Decreasing Behavior of Acetylene in Oil-Immersed Transformers Takahiro Ohno, Member (Tokyo Electric Power Co.,Ltd.), Masami Katayama, Member, Toshi.tu
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1 Decreasing Behavior of Acetylene in Oil-Immersed Transformers Takahiro Ohno, Member (Tokyo Electric Power Co.,Ltd.), Masami Katayama, Member, Toshi.tugu Ishii, Member, Hideo Tsukioka, Member (Yuka Ind. Co.,Ltd.) In diagnosis of faults by means of dissolved gas analysis for oil-immersed transformers in service, acetylene gas generated owing to faults accompanied with high temperature such as arc or partial discharge is designated as a characteristic gas. Even if small quantities of acetylene gas are detected, successive monitoring frequency for the transformer is generally increased. It is reported that occasionally concentrations of acetylene gas dissolved in oil show decreasing behavior with operating time differing from other generated gases. Authors have taken notices of the behavior and made clear that it can be analyzed by the rate equation of first-order reaction, assuming that the behavior depends on a chemical reaction of acetylene gas to any material included in a transformer. We have had experiments using copper foils as a possible material reacting to acetylene and confirmed that the behavior of acetylene in transformers can be reproduced in a laboratory. We studied chemical bonds formed on the surface of the copper foil heated in oil dissolved acetylene gas using XPS. For exact calculations of quantities of acetylene gas generated abnormally, the reacting quantities of acetylene gas have to be taken in consideration. 54 T. IEE Japan, Vol. 119-B, No.1,'99
2 Table 1. Specifications of investigated transformers. Fig.2. Changes of concentrations of acetylene dissolved in oil of D and E transformers with operating time. Fig. 1. Changes of concentrations of acetylene dissolved in oil of A, B and C transformers with operating time.
3 Fig.3. Changes of concentrations of combus tible gases dissolved in oil of A transformer with operating time. Fig.5. Relations between operating time and logarithums of concentrations of acetylene dissolved in oil of A, B and C transformers. Fig.4. Changes of concentrations of combustible gases dissolved in oil of E transformer with operating time. Fig.6. Relations between operating time and logarithums of concentrations of acetylene dissolved in oil of D and E transformers. 56 T. IEE Japan, Vol. 119-B, No, l,'99
4 Fig.7. Apparatus for the experiment. Table 2. Conditions for the experiment.
5 Fig.8. Relation between heating time and concentration of acetylene dissolved in oil. Fig.10. Experimental results in case of using insulating paper winded copper conductors and non-polishing copper foils. Fig.9. Relation between 1/T and log k 58 T.IEE Japan, Vol. 119-B, No.1, '99
6 Fig. l1. C1s spectrum of a copper foil heated in acetylene gas atmosphere. Fig. 12. C1s spectrum of a copper foil heated in oil dissolving acetylene gas.
7 Fig.13. Relation between operating time and concentrations of acetylene dissolved in oil of A transformer, measured values, reacting quantities calculated from the formula and total quantities respectively. Fig. 15. Relation between operating time and calculated concentrations of acetylene dissolved in oil, measured values and reacting quantities, in case of fixed generating rates of acetylene. Fig.14. Relation between operating time and concentrations of acetylene dissolved in oil of E transformer, measured values, reacting quantities calculated from the formula and total quantities respectively. Fig.16. Relation between operating time and calculated concentrations of acetylene dissolved in oil, measured values and reacting quantities, in case of decrasing generating rates of acetylene. 60 T.lEE Japan, Vol. 119-B, No.1, '99
8 (3) K. N. Mathes: "Influence of Electrical Discharges in Oil and Combinations of Oil and Paper", IEEE, Vol.EI-11, No.4, P.164 (1976) (7) Borsi H., Schroder U.: "Grundlegende Untersuchungen zur Beurteilung der Gas-in-Ol-Analyse an mineral of gefullten Transformatoren" ETG Fachber, Vol.40, p.213 (1992)
9 (11) Duane A. Outka, C. M. Friend, Scott Jorgensen, R. J. Madix "Adsorption and Hydro genation of Acetylene on Cu(110) and Cu (110)-0 Surfaces", J. Am. Chem. Soc., Vol. 105, No.11, p (1983) (12) Neil R. Avery: "Adsorption and Reactivity of Acetylene on a Cu (110) Surface", J. Am. Chem. Soc., Vol. 107, p (1985) (13) Ts. S. Marinova, P. K. Stefanov: "Adsorption and thermal evolution of acetylene on a Cu(100) surface", Surface Sci.191, p. 66(1987) (15) K. Y. Yu, W. E. Spicer, I. Lindau, P. Pianetta, S. F. Lin:, "UPS Sutadies of the Bonding of H 2,02,C0,C2H4 and C2H2 on Fe and Cu", Surface Sci. 57, p. 157(1976) (18) G. Besmson, D. Briggs : High Resolution XPS of Organic Polymers the Sienta ESCA 300 Database, p. 278, John Wiley & Sons(1992) (19) IEC 567: "Guide for the sampling of gases and of oil from oil-filled electrical equipment and for the analysis of free and dissolved gases" (1992) 62 T. IEE Japan, Vol.119-B, No.1, '99
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