![]() At the stage of transformer insulation design and during design review within procurement process, it is extremely important to use high-frequency numerical models verified by comparison with experimental data.įor the development and verification of high-frequency power transformer models, experimental data regarding natural frequencies and damping factors of free oscillations inside windings is needed first. One of the possible measures to ensure the ability of transformer windings insulation to withstand operation high-frequency overvoltages is the application of high-frequency transformer models in order to determine dielectric stresses on windings internal insulation. Under unfavorable conditions, when oscillation frequency is close to one of transformer winding natural frequencies, resonant overvoltages inside the winding can develop which leads to overstressing of windings internal insulation and the risk of transformer damage. ![]() Power transformers switching together with cable lines in renewable generation systems can be followed by high-frequency voltage oscillations affecting the insulation of that transformers.
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