摘要
To study the Very Fast Transient Over-voltage (VFTO) distribution in transformer windings in gas insulated substation (GIS), a systematic methodology based on S-parameters is presented for establishing high-frequency model of transformer windings. Firstly, voltage transfer functions are derived from S-parameters which are calculated or measured from transformer windings. Secondly, voltage transfer functions are fitted with rational functions by the vector fitting method and then the rational transfer functions are order-reduced by optimal Pade-approximation algorithm. Lastly, the resultant voltage transfer functions are synthesized by network technology. Computational results are consistent with simulation results of Electromagnetic Transient Program (EMTP) and confirm the feasibility and validity of proposed methodology.
To study the Very Fast Transient Ove-voltage （VFTO） distribution in transformer windings in gas insulated substation （GIS）, a systematic methodology based on S-parameters is presented for establishing high-frequency model of transformer windings. Firstly, voltage transfer functions are derived from Sparameters which are calculated or measured from transformer windings. Secondly, voltage transfer functions are fitted with rational functions by the vector fitting method and then the rational transfer functions are order reduced by optimal Pade-approximation algorithm. Lastly, the resultant voltage transfer functions are synthesized by network technology. Computational results are consistent with simulation results of Electromagnetic Transient Program （EMTP） and confirm the feasibility and validity of proposed methodology.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2008年第9期1898-1904,共7页
High Voltage Engineering
基金
the I mportant National Science Foundation of Hebei Province (E2006001036)
Science and Tech-nology Project of Hebei Province (072156167)
关键词
过电压
瞬变电流
变压器绕组
电压转移法
VFTO
S-parameters
multi-conductor transmission line
vector fitting method
optimal Pade order-reduced algorithm
power transformer
