽  
Author(s):  
Ruijin Liao ◽  
Jian Hao ◽  
George Chen ◽  
Zhiqin Ma ◽  
Lijun Yang
Keyword(s):  
Thermal Properties ◽  
Comparative Study ◽  
Mineral Oil ◽  
Natural Ester ◽  
Dielectric And Thermal Properties

A comparative study of thermal aging of transformer insulation paper impregnated in natural ester and in mineral oil

2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
Ruijin Liao ◽  
Shuaiwei Liang ◽  
Caixin Sun ◽  
Lijun Yang ◽  
Huigang Sun
Keyword(s):  
Comparative Study ◽  
Thermal Aging ◽  
Mineral Oil ◽  
Transformer Insulation ◽  
Natural Ester

Energetic isomers of bridged oxadiazole nitramines: the effect of asymmetric heterocyclics on stability and energetic properties

2021 ◽  
Vol 50 (38) ◽  
pp. 13286-13293
Author(s):  
Sicheng Liao ◽  
Tianlin Liu ◽  
Zhiyu Zhou ◽  
Kangcai Wang ◽  
Siwei Song ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Comparative Study ◽  
Energetic Properties

A series of asymmetric oxadiazole nitramine compounds were designed and synthesized, and a comparative study of detonation, sensitivity, and thermal properties of three oxadiazole nitramine isomers is made.

scholarly journals Investigation of Survival/Hazard Rate of Natural Ester Treated with Al2O3 Nanoparticle for Power Transformer Liquid Dielectric

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1510
Author(s):  
Raymon Antony Raj ◽  
Ravi Samikannu ◽  
Abid Yahya ◽  
Modisa Mosalaosi
Keyword(s):  
Survival Rate ◽  
Hazard Rate ◽  
Power Transformer ◽  
Mineral Oil ◽  
Interpolation Polynomial ◽  
Distribution Functions ◽  
Flash Fire ◽  
Predicted Values ◽  
Natural Ester ◽  
Electrical Apparatus

Increasing usage of petroleum-based insulating oils in electrical apparatus has led to increase in pollution and, at the same time, the oils adversely affect the life of electrical apparatus. This increases the demand of Mineral Oil (MO), which is on the verge of extinction and leads to conducting tests on natural esters. This work discusses dielectric endurance of Marula Oil (MRO), a natural ester modified using Conductive Nano Particle (CNP) to replace petroleum-based dielectric oils for power transformer applications. The Al2O3 is a CNP that has a melting point of 2072 °C and a low charge relaxation time that allows time to quench free electrons during electrical discharge. Al2O3 is blended with the MRO and Mineral Oil (MO) in different concentrations. The measured dielectric properties are transformed into mathematical equations using the Lagrange interpolation polynomial functions and compared with the predicted values either using Gaussian or Fourier distribution functions. Addition of Al2O3 indicates that 0.75 g/L in MRO has an 80% survival rate and 20% hazard rate compared to MO which has 50% survival rate and 50% hazard rate. Considering the measured or interpolated values and the predicted values, they are used to identify the MRO and MO’s optimum concentration produces better results. The test result confirms the enhancement of the breakdown voltage up to 64%, kinematic viscosity is lowered by up to 40% at 110 °C, and flash/fire points of MRO after Al2O3 treatment enhanced to 14% and 23%. Hence the endurance of Al2O3 in MRO proves to be effective against electrical, physical and thermal stress.

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