Estimation of power transformer remaining life from activation energy and pre-exponential factor in the Arrhenius equation
| Autor: | Behrooz Vahidi, Ashkan Teymouri |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Arrhenius equation
Polymers and Plastics Pre-exponential factor 02 engineering and technology Activation energy Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology Kinetic energy 01 natural sciences 0104 chemical sciences law.invention Reaction rate symbols.namesake Remaining life law symbols 0210 nano-technology Transformer Mathematics |
| Zdroj: | Cellulose. 26:9709-9720 |
| ISSN: | 1572-882X 0969-0239 |
| DOI: | 10.1007/s10570-019-02746-w |
| Popis: | In 1936, Ekenstam derived an equation for cellulose ageing kinetic that linked DP to life and reaction rate. Later, Arrhenius obtained an equation that linked reaction rate to temperature, activation energy and coefficient A. Then, using these equations, the transformer life estimation has become possible. Activation energy is usually considered a constant value, but coefficient A depends on moisture and oxygen concentrations inside the transformer. So far, constant values for these factors have been used, but the transformer condition is constantly changing. In this paper, a new method is proposed for calculating activation energy and coefficient A for any transformer at any time according to the transformer condition for precise life estimation. Finally, for ten transformers with available data, life estimation is performed using the proposed method at the startup time of the transformers. Then, calculation results are compared with the transformer actual life to ensure the accuracy of the proposed method. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink