Four-Leg Transformer with Defined Zero Sequence Impedance for Ground Fault Compensation

Mohsen Rezaei, Jakub Talla, Tomas Komrska, Zdenek Peroutka
2021 2021 International Conference on Applied Electronics (AE)   unpublished
Single-phase ground faults are the most common faults in medium-voltage distribution grids. High-impedance grid grounding using a special four-leg transformer is discussed in the paper. The transformer's zero-sequence impedance differs from positive-sequence impedance and it is designed to compensate the earth faults currents in Medium Voltage (MV) distribution grids when single-phase ground fault occurs. The designed transformer can replace the traditional arc suppression coils (ASC) in the
more » ... e where no distribution transformer neutral is available or distributed compensation is required. Alternatively, the transformer can operate in parallel with the ASC.
doi:10.23919/ae51540.2021.9542922 fatcat:3rulufdsy5a7tnjes7ne67rb2u