Title :
TRV under transformer limited fault condition and frequency-dependent transformer model
Author :
Koshizuka, Tadashi ; Nakamoto, Tetsuya ; Haginomori, Eiichi ; Thein, Myomin ; Toda, Hiroaki ; Hikita, Masayuki ; Ikeda, Hisatoshi
Author_Institution :
Toshiba Co., Kawasaki, Japan
Abstract :
The TRV amplitude factors of 4kVA and 300kVA transformers under transformer limited fault conditions were measured. The measured factors were 1.4 and were lower than the IEC standard. The frequency response of the transformer impedance was investigated using a frequency response analysis (FRA). FRA measurement graphs showed that the short-circuit inductance value of test transformers gradually decreases along with frequency. From this result, a frequency dependent transformer model was constructed. Simulated frequency response of transformer impedance was in good agreement with measured values. Simulated amplitude factor using frequency-dependent transformer model was 1.5 and is good agreement with measured values.
Keywords :
IEC standards; fault diagnosis; frequency response; power transformers; short-circuit currents; FRA measurement graphs; IEC standard; TRV; apparent power 300 kVA; apparent power 4 kVA; fault condition; frequency response; frequency response analysis; frequency-dependent transformer model; short-circuit inductance value; transformer impedance; Current measurement; Frequency measurement; Frequency response; Impedance; Impedance measurement; Inductance; Power transformers; frequency response analysis; transformer equivalent circuit; transformer limited fault; transient recovery voltage;
Conference_Titel :
Power and Energy Society General Meeting, 2011 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4577-1000-1
Electronic_ISBN :
1944-9925
DOI :
10.1109/PES.2011.6039099
