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- A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.(a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a series impedance Z2 across winding 2. If one wants to replace Z2, with a series impedance Z1 across winding 1 and keep the terminal behavior of the two circuits to be identical, find Z1 in terms of Z2. (b) Would the above result be true if instead of a series impedance there is a shunt impedance? (c) Can one refer a ladder network on the secondary (2) side to the primary (1) side simply by multiplying every impedance byat2 ?The ratings of a three-phase three-winding transformer are Primary(1): Y connected 66kV,15MVA Secondary (2): Y connected, 13.2kV,10MVA Tertiary (3): A connected, 2.3kV,5MVA Neglecting winding resistances and exciting current, the per-unit leakage reactances are X12=0.08 on a 15-MVA,66-kV base X13=0.10 on a 15-MVA,66-kV base X23=0.09 on a 10-MVA,13.2-kV base (a) Determine the per-unit reactances X1,X2,X3 of the equivalent circuit on a 15-MVA,66-kV base at the primary terminals. (b) Purely resistive loads of 7.5 MW at 13.2 kV and 5 MW at 2.3kV are connected to the secondary and tertiary sides of the transformer, respectively. Draw the per- unit impedance diagram, showing the per-unit impedances on a 15-MVA,66-kV base at the primary terminals.
- In no load phasor diagram of practical transformer, the magnetizing current Imag is with primary voltage Vp. O Leading by 30° O 90° out of phase O In phase O Lagging by 60°In no load phasor diagram of practical transformer, the magnetizing current Imag is with flux Ø O Leading by 30° O Lagging by 60° In phase O 90° out of phaseA 50 Hz, Scott connected transformer supplies an unbalanced two phase load at ( 400 V) per phase. For the leading phase the load has a resistance of (13.3 ohm) and capacitor of (318) micro farad in series. For the other phase the load consists of resistance (10) ohm and an inductance of (42.3) mH. Calculate both mathematically and graphically the lines currents on 3- phase side. The main transformer primary to secondary turns ratio is (12/1).
- A 50 kVA transformar has a core loss of 500 W and full load core loss of 900 W. The load at which the efficiency is maximum is ?In no load Phasor diagram of practical transformer, the core loss current Ic is with primary voltage Vp. In phase O 90 degrees Leading 90 degrees Lagging O All the aboveA three phase power transformer having a line voltage ratio of 400 V to 33 kV is connected in star-delta. The C.T.s on 400 V side have current ratio as 1000/5. What must be the C.T. ratio on 33 kV side. Assume current on 400 V side of transformer to be 1000 A. C.T. secondaries in delta p 5A oooo oooo 5√3 A -0000 0000 0000 0000 Star-delta transformer 0000 5√3 A vooo னள். m reeee p C.T. secondaries in star 5√3 A 0000
- The rated voltages of a single-phase transformer are 2000 V and 200 V in its primary and secondary respectively. The shunt impedance can be modelled with a resistance of 14000 ohms in parallel with a reactance of 1100 ohm, both refer to primary side. The primary and secondary series impedances are (0.12+j 0.35) ohms and (0.0012+j 0.0035) ohms respectively. A load is connected to the secondary side of transformer, draws 810 KVA with a lagging power factor of 0.85. The load voltage is same as rated voltage, that is 200 V. ▪ Use per unit method for analysis and find the voltage on primary side in pu.EXe A loo kvA transformer has y00turps on the Primary and &s tenng on the secondry. Th poimacy and and secondary Vesistemce are and aolsz Vespectively, aned the Corespondng reactances are lilse aN oo3 vespectively, The supply Vo Hage i 2200 V. calculate Ho Voltege regulation and secorndhry terminal voltage for full lond having on Pif of. D ong laggingGiven Zo-j407 2, R₁143, R6317 52 and a 0.04, what is the magnitude of the source voltage Vs (in V rms) in the primary of the ideal transformer? Vs R₁ ww Answer: Zc Zc R₁ Use up to 2 digits after the decimal point if necessary in your answer below VL-28020 V TR