Investigation on thermal aging characteristics of vegetable oil-paper insulation with flowing dry air

被引：19

作者：

机构：

[1] State Key Laboratory of Power Transmission Equipment, System Security and New Technology, Chongqing University, Shapingba District

[2] China Electric Power Research Institute, Haidian District, Beijing

[3] High Voltage Laboratory, Department of Electrical and Computer Engineering, Mississippi State University, Mississippi State

[4] ABB Corporate Research

来源：

| 1649年 / Institute of Electrical and Electronics Engineers Inc., United States卷 / 20期

基金：

中国国家自然科学基金;

关键词：

flowing dry air; NOMEX paper; oil-paper insulation; open-style transformer; Thermal aging; vegetable oil;

D O I：

10.1109/TDEI.2013.6633695

中图分类号：

学科分类号：

摘要：

In order to investigate the thermal aging characteristics of oil-paper insulation in opentype transformers, a thermally accelerated aging experiment with flowing dry air is performed. The vegetable oil, NOMEX paper, pressboard, copper and silicon steel are sealed into the aging vessels and further aged, for 216 hours, by supply of flowing dry air at 170 °C. Several important parameters associated with the aging are observed and evaluated during the aging process. It is shown that the degree of polymerization (DP) of pressboard gradually decreases and fits well into the second-order kinematic model. Little deterioration of the NOMEX paper under 170 ° is confirmed by the tensile strength which stabilizes at a certain level after aging. In addition, the logarithm of the furfural concentration in oil is found to have a good linear relationship with DP of pressboard. Interestingly, when the aging time is about 150 hours and DP is 329, the aging process reaches an inflection point at which the DP approaches the leveling off degree of polymerization (LODP) value, the moisture content and the furfural content of oil begin to fall down while the acid number and the dissipation factor of oil increase with a faster rate. However, the viscosity of the fluid, one of the important parameters of transformer operation, does not change significantly. The obtained results demonstrate that exposure to air leads to serious oxidation of oil and rapid increase of acid and dissipation factor, and this way oxygen should be avoided for the open-type transformer filled with vegetable oil. © 1994-2012 IEEE.

引用

页码：1649 / 1658

页数：9

共 35 条

[1]

Saha T.K., Darveniza M., Yao Z.T., Hill D.J.T., Young G., Investigating the effects of oxidation and thermal degradation on electrical and chemical properties of power transformers insulation, IEEE Transactions on Power Delivery, 14, 4, pp. 1359-1367, (1999)

[2]

Liao R., Hao J., Chen G., Ma Z., Yang L., Comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral Oil, IEEE Trans. Dielectr. Electr. Insul, 18, 5, pp. 1626-1637, (2011)

[3]

Oommen T.V., Claiborne C.C., Walsh E.J., Baker J.P., New vegetable oil based transformer fluid: Development and verification, Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report, 1, pp. 308-312, (2000)

[4]

Oommen T.V., Vegetable oils for liquid-filled transformers, IEEE Electrical Insulation Magazine, 18, 1, pp. 6-11, (2002)

[5]

Yang L., Liao R., Caixin S., Zhu M., Influence of the vegetable oil on the thermal ageing of the transformer paper and its mechanism, IEEE Trans. Dielectr. Electr. Insul, 18, 3, pp. 692-700, (2011)

[6]

Jeong J.-I., An J.-S., Huh C.-S., Accelerated aging effects of mineral and vegetable transformer oils on medium voltage power transformers, IEEE Trans. Dielectr. Electr. Insul, 19, 9, pp. 156-161, (2012)

[7]

Asano Jr. R., Cheim L., Cherry D.B., Claiborne C.C., Bates L.C., Duart J.-C., Key E.W., Thermal evaluation of cellulosic board in natural ester fluid for hybrid insulation systems, 78th Annual int'L. Conf. Doble Clients, (2011)

[8]

Wilhelm H.M., Tulio L., Jasinski R., Aging markers for in-service natural ester-based insulating fluids, IEEE Trans. Dielectr. Electr. Insul, 18, 3, pp. 714-719, (2011)

[9]

Tenbohlen S., Koch M., Aging performance and moisture solubility of vegetable oils for power transformers, IEEE Trans. Power Delivery, 25, 2, pp. 825-830, (2010)

[10]

Saha T.K., Darveniza M., Hill D.J.T., Le T.T., Electrical and chemical diagnostics of transformers insulation- Part B: Accelerated aged insulation samples, IEEE Transactions on Power Delivery, 12, 4, pp. 1555-1561, (1997)

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