Abstract
An inrush current is generated when a transformer is energized. This current has a large magnitude and rich harmonics, thereby causing mal-operation of the protection relay. Therefore, the development of countermeasures against inrush current is necessary, and this study has been performed by computer simulations. However, it is difficult for a power system operator to perform a computer simulation as it is difficult to determine what data should be selected and entered. Therefore, this paper establishes the simulation process of transformer inrush current using the Electromagnetic Transients Program (EMTP). Two methods to simulate the transformer inrush current are described in detail. Based on the actual 154 kV transformer test report in Korea, the simulation results of the inrush current using the two methods are discussed.
Highlights
Transformers are essential components of power systems
Calculation of Leakage Impedance Using the Results in Test Report
The values required for the Electromagnetic Transients Program (EMTP) model are the actual values shown in the green box
Summary
Transformers are essential components of power systems. Energization of the transformer is necessary for the operation of power systems. When the transformer is energized, an inrush current of large magnitude and rich harmonics is generated. This current adversely affects the power system causing a reduction in the lifetime of the transformer, damage, and mal-operation of the protective relay. Several studies have been carried out on the inrush current of a transformer to counteract these adverse effects. References [1,2,3,4,5] studied the discrimination strategies between transformer faults and inrush current. [6,7,8,9] studied the controlled energization of transformers, while [10,11]
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