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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
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Title A Study on Main Protection Method for Three-Winding Power Transformer System
Authors Chul-Won Park
DOI http://doi.org/10.5207/JIEIE.2023.37.4.088
Page pp.88-97
ISSN 1225-1135
Keywords Excitation inrush; Inverter-based VRE; Main protection; Percentage differential relay; PSCAD; Three-winding power transformer; Transient analysis
Abstract Recently, the fault characteristics of inverter-based VRE (Variable Renewable Energy) power supplies, which are increasing, are different from those of synchronous power sources. The concerns have been raised about malfunctions of existing protection methods. The detailed transient analysis such as FFT (Fast Fourier Transform), waveform identification, and fault type classification considering the characteristics of the future hybrid power grid should be preceded. In this paper, as a preceding study for a power system in which an inverter-based power source is connected, the main protection method of IED (Intelligent Electronic Device) for three-winding transformer is analyzed.