Symmetrical Components

Sequence Impedances and Networks of Synchronous Machine

Sequence Impedances and Networks of Synchronous Machine: Sequence Impedances and Networks of Synchronous Machine – Figure 10.11 depicts an unloaded synchronous machine (generator or motor) grounded through a reactor (impedance Zn). Ea,Eb and Ec are the induced emfs of the three phases. When a fault (not shown in the figure) takes place at machine terminals, currents …

Sequence Impedances and Networks of Synchronous Machine Read More »

Phase Shift in Star Delta Transformers

Phase Shift in Star Delta Transformers: Positive and negative sequence voltages and currents undergo a Phase Shift in Star Delta Transformers which depends upon the labelling of terminals. Before considering this phase shift, we need to discuss the standard polarity marking of a single-phase transformer as shown in Fig. 10.5. The transformer ends marked with …

Phase Shift in Star Delta Transformers Read More »

Symmetrical Component Transformation

Symmetrical Component Transformation: Symmetrical Component Transformation is given by a  set of three balanced voltages (phasors) Va,Vb,Vc is characterized by equal magnitudes and interphase differences of 120°. The set is said to have a phase sequence abc (positive sequence) if Vb lags Va by 120° and Vc lags Vb by 120°. The three phasors can …

Symmetrical Component Transformation Read More »