In the above figure, a single line model of a three-phase power system is given. Base power 50MVA, base voltage 13.8kV according to its value, a) Per-unit values ​​of power system circuit elements according to the given base power and base voltage values. calculate. b) The perunit you calculate by drawing the equivalent impedance circuit for one phase of the power system given in the figure. show on the values.

A short transmission line connects a step-up transformer on the source side with a series impedance of j0.5 ohms (referred to the primary) to a step-down transformer on the load side with a series impedance of 50 ohms (referred to the primary). The turn ratio of the step-up transformer is 1:10 and a no-load primary voltage of 13.2 (line-to-line) kV. The step-down transformer has a turn ratio of 15:1 and it has a Y-connected, balanced load of 0.667 +j 0.111 ohms connected to its secondary side. A capacitor bank of -j0.239  ohms is added parallel to the load. Assuming an ideal transmission line, the load voltage (line-to-neutral) would be:         A. 5118 V   B. 6.2 kV   C. 8865 V   D. None of the other choices are correct   E. 4225 V

In power distribution systems, what is sometimes necessary to install to reduce harmonic frequencies and distortion between the three-phase transformers and distribution panels?