Mobile QR Code QR CODE : Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
Title A Study on the Impact of the Impedance Change of 345[㎸] Power Transformers on Overall System Performance
Authors Jeong-Hoon Shin ; Su-Chul Nam ; Jae-Gul Lee ; Sung-Muk Baek ; Ji-Young Song ; Tae-Kyun Kim
DOI http://dx.doi.org/10.5207/JIEIE.2011.25.8.140
Page pp.140-149
ISSN 1225-1135
Keywords Impedance ; Power Transformer ; Short-Circuit Current ; Voltage Stability Analysis
Abstract This paper deals with the impact analysis of the impedance change of 345/154[㎸] power transformers on the KEPCO system’s overall performance. Through the steady-state and dynamic analysis of power system, the maximum available impedance of power transformers were determined. Checking violation of short-circuit current ratings and transformer overload, parallel operation of power transformers, calculation of voltage variation ratio according to the impedance changes of power transformers are included in the steady-state analysis. In addition, transient and voltage stability analysis are also performed in the study. Available magnitudes to be able to change the impedance of the transformers in KEPCO system are finally determined in the paper.