Question

5 Three Type B step-voltage regulators are connected in wye and located 7. on the secondary bus of a 12.47kV substation. The feeder is serving an unbalanced load. A power-flow study has been run and the voltages at the substation and the load center node are 7200/0 Vsubabc 7200/-120 V 7200/120 6890.6/-1.49 6990.5/117.05 VLCabel 6825.9/-122.90 v The currents at the substation are 362.8/-27.3 ]-395.4/-154.7 A abc 329.0/98.9 The regulator potential transformer ratio is 7200-120 and the current transformer ratio is 500:5. The voltage level of the regulators is setat 121 V and the bandwidth at 2 V. a. Determine the equivalent line impedance per phase between the reg ulator and the load center. b. The compensators on each regulator are to be set with the same X values. Specify these values in volts and in Ohms. R and

Answer 1

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