A Monitoring Method for Average Winding and Hot-Spot Temperatures of Single-Phase, Oil-Immersed Transformers

GEZEGİN C., Özgönenel O., DİRİK H.

IEEE TRANSACTIONS ON POWER DELIVERY, cilt.36, sa.5, ss.3196-3203, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 5
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1109/tpwrd.2020.3035842
  • Dergi Adı: IEEE TRANSACTIONS ON POWER DELIVERY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.3196-3203
  • Anahtar Kelimeler: Windings, Oil insulation, Power transformer insulation, Resistance, Temperature, Oils, Temperature sensors, Average winding temperature (AWT), hot spot factor (HSF), hot spot temperature (HST), top oil temperature (TOT), monitoring, finite element method (FEM), POWER TRANSFORMERS
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

Transformers are the most expensive element of a power system, and so transformer monitoring systems are becoming more important as loads increase. Under heavy loading conditions, the hot-spot temperature of a transformer is the most critical parameter to determine the limit of loading. Therefore, to make an accurate estimation of hot-spot temperature and maintain the reliability of a power system, dynamic thermal models or methods must be employed. Due to the complexity of thermal phenomena, the methods presented so far needs to be improved to reduce computational errors. This is particularly the case for variable loading conditions and power utilities are still in need of good techniques. This paper describes two methods to determine temperature in single-phase, oil-immersed transformers. The first method calculates average windings temperature (AWT) using the voltage and current from primary and secondary windings. The second method, which uses data from the first method, determines the hot-spot temperature of the transformer. The methods have been investigated by experiments on a 30 kVA single-phase transformer and verified the results using COMSOL (TM) software. Our methods have proven more accurate than the IEEE Annex G method.