Title :
The setup of high frequency circuit model for current transformer
Author :
Zhang Zhongyuan ; Liang Guishu ; Cui Xiang ; Wu Maolin
Author_Institution :
Dept. of Electr. Eng., North China Electr. Power Univ., Baoding, China
Abstract :
A circuit model to simulate the high frequency behavior (0.1-15 MHz) of an inductive current transformer (CT) is presented. This model is based on the frequency characteristics between its terminals over a given range of frequency obtained by measurement. The transfer function model for the PT (potential transformer) is approximated with rational functions by means of vector fitting. A special method of RLC synthesis for the transfer function is used to build the circuit model of the CT. This high frequency circuit model can be used to calculate the disturbing voltage in the secondary circuit caused by transients in the primary through capacitive coupling in an air insulated substation (AIS).
Keywords :
current transformers; electromagnetic compatibility; equivalent circuits; frequency response; potential transformers; transfer functions; transients; 0.1 to 15 MHz; EMC problem; RLC synthesis; air insulated substation; capacitive coupling; circuit model; current transformer; equivalent circuit parameters; frequency characteristics; frequency response; high frequency circuit model; inductive current transformer; potential transformer; rational functions; transfer function model; transients; vector fitting; Circuit simulation; Circuit synthesis; Coupling circuits; Current transformers; Frequency measurement; Frequency synthesizers; Insulation; RLC circuits; Transfer functions; Voltage transformers;
Conference_Titel :
Environmental Electromagnetics, 2003. CEEM 2003. Proceedings. Asia-Pacific Conference on
Conference_Location :
Hangzhou, China
Print_ISBN :
7-5635-0802-3
DOI :
10.1109/CEEM.2003.238063
