The bus impedance matrix of a 3-bus system (in pu) is

A symmetrical fault (through a fault impedance of  ) occurs at bus 2. Neglecting pre-fault loading conditions, the voltage at bus 1 , during the fault is __________ pu (round off to three decimal places).

In the system shown below, the generator was initially supplying power to the grid. A temporary LLLG bolted fault occurs at F very close to circuit breaker 1. The circuit breakers open to isolate the line. The fault self-clears. The circuit breakers reclose and restore the line. Which one of the following diagrams best indicates the rotor accelerating and decelerating areas?

For a two-phase network, the phase voltages  and  are to be expressed in terms of sequence voltages  and  as . The possible option(s) for matrix S is/are

The two-bus power system shown in figure (i) has one alternator supplying a synchronous motor load through a  -  transformer. The positive, negative and zero-sequence diagrams of the system are shown in figures (ii), (iii) and (iv), respectively. All reactances in the sequence diagrams are in p.u. For a bolted line-to-line fault (fault impedance = zero) between phases '  ' and '  ' at bus 1 , neglecting all pre-fault currents, the magnitude of the fault current (from phase '  ' to '  ') in p.u. is _______ (Round off to 2 decimal places).

Fig. (i) : Single-line diagram of the power system

Fig. (iii) : Negative-sequence network Fig. (ii) : Positive-sequence network

Fig. (iv) : Zero-sequence network