Predicting transformer end of life using transformer thermal life simulation technique

• Main Author: Muftah Saad, Ferass A.
• Format: Thesis
• Language: English; English; English
• Published: 2011
• Subjects: TK Electrical engineering. Electronics Nuclear engineering; TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
• Online Access: http://eprints.uthm.edu.my/2622/1/24p%20FERASS%20A.%20MUFTAH%20SAAD.pdf; http://eprints.uthm.edu.my/2622/2/FERASS%20A.%20MUFTAH%20SAAD%20COPYRIGHT%20DECLARATION.pdf; http://eprints.uthm.edu.my/2622/3/FERASS%20A.%20MUFTAH%20SAAD%20WATERMARK.pdf; http://eprints.uthm.edu.my/2622/

Large power transformers are key components in power system networks and their correct functioning is vital to system operation. Transformer failures can have enormous impact on security and reliability of supply and cost. In addition, Power transformers ageing are one of the critical issues utilities are facing, since a large number of units are approaching or have exceeded their designed lifetime. Their replacement will involve a considerable amount of time and cost. Therefore, developing a replacement strategy for aged transformer populations is crucial. This theses presents simulation technique for life assessment of the insulation of the distribution transformer. Load and ambient temperatures are two important factors that influence the life of insulation in transformers. The estimated load factors and ambient temperatures are input to the IEC life consumption models to assess the consumed life of insulation. The simulation is based on IEC 60076-7 Revision 2005 thermal model. Sumer and winter load profiles and ambient temperatures of the transformer in Libya Electricity Company are used as the input for the simulation together with transformer parameters from the heat run test. Hottest spot temperature and loss-of-life are calculated. Besides the temperature, the moisture factor also has been introduced in loss of life calculation.