Title :
Computation of very fast transient over-voltages (VFTO) in transformer windings
Author :
Gao Youhua ; Li Yanbin ; Ding Chunhong ; Wang Guogang
Author_Institution :
Sch. of Electr. Eng., Shenyang Univ. of Technol., Shenyang, China
Abstract :
A new method to calculate very fast transient over-voltages (VFTOs) in transformer windings has been presented. The applied algorithm uses a hybrid model which is a combination of the multi-conductor transmission line model (MTLM) and the single-transmission line model (STLM). The voltages at the end of each coil are calculated with the STLM model. Then, these values are used in the MTLM to determine the distributed over-voltages along the turns. Several representative curves with respect to time in transformer windings are illustrated. The maximums of over-voltage and electric field intensity generated in wire coils and in wire turns are also given. It is essential for transformer´s insulation design.
Keywords :
overvoltage; power transformers; transformer windings; distributed over-voltages; electric field intensity; multiconductor transmission line model; single-transmission line model; transformer insulation design; transformer windings; very fast transient over-voltages; Capacitance; Coils; Equations; Multiconductor transmission lines; Power system transients; Power transformer insulation; Surges; Transmission line matrix methods; Windings; Wire; Multi-conductor transmission line model (MTLM); Single-transmission line model (STLM); Transformer windings; Very fast transient over-voltages (VFTO);
Conference_Titel :
Electrical Machines and Systems, 2009. ICEMS 2009. International Conference on
Conference_Location :
Tokyo
Print_ISBN :
978-1-4244-5177-7
Electronic_ISBN :
978-4-88686-067-5
DOI :
10.1109/ICEMS.2009.5382903
