Analytical and new transmission line equivalent circuit modelling methods for swept frequency of power transformers

1994 ◽  
Author(s):  
N. Al-Khayat
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
Power Transformers ◽  
Modelling Methods ◽  
Circuit Modelling

scholarly journals Design of a randomised arrangement AMC surfaces for RCS reduction based on equivalent circuit modelling

2018 ◽  
Vol 12 (10) ◽  
pp. 1684-1690 ◽  
Author(s):  
Ali Ramezani Varkani ◽  
Zaker Hossein Firouzeh ◽  
Abolghasem Zeidaabadi Nezhad
Keyword(s):  
Equivalent Circuit ◽  
Circuit Modelling

Determination of the attenuation coefficients from the measured frequency characteristics of the windings of power transformers. Part 1. Theoretical consideration

2021 ◽  
Vol 1 (1) ◽  
pp. 13-22
Author(s):  
Vasily S. LARIN ◽  
◽  
Daniil A. MATVEEV ◽  
Keyword(s):  
Equivalent Circuit ◽  
High Frequency ◽  
Transfer Functions ◽  
Power Transformers ◽  
Reactive Component ◽  
Input Admittance ◽  
Vector Fitting ◽  
Transformer Winding ◽  
Resistive Component ◽  
High Frequency Resonance

To model high-frequency processes and determine the stresses on the internal insulation of transformer windings, reliable high-frequency models of power transformers are required. The accuracy of modeling high-frequency resonance processes in the windings depends on how correctly the model reproduces the natural frequencies and damping of free oscillations in the windings. To construct and verify high-frequency models of power transformers, it is necessary to have experimentally obtained data on the values of damping factors. There is a known method for determining the winding damping factors based on measurements of the voltage transfer functions at the internal points of the windings and their subsequent processing using the vector fitting technique, but its application is not always possible in practice. The article presents the results of theoretical studies performed for a simplified transformer winding equivalent circuit. It is shown that the damping factors can be estimated from the width of the resonance peaks of the frequency responses of the voltage modulus and reactive component at the midpoint of the equivalent circuit, and from the input admittance resistive component and current in the neutral of the considered resonance circuit.

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