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This paper presents a field experience in condition monitoring of a power transformer using SFRA technique. A design based comparison approach of the SFRA test results is discussed in the paper. In order to verify the latest condition of the transformer, the SFRA test was complemented with DGA and PD tests. The SFRA test results indicated that there is an abnormality within the transformer windings...
An asset management tool using a simple technique for determination of maintenance priority level of medium voltage transformers is presented in this paper. Case studies during implementation of the decision tool on transformers with a decreased in oil quality are also discussed in this paper. Among the investigated cases, a transformer with a declined breakdown voltage and an excessive production...
Indonesian National Energy Policy states that renewable electricity generation shall contribute to around 10% of national grid by 2025. Currently, Indonesian grid capacity is just over 43 GW and estimated to reach over 65 GW by 2025 hence renewable generation target is around 6.5 GW. Indonesia is an archipelago country with over 13,700 islands stretches from east to west over three time zones. Renewable...
Results of PD tests in vegetable oil impregnated insulating system are discussed in this paper. The main objective of the study is to investigate the PD behaviour in the particular insulating systems at elevated temperature. Two different sample arrangements of electrical pressboard and insulating paper were used to simulate insulation defects. The sample was placed in a glass cell and was fully immersed...
This paper presents early result of an investigation of partial discharge (PD) properties in vegetable oil-impregnated insulating system. The laboratory experimental investigation simulated common fault conditions in vegetable oil-impregnated paper and pressboard insulating system. PD tests were carried out at elevated temperature to observe possible variation on PD behavior with temperature. In order...
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