Study Of Thermal Effect On Ester Oil Dielectric Stress Using Breakdown Measurements And Total Acid Number (TAN) Test

Zulkifli, Mohd Rodzi (2016) Study Of Thermal Effect On Ester Oil Dielectric Stress Using Breakdown Measurements And Total Acid Number (TAN) Test. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Study Of Thermal Effect On Ester Oil Dielectric Stress Using Breakdown Measurements And Total Acid Number (TAN) Test.pdf - Submitted Version Download (2MB)

Abstract

It is well known that power transformer service reliability is largely depending on the condition of the dielectric fluids. The influence of the thermal effect on the dielectric fluid will give important impact on the condition of the transformer themselves. In the real transformer consist of copper winding and pressboard paper that separated the transformer windings. This both materials will become dissolve particle in the insulating oil after long tem1 transformer operation. It can affect the dielectric perfo1mance of the insulating oil. This situation can be represents in the experiment by using copper strips and cellulose paper use in insulating oil. Ester oil as alternative oil need to be analyse it the1mal performance before applied in industry under this real transformer condition. This study investigates about the thermal effect on ester oil dielectric stress using breakdown voltage and total acid number test. The ester oil condition used is based on the real operating transformer with existing of copper strips and cellulose compared to other both ester oil conditions which is ester oil without particle and ester oil with copper strips. It is because to investigate the deterioration of the ester oil using the breakdown measurement and analyse the effect using total acid number. The entire sample undergoes thermal aging at l 20°C for 0, 6. 24 and 48 hours. The breakdown voltage test show that the ester oil for each condition has highest breakdown value during the beginning of the thermal aging and gradually dropped about 25% to 32% from its initial value after achieved 48 hours. While, the total acid number shown the vice versa that ester oil each condition experienced rising of the oil acidity about 60% to 106% from its initial value. Ester oil with cellulose and copper strips has the lowest breakdown voltage because the existing of the cellulose as the impurities that react as the bridging particle for the breakdown to happens quickly. While, for total acid number, ester oil with copper strips show the highest value due to the chemical reaction that make the copper strips react as the catalyst for process of oil oxidation. Relation between total acid number and breakdown voltage is higher the total acid number in the ester oil will cause low breakdown voltage. This is because the oil has been oxidized by acid that reduce the dielectric performance.

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