Original scientific paper
Finite-Impulse- Response Modeling of Voltage Instrument Transformers Applicable for Fast Front Transients Simulations
Tomislav Plavšić
Abstract
This paper presents a method for Finite-Impulse-Response (FIR) modeling of voltage instrument transformers. The method is based on Wiener filtering
and measurement of the transformer response in the frequency domain using a low frequency network analyzer. The proposed method allows,
through digital filtering operation, an accurate simulation of the transformer response to transient excitation. Furthermore, the proposed approach to
the modeling of the system function allows unequal spacing of the frequency samples. The linearity of the transformer is analyzed applying the Fourier
analysis and different waveforms of the primary voltage, and methods for the model order selection, based on the generalized information criterion,
are discussed and applied. The theoretical analysis is confirmed with measurements in time domain, using the recurrent surge generator.
Keywords
transformer model; black-box; Wiener filetring; FIR filters; transfer function measurement; recurrent surge generator; lightning impulse
Hrčak ID:
211705
URI
Publication date:
1.5.2018.
Visits: 642 *