Calculation of Parasitic Capacitance of Foil Winding Dry-type Power Transformer

Power transformers are critical components in the entire grid and are the bridges that connect different voltage levels. At the same time, harmonic pollution has become an essential factor in grid power pollution. It is a serious issue to curb harmonics into the public network and improve power quality. In the process of harmonic transmission, it is necessary to experience this part of the transformer. Therefore, this subject has established an important high-frequency equivalent circuit of the transformer through the study of the high-frequency parameters of the transformer, which has important practical significance for the filtering of harmonics. In this paper, the parasitic capacitance of the foil winding for low voltage side of the dry-type double-split power transformer model studied using the analytical method. According to the specific structure of the transformer, some of the circuits are adjusted to build a relatively accurate high-frequency equivalent circuit. Finally, the harmonics of the harmonic source AC/DC are analyzed to analyze the harmonic components in the waveform. Based on the previously established model, the impedance characteristics of the circuit in the frequency band of the harmonics explored.