کنفرانس بین المللی ماشین و محرکه های الکتریکی

صفحه اصلی / The 3rd International Conference on Electrical Machines and Drives

Investigation of Low-temperature Ethylene Production of Transformer Oil Using New IEC Method

نویسندگان :

Nima Ajodani-Zanjani¹ Hossein Karami² Gevork B.Gharehpetian³ Arash R. Khoshrou⁴

1- Tehran Power Transmission Maintenance Engineering Company (METANIR) Tehran, Iran 2- پژوهشگاه نیرو 3- Amirkabir University of Techonlogy 4- Aria Engineering Group

کلمات کلیدی :

Acidity،DGA interpretation،Power transformers،Stray gassing

چکیده :

The dissolved gas analysis (DGA) interpreting methods detect several irregularities in power transformers using the variation in levels and ratios of gases in transformer oil. Nevertheless, proving the correlation between gases levels and actual faults is challenging. One of the significant gas production sources is thermo-oxidative stray gases that lead to errors in DGA interpretation methods. This type of gas production is due to a chemical reaction independent of the internal faults of active parts. Recently, in IEC 60296, a new method has been presented to determine stray gassing characteristics. To investigate application of this method, this paper studies the DGA results of fifteen sister power transformers with excessive gas production. The most aged transformer oil and its reclaimed one are studied to show the effect of acidic by-products on stray gases production using the new IEC method. Moreover, two different new oils are studied using this method. Applying the new IEC method proves that ethylene should also be considered as a stray gas in addition to methane, ethane, and hydrogen.