High frequency transformer model for calculations of
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High frequency transformer model for calculations of
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International Colloquium on Lightning and Power systems
INSA LYON France
High frequency transformer model for calculations of transferred overvoltages B. JURISIC*, A. XEMARD EDF R&D, France
I. UGLESIC University of Zagreb, Croatia
F. PALADIAN University Blaise Pascal, France
SUMMARY Equipment in the power grid have to be protected against overvoltages. Lightning or some switching operations can cause high frequency overvoltages. The choice of the rules adapted at design stage regarding insulation coordination is usually based on Electromagnetic transient simulations (EMTP), therefore it is particularly important to model properly apparatuses. Since transformer behavior at high frequencies is mainly dependent on its capacitances, classical, low frequency transformer models cannot be used for high frequency transient simulations. Therefore, some other models have to be developed. Nevertheless, nowadays high frequency models of the transformer which are compatible with the EMTPlike tools are neither standardized nor easy to use. In this paper an overview of a complete procedure for establishing a state of the art transformer model for high frequency based on terminal measurement is given. Procedure includes measurements of the scattering parameters of the transformer, calculation of transformer admittance matrix, rational approximation and usage of the state space equation block in EMTP-RV. The developed model represents a transformer as a black box and is suitable for calculation of transferred high frequency overvoltages through a transformer. A case study is included in the paper. KEYWORDS Transformer - “Black Box” Model - Transient Simulation - Rational Approximation - State Space Equation - Scattering Parameter - Electromagnetic Transient Program (EMTP)
