Comparative study for understanding the behaviour of natural ester with mineral oil as a transformer insulating liquid

2014 ◽  
Author(s):  
Kapila Bandara ◽  
Chandima Ekanayake ◽  
Tapan Kumar Saha
Keyword(s):  
Comparative Study ◽  
Mineral Oil ◽  
Insulating Liquid ◽  
Natural Ester

A review on critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: Part 1

2016 ◽  
Vol 23 (2) ◽  
pp. 873-880 ◽  
Author(s):  
Dhruvesh M. Mehta ◽  
P. Kundu ◽  
A. Chowdhury ◽  
V. K. Lakhiani ◽  
A. S. Jhala
Keyword(s):  
Critical Evaluation ◽  
Mineral Oil ◽  
Insulating Liquid ◽  
Natural Ester

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

A review of critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: Part II

2016 ◽  
Vol 23 (3) ◽  
pp. 1705-1712 ◽  
Author(s):  
Dhruvesh M. Mehta ◽  
P. Kundu ◽  
A. Chowdhury ◽  
V. K. Lakhiani ◽  
A. S. Jhala
Keyword(s):  
Critical Evaluation ◽  
Mineral Oil ◽  
Insulating Liquid ◽  
Natural Ester

scholarly journals Electrostatic Charging Tendency Analysis Concerning Retrofilling Power Transformers with Envirotemp FR3 Natural Ester

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4420 ◽  
Author(s):  
Maciej Zdanowski
Keyword(s):  
Mineral Oil ◽  
Volume Density ◽  
Point Of View ◽  
Pipe Material ◽  
Mineral Oils ◽  
Insulating Liquids ◽  
Electrostatic Charging ◽  
Tendency Analysis ◽  
Insulating Liquid ◽  
Natural Ester

Natural and synthetic esters are liquids characterized by insulating properties, high flash point, and biodegradability. For this reason, they are more and more often used as an alternative to conventional mineral oils. Esters are used to fill new or operating transformers previously filled with mineral oil (retrofilling). It is technically unfeasible to completely remove mineral oil from a transformer. Its small residues create with esters a mixture with features significantly different from those of the base liquids. This article presents electrostatic charging tendency (ECT) tests for mixtures of fresh and aged Trafo EN mineral oil with Envirotemp FR3 natural ester from the retrofilling point of view. Under unfavorable conditions, the flow electrification phenomenon can damage the solid insulation in transformers with forced oil circulation. The ECT of the insulating liquids has been specified using the volume density of the qw charge. This parameter has been determined using the Abedian–Sonin model on the basis of the electrification current measured in the flow system, as well as selected physicochemical properties of the liquids. It was shown that ECT is strongly dependent on the type of insulating liquid and pipe material, as well as the composition of the mixtures. The most important finding from the research is that a small amount (up to 10%) of fresh and aged mineral oil is effective in reducing the ECT of Envirotemp FR3 natural ester.

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