Transformer Modeling Based on Standard Frequency Response Measurements
نویسندگان
چکیده
High frequency models of large power transformers are required for analysis of transient interaction phenomena between transformers and the power system. Fast transient overvoltages may lead to transformer dielectric failures. Deeper understanding of the mechanisms may help to take actions against possible damages. This paper describes the simulation principle of transient interaction in matters of a transformer in several steps discriminating between internal and external aspects of simulation and analysis. The three main approaches of transformer high frequency modelling, black box, white box and grey box are compared and two different measurement strategies are discussed. An impedance estimation which is based on standard frequency response measurements was successfully tested with two distribution transformers. Index Terms Power Transformer, Transients, Modelling, Vector Fitting, Frequency Response Measurement, Black box, White box, Grey box
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