Thermal condition assessment of power transformer

Abstract

Transformer condition should be maintained because of its importance to electricity network. Each utility, in this case PLN P3B Jawa -Bali, has to assure their reliability in order to maintain electrical power system stability by assessing transformer conditions. Once transformer condition attained, appropriate maintenance and operation strategy can be defined. The most important things influence transformer condition is its insulation. Since transformer insulation is also influenced by thermal stress, another stresses also influence insulation condition i.e. chemical, electrical and mechanical stress. We calculate FAA (Factor Accelerated Aging) of the transformer by estimating Hot Spot from Top Oil temperature. Calculated FAA is correlated to Dissolved Gasses Analysis (DGA) and Oil Quality Analysis (OQA). Data used were taken from 150/20 kV 60 MVA power transformer from the year of 2007 until 2008.

Effects of Ethanolic Extract of Arrowroot Tubers (Maranta Arundinacea L.) on the Level of Mda, SGPT and Sgot in Ethanol Induced Rats

“…If the concentration of SGPT and SGOT enzymes increase, then the degree of damage occured in the liver cells might be higher as well. 17 Cell membrane damage would cause the SGOT enzyme to exit from the cytoplasm, thus its number in the blood would increase. Hence, it could be used as an indicator of liver damage.…”