TY - GEN
T1 - Shunt capacitance influences on single-phase transformer FRA spectrum
AU - Bagheri, Mehdi
AU - Phung, B. T.
AU - Blackburn, Trevor
AU - Naderian, Ali
PY - 2013
Y1 - 2013
N2 - Frequency response analysis (FRA) is considered as an accurate, fast, effective and sensitive method for detection of mechanical defects within power transformers, providing worthy information on active part structure. FRA measurement has been industrialized and employed since the last decade while FRA spectrum interpretation is still under development. The interaction of distributed resistances, series and shunt capacitances as well as self- and mutual-inductances in transformer winding leads to FRA spectrum oscillations. In fact, each and every parameter has its own impact on this spectrum. This study has concentrated on shunt capacitance influences on frequency response spectrum oscillations in Bode diagram. Shunt capacitance impacts on low-, mid- and high-frequency bands of FRA spectrum are discussed. A practical study on a single phase air-core glassy model transformer is carried out to explore the influence of shunt capacitances of HV and LV windings with respect to the transformer tank on FRA spectrum. In addition, a single phase 11/0.25 kV, 25 kVA core type distribution transformer is also tested to evaluate the shunt capacitance impacts on FRA fluctuations.
AB - Frequency response analysis (FRA) is considered as an accurate, fast, effective and sensitive method for detection of mechanical defects within power transformers, providing worthy information on active part structure. FRA measurement has been industrialized and employed since the last decade while FRA spectrum interpretation is still under development. The interaction of distributed resistances, series and shunt capacitances as well as self- and mutual-inductances in transformer winding leads to FRA spectrum oscillations. In fact, each and every parameter has its own impact on this spectrum. This study has concentrated on shunt capacitance influences on frequency response spectrum oscillations in Bode diagram. Shunt capacitance impacts on low-, mid- and high-frequency bands of FRA spectrum are discussed. A practical study on a single phase air-core glassy model transformer is carried out to explore the influence of shunt capacitances of HV and LV windings with respect to the transformer tank on FRA spectrum. In addition, a single phase 11/0.25 kV, 25 kVA core type distribution transformer is also tested to evaluate the shunt capacitance impacts on FRA fluctuations.
KW - Frequency response analysis
KW - Shunt capacitance
KW - Transformer diagnosis
KW - Transformer winding deformation
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U2 - 10.1109/EIC.2013.6554238
DO - 10.1109/EIC.2013.6554238
M3 - Conference contribution
AN - SCOPUS:84883795034
SN - 9781467347389
T3 - 2013 IEEE Electrical Insulation Conference, EIC 2013
SP - 225
EP - 229
BT - 2013 IEEE Electrical Insulation Conference, EIC 2013
T2 - 31st Electrical Insulation Conference, EIC 2013
Y2 - 2 June 2013 through 5 June 2013
ER -