For the system from Problem 6.30, assume that a 75-Mvar shunt capacitance (three phase assuming one per unit bus voltage) is added at bus 4 . Calculate the new value of \(\mathrm{Y}_{44}\). 6.5}

Problem 6.30

Determine the bus admittance matrix ( \(\boldsymbol{Y}_{\text {bus }}\) ) for the three-phase power system shown in Figure 6.23 with input data given in Table 6.11 and partial results in Table 6.12

. Assume a three-phase 100 MVA per unit base.

Table 6.11)

Table 6.12)

North South (1) 1 (1) 2 Lake 3 Elm Main 5 4