TY - GEN
T1 - Influence of diode commutation processes on rectifier transformers operation
AU - Sikora, Andrzej
AU - Kulesz, Barbara
PY - 2010
Y1 - 2010
N2 - To obtain rectified voltage needed for d.c. traction networks, different types of energy transformation circuits may be used. This paper deals with 6- and 24-pulse transformer-rectified set operation under different supply condition. Commutation issues have been investigated for Yd transformer supplied with sinusoidal and distorted voltage. It has been shown that supply voltage THD factor affecting rectified voltage quality is not sufficient to examine voltage transformation extensively; phase angles of the harmonics have been researched as well and their impact on commutation processes presented. For 24-pulse system it has been shown that transformer windings connection scheme giving the desired phase shifts between secondary side voltages is not sufficient to achieve 24 pulses in rectified voltage. Due to commutation processes in uncontrolled diode bridges, this system produces 6 pulse output voltage only. In order to modernise traction substation, simple switchover from 3-phase to 12-phase transformer with presented windings connection is not, therefore, possible.
AB - To obtain rectified voltage needed for d.c. traction networks, different types of energy transformation circuits may be used. This paper deals with 6- and 24-pulse transformer-rectified set operation under different supply condition. Commutation issues have been investigated for Yd transformer supplied with sinusoidal and distorted voltage. It has been shown that supply voltage THD factor affecting rectified voltage quality is not sufficient to examine voltage transformation extensively; phase angles of the harmonics have been researched as well and their impact on commutation processes presented. For 24-pulse system it has been shown that transformer windings connection scheme giving the desired phase shifts between secondary side voltages is not sufficient to achieve 24 pulses in rectified voltage. Due to commutation processes in uncontrolled diode bridges, this system produces 6 pulse output voltage only. In order to modernise traction substation, simple switchover from 3-phase to 12-phase transformer with presented windings connection is not, therefore, possible.
KW - Commutation
KW - Multi-phase transformer
KW - Rectifier transformer
UR - https://www.scopus.com/pages/publications/78649598842
U2 - 10.1109/ICELMACH.2010.5608193
DO - 10.1109/ICELMACH.2010.5608193
M3 - Conference contribution
AN - SCOPUS:78649598842
SN - 9781424441754
T3 - 19th International Conference on Electrical Machines, ICEM 2010
BT - 19th International Conference on Electrical Machines, ICEM 2010
T2 - 19th International Conference on Electrical Machines, ICEM 2010
Y2 - 6 September 2010 through 8 September 2010
ER -