Title :
Wave process in scale-down model of UHVDC converter transformer winding under the lightning impulse voltage
Author :
Pu, Z. ; Ruan, J. ; Zhang, Y. ; Du, Z. ; Xie, Q.
Author_Institution :
Sch. of Electr. Eng., Wuhan Univ., Wuhan, China
Abstract :
An experimental scale-down model of UHVDC converter transformer is designed and manufactured to study the wave process in the winding under impulse voltage. Nine outgoing lines are set up on the different winding coil of the scale-down model. The voltage waveforms of different outgoing lines are obtained by lightning impulse test. The simulation model of scale-down transformer is established to calculate the distributed parameter matrices by the finite element method. The equivalent circuit of transformer winding is proposed to calculate the node voltage waveforms and the potential gradient distribution. The comparative analysis of test and simulation results shows that the oscillating voltage occurs in the winding and the simulation results can reflect the wave process characteristics.
Keywords :
DC transformers; equivalent circuits; finite element analysis; matrix algebra; power convertors; transformer windings; UHVDC converter transformer winding; distributed parameter matrices; equivalent circuit; finite element method; lightning impulse test; lightning impulse voltage; node voltage waveforms; oscillating voltage; outgoing lines; potential gradient distribution; scale-down model; wave process; winding coil; Finite element analysis; Integrated circuit modeling; Lightning; Mathematical model; Power transformer insulation; Windings;
Conference_Titel :
Magnetics Conference (INTERMAG), 2015 IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7321-7
DOI :
10.1109/INTMAG.2015.7157207
