The effect of geomagnetically induced currents on the thermal conditions of power transformers

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• 作者：V. V. Vakhnina ; V. N. Kuznetsov ; V. A. Shapovalov
• 关键词：electric power system ; power transformer ; geomagnetically induced current ; active power losses
• 刊名：Russian Electrical Engineering
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：87
• 期：1
• 页码：53-58
• 全文大小：362 KB
• 参考文献：1.Pulkkinen, A., Hesse, M., Van der Zel, L., Damsky, B., Policelli, F., Fugate, D., and Jacobs, W., Solar shield: forecasting and mitigating space weather effects on high-voltage power transmission systems, Nat. Hazards, 2010, vol. 53, pp. 333–345.CrossRef
  2.Walling, R.A. and Kahn, A.N., Characteristics of transformer exciting–current during geomagnetic disturbances, IEEE Trans. Power. Deliv., 1991, no. 4, pp. 1707–1713.CrossRef
  3.Ko, C.-D. and Girgis, R.S., Analysis of cor-form transformer performance under the effects of geomagnetically induced currents, Proc. 53rd American Power Conf. Annu. Meeting, Chicago, 1992, vol. 54, part 2, pp. 1122–1125.
  4.Turovskii, Ya., Elektromagnitnye raschety elementov elektricheskikh mashin (Electromagnetic Calculations for Electrical Machines Elements), Moscow: Energoatomizdat, 1986.
  5.Vakhnina, V.V., Modelirovanie rezhimov raboty silovykh transformatorov sistem elektrosnabzheniya pri geomagnitnykh buryakh (The Way to Simulate Operation Conditions of Power Transformers for Power Supply Systems under Geomagnetic Storms), Togliatti: Togliatti State Univ., 2012.
  6.Panofsky, W.K.H. and Philips, M., Classical Electricity and Magnetism, Reading, MA: Addison-Wesley, 1962.MATH
  7.Leites, L.V., Elektromagnitnye raschety transformatorov i reaktorov (Electromagnetic Calculations for Transformers and Reactors), Moscow: Energiya, 1981.
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• 作者单位：V. V. Vakhnina (1)
  V. N. Kuznetsov (1)
  V. A. Shapovalov (1)
  
  1. Togliatti State University, Togliatti, Russia
  
• 刊物类别：Engineering
• 刊物主题：Manufacturing, Machines and Tools
  Russian Library of Science
  
• 出版者：Allerton Press, Inc. distributed exclusively by Springer Science+Business Media LLC
• ISSN：1934-8010

文摘

Methods to calculate the thermal processes and temperature of the most heated points of the tank and windings of a power transformer in conditions of flow of geomagnetically induced currents in grounded windings are developed. Dependences of additional loss in the tank and windings are obtained for a TRDN-63000/115/6.3/6.3 power transformer. It is shown that additional losses in power transformer windings are caused by the geomagnetically induced currents and depend on the first and nth harmonic components of magnetizing current, as well as on the load factor of a power transformer. The dependences of excess temperature of the most heated points of windings over ambient temperature on the geomagnetically induced current and load factor are determined. It is found that the excess temperature of the most heated point of winding over ambient temperature is also affected by the total additional loss of active power in the tank caused by the eddy currents at a geomagnetic storm. The acceptable load capacity of power transformers in geomagnetic storms with different intensities is determined in dependence on the ambient temperature. An increase in the load capacity of power transformers above set values in geomagnetic storms can lead to overheating of transformer windings and triggering of transformer gas protection, which will cause an electric power system to malfunction.