# 4.4 Voltage regulating transformer. Consider the following circuit in which the generator real and reactive power...

###### Question:

4.4 Voltage regulating transformer. Consider the following circuit in which the generator real and reactive power output is 100.0 MW and -50 MVAr respec- tively: the generator voltage is 1.02 pu; the transformer impedance is Zt = 0.01 + 0.15 pu on a base of 180 MVA; and the transformer off-nominal tap setting is t-1.05 pu. Calculate the voltage magnitude at the network terminals. til P+jQ ZE Network Figure 3: Problem 4.4 - Circuit calculation with transformer off-nominal taps. 4.5 Nodal current equation. Consider the power system network in Figure 4. Develop the circuit diagram of the network in which the circuit elements are represented by admittances in per-unit on a base of 100 MVA. Form the nodal current equation for node 2. The nodal current equations for the other network nodes are not required. For a particular operating condition = 1.020 and 12 = 1.05 29° Calculate the real and reactive power supplied by G1.
Network Item Parameters 500 MVA, 24 kV LI & L2 x, = 0.12 pu on 500 MVA, 24/275 kV, Off-nominal tap 1 = 1.05 pu 275 kV, 100 km line with R = 0.04 ohm/ph/km; X = 0.319 ohm/ph/km and B = 3.651 x 10S/ph km. 275 kV, 200 km parameters the same as for Ll& L2 L3 & 14 Figure 4: Problem 4.5 - Network for nodal current equation.

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