The Influence of Transformer Winding Connections on the Propagation of Voltage Sags

Voltage sag source location technology based on corresponding sequence components

“…However, the reverse direction of propagation is not significant [20,21]. Take the Chinese distribution system with 10/0.4 kV service transformer for example.…”

Grid interaction of MV-connected CHP-plants during disturbances

“…These unbalanced faults lead to unbalanced voltage dips. The propagation of voltage dips through different types of transformer connections results in a different appearance of voltage dips at the secondary side of the transformers [4]. Also neutral grounding can have a significant effect on voltage dip propagation [5].…”

“…In table I for various fault types and transformer connections the voltage dip propagation is shown. A detailed description of the results can be found in [4]. Table I shows that the voltage dip caused by a multi phase fault always propagates to the secondary line-voltage independent of the transformer connection.…”

Simulink Analysis of Vector Groups of Transformers Installed at 132kV Grid Station Qasimabad, Hyderabad and their Effects on System Operation

“…In electrical power system engineering, vector group is the method for characterizing the high tension (H.T) and low tension (L.T) windings connections of three phase transformers, which is being approved by international electro technical commission (IEC). In practice, the voltage measurements on two sides are used to deduce the vector group from the literature about the vector geometries [7][8]. In this paper the authors have fed the readings to a special purpose MATLAB Simulink Model of 132 kV grid station Qasimabad Hyderabad and confirm the exact vector groups and phase angles by means of simulation results.…”