Query 1 A three-phase transformer has a rated capacity of 25 kVA. Its turn ratio yields 480 V / 120 V A transformer with

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Query 1 A Three Phase Transformer Has A Rated Capacity Of 25 Kva Its Turn Ratio Yields 480 V 120 V A Transformer With 1 (46.14 KiB) Viewed 45 times

Query 1 A three-phase transformer has a rated capacity of 25 kVA. Its turn ratio yields 480 V / 120 V A transformer with rating of 25 kVA operates with a ratio of 400 V/120V and 50 Hz. The machine was tested to identify its parameters: • In the short-circuit test, an active power of 220 W was measured while applying 60 V in the primary winding. • In the open-circuit test, primary winding current of 7 A and power of 100 W were measured. Calculate the following features: Winding equivalent resistance (5 points) Winding equivalent leakage reactance (5 points) Core resistance (5 points) Magnetization reactance (5 points) Determine the parameters of the previous step in p.u. (5 points each, 20 points total). Query 2 Consider the following tangential magnetic flux density signals for an inner rotor (first figure) and outer rotor (second figure) hysteresis machines. . . 0.5 Tangential flux density [T] W N 0 -0.5 -1 0 50 300 350 100 150 200 250 Mechanical angle [deg]