Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/0104-1428.20210040
Polímeros: Ciência e Tecnologia
Original Article

Development and evaluation of nitrile rubbers seals for power transformer application

Mauro Cesar de Avila; Ana Paula Munaro; Marilda Munaro

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Abstract

Mineral insulating oil (MIO) and natural ester insulating (NEI) oil are used in power transformers as an insulating fluid, while elastomeric seals are usually composed of nitrile rubber (NBR). The proprieties of these seals can change in contact with insulating oil. Variation in sealant properties is undesirable in power transformers. In this work, the variation of some elastomer properties was evaluated before and after accelerated aging in MIO and NEI. The developed elastomeric compositions showed variation in the stress and strain at break after the aging test. It also appeared that MIO penetrated the samples and that dioctylphthalate (DOP) migrated or was extracted into MIO and NEI. The samples vulcanized with peroxide showed better results than those vulcanized with sulfur.

 

 

Keywords

compatibility, mineral insulating oil, natural ester insulating, nitrile rubber, power transformers

References

1 Bandara, K., Ekanayake, C., & Saha, T. K. (2015). Modelling the dielectric response measurements of transformer oil. IEEE Transactions on Dielectrics and Electrical Insulation, 22(2), 1283-1291. http://dx.doi.org/10.1109/TDEI.2015.7076832.

2 Soares, V. R. (2015). Requisitos e restrições do uso do óleo vegetal de tungue como líquido isolante para transformadores elétricos de distribuição de média tensão (Dissertação de mestrado). Universidade Tecnológica Federal do Paraná, Cornélio Procópio.

3 Grison, É. C., Becker, E. J., & Sartori, A. (2010). Borrachas e seus aditivos: componentes, influências e segredos. Brazil: Letra & Vida.

4 Wang, Y. C., Wang, F. P., Li, J., Liang, S. N., & Zhou, J. H. (2018). Electronic properties of typical molecules and the discharge mechanism of vegetable and mineral insulating oils. Energies, 11(3), 523. http://dx.doi.org/10.3390/en11030523.

5 Ghani, S. A., Muhamad, N. A., Noorden, Z. A., Zainuddin, H., Bakar, N. A., & Talib, M. A. (2018). Methods for improving the workability of natural ester insulating oils in power transformer applications: a review. Electric Power Systems Research, 163(Pt B), 655-667. http://dx.doi.org/10.1016/j.epsr.2017.10.008.

6 Mehta, D. M., Kundu, P., Chowdhury, A., Lakhiani, V. K., & Jhala, A. S. (2016). A review of critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: part I. IEEE Transactions on Dielectrics and Electrical Insulation, 23(2), 873-880. http://dx.doi.org/10.1109/TDEI.2015.005370.

7 Martins, M. A. G. (2015). Óleo vegetal – um substituto do óleo mineral para uso em transformadores: revisão do estado da arte. Ciência e Tecnologia dos Materiais, 27(2), 136-142. http://dx.doi.org/10.1016/j.ctmat.2015.10.002.

8 Duin, N. M. V. (2020). Handbook of synthetic rubber. Germany: Optimal Media GmbH.

9 Garbim, V. J. (2013). Copolímeros Butadieno Acrilonitrila (NBR): características, compostos e aplicações. Sorocaba: Elastotec.

10 Clark, F. M. (1962). Insulating materials for design and engeneering practice. USA: John Wiley and Sons Ltd.

11 Eklund, M., Jarman, P., & Newesely, G. (2004). Transformer oil handbook. Sweden: Linderoths in Vingåker.

12 Kapgate, B. P., Das, C., Basu, D., Das, A., & Heinrich, G. (2015). Rubber composites based on silane-treated stober silica and nitrile rubber: interaction of treated silica with rubber matrix. Journal of Elastomers and Plastics, 47(3), 248-261. http://dx.doi.org/10.1177/0095244313507807.

13 Mehta, D. M., Kundu, P., Chowdhury, A., Lakhiani, V. K., & Jhala, A. S. (2016). A review of critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: part II. IEEE Transactions on Dielectrics and Electrical Insulation, 23(3), 1705-1712. http://dx.doi.org/10.1109/TDEI.2016.005371.

14 Zhu, L., Cheung, C. S., Zhang, W. G., & Huang, Z. (2015). Compatibility of different biodiesel composition with acrylonitrile butadiene rubber (NBR). Fuel, 158, 288-292. http://dx.doi.org/10.1016/j.fuel.2015.05.054.

15 Liu, Y., Wang, W. Y., Zhang, Z. X., Deng, T., & Xin, Z. X. (2011). Effects of blend ratio on rheology, morphology, mechanical and oil-resistant properties in chlorinated polyethylene rubber and copolyamide blends. Journal of Macromolecular Science, Part B: Physics, 50(9), 1659-1672. http://dx.doi.org/10.1080/00222348.2010.541852.

16 An, Y., Ding, Y., Tan, J., & Yang, W. (2011). Influences of polyester plasticizers on the properties of oil resistance flexible poly(vinyl chloride) and powder nitrile butadiene rubber blends. Advanced Science Letters, 4(3), 875-879. http://dx.doi.org/10.1166/asl.2011.1590.

17 An, Y., Yang, W. M., Ding, Y. M., Liu,Y., & Tan, J. (2010). Study on oil resistance properties of flexible PVC/PNBR blends. Advanced Materials Research, 87-88, 134-136. http://dx.doi.org/10.4028/www.scientific.net/AMR.87-88.134.

18 Wu, W., Wan, C., & Zhang, Y. (2013). Morphology and mechanical properties of ethylene‐vinyl acetate rubber/polyamide thermoplastic elastomers. Journal of Applied Polymer Science, 130(1), 338-344. http://dx.doi.org/10.1002/app.39046.

19 Abdelmalik, A. A. (2014). Chemically modified palm kernel oil ester: a possible sustainable alternative insulating fluid. Sustainable Materials and Technologies, 1-2, 42-51. http://dx.doi.org/10.1016/j.susmat.2014.06.001.

20 American Society for Testing and Materials – ASTM. (2016). ASTM D3182-16 - Standard Practice for Rubber—Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets. USA: ASTM International.

21 Associação Brasileira de Normas Técnicas – ABNT. (2013). NBR 14274- 2013 - Óleo mineral isolante – determinação da compatibilidade de materiais empregados em equipamentos elétricos. Rio de Janeiro: ABNT.

22 American Society for Testing and Materials – ASTM. (2005). ASTM D2240-05 - Standard test methods for rubber property: durometer hardness. West Conshohocken: ASTM International.

23 American Society for Testing and Materials – ASTM. (2006). ASTM D412-06 - Standard methods for vulcanized rubber and thermoplastic rubbers and thermoplastic elastomers: tension. West Conshohocken: ASTM International.

24 American Society for Testing and Materials – ASTM. (1999). ASTM D6370-99 - Standard Test Method for Rubber—Compositional Analysis by Thermogravimetry (TGA). West Conshohocken: ASTM International.

25 American Society for Testing and Materials – ASTM. (2018). ASTM E1640-18 - Standard Test Method for Assigment of thr glass transition temperature by dynamic mechanical análisis. West Conshohocken: ASTM International.

26 Dluzneski, P. R. (2001). Peroxide vulcanization of elastomers. Rubber Chemistry and Technology, 74(3), 451-492. http://dx.doi.org/10.5254/1.3547647.
 

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