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(Solved): not by hand writing (2) A three-phase Y transformer is rated 225kV:24kV,400MVA and ...
not by hand writing
(2) A three-phase transformer is rated and has a single-phase equivalent series reactance of as referred to its high-voltage terminals. The transformer is supplying a load of at 0.89 power factor leading at a voltage of (line to line) on its low-voltage side. It is supplied from a feeder whose impedance is connected to its high-voltage terminals. For these conditions, calculate (a) the line-to-line voltage at the high-voltage terminals of the transformer and (b) the line-to-line voltage at the sending end of the feeder.
Expert Answer
We'll use the following steps to determine the line-to-line voltage at the high-voltage terminals of the transformer and the line-to-line voltage at the feeder's sending end: Determine the line current on the transformer's low-voltage side.On the low-voltage side, is shown as the apparent power, and the power factor is 0.89 leading. Using the equation:Apparent Power To solve for current (I), we can rearrange the equations as follows:Current replacing the specified values: On the low-voltage side of the transformer, the line current is roughly Amperes.