FURTHER CONTRIBUTION FOR EVALUATING THE AGING OF TRANSFORMER OIL OF POWER TRANSFORMER | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 3, Volume 43, No 2, March and April 2015, Page 211-226 PDF (1.18 MB) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2015.115168 | ||||
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| Authors | ||||
| Sobhy S. Dessouky1; Adel El Faraskoury2; Sherif Ghoneim3; Ahmed Haassan3 | ||||
| 1Electrical Power and Machines Department. Port Said University, Port Said | ||||
| 2Extra High Voltage Research Centre, Egyptian Electricity Holding Company, Cairo, Egypt | ||||
| 3Electrical Power Department, Suez University, Suez | ||||
| Abstract | ||||
| Transformers are essential parts in the power system for voltage level conversion and maintaining the power flow in the electrical power system, the stability of which is significant for the reliability of the whole supply. The oil used in all transformers is used for insulating and cooling purposes. Degradation of transformer oil occurs because of the ageing, high temperature and chemical reactions such as the oxidation. It is also affected by contaminants from the solid materials. Therefore, the oil condition must be checked regularly and reclaimed or replaced periodically, to avoid the sudden failure of the transformer. In this paper, breakdown voltages (BDV) as well as dielectric dissipation factor (Tan δ) at some different oil conditions are measured. The effect of temperature variation, particle existence in the oil and the water content are studied. The results explain that the aged oil at 80oC (heated for two hours) provides a good dielectric strength than that fresh oil. The particles in the oil play an important part for decreasing the BDV as well as giving worst value of tan δ. | ||||
| Keywords | ||||
| transformer; Mineral oil; Breakdown Voltage (BDV); Dielectric Dissipation Factor (tan δ); and water content | ||||
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