You have a 5MVA three-phase 4160/480V transformer that has an impedance of 4.63%. a. Calculate input current at full load b. Calculate output current and output voltage at full load c. Calculate the line - to - line short circuit current the transformer can supply.
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- Find full load current..Determine the regulation of a transformer in which thepercentage resistance drop is 1% and the percentagereactance drop is 5% when the power factor 0.8 leading.Single phase half wave AC-AC converter has a resistance of R = 50 ohms. Input voltage is given as 230 Vrms. Transformer conversion ratio is 1:1. If T1 thyristor is triggered at 60 degrees; a)Rms output voltage? b)Output power? c)RMS load current and average load current? d)Input power factor? e)Average and RMS thyristor current?
- 11)This MCQ QUESTION FROM BASIC POWER ELECTRICAL ENGINEERING course.Q2/ Fill in the blanks: 1- The two windings of a transformer is linked. ***** 2- If a transformer primary is energized from a square wave voltage source, its output voltage will be.......... 3- The primary winding of a 220/6 V, 50 Hz transformer is energized from 110 V, 60 Hz supply. The secondary output voltage will be ...... V.5) A flyback converter has an input of 45 V, an output of 15 V, a duty ratio of 0.4, and a switching frequency of 80 kHz. The load resistor is 15 Q. (a) Determine the transformer turns ratio. (b) Determine transformer magnetizing inductance Lm such that its maximum current is 120% of its average current.
- A 250/125 V, five kVA single-phase transformer has a primary resistance of 0.2 ohms and reactance of 0.75 ohms. The secondary resistance is 0.05 ohm and reactance of 0.2 ohms.a) Determine its regulation while supplying full load on 0.8 leading p.f.b) The secondary terminal voltage on full load and 0.8 leading p.f.Ans.: -0.4.88%; 131.1(a)Design a forward converter to produce an output voltage of 30V when the input dc voltage is unregulated and varies from 150V to 175V. The output power varies from 20W to 50W. The duty ratio of the switch is varied to compensate for the fluctuations in the input dc source to regulate the output voltage at 30V. Specify: the switching frequency and range of required duty ratio of the switch, ii. the turns ratios of the transformer, i. the value of L, and iv. the capacitance required to limit the output ripple to less than 0.2%. Your design MUST work for all operating conditions.i. Draw the block diagram of CRO with indication of each part ii. What are the advantages of Auto-transformer iii. What are the advantages and disadvantages of themistors?
- FN.Q5 – A Transformer has primary windings as Np = 720 and secondary windings as Ns = 144. Its secondary voltage is Vs = 42V and output power of the transformer is PN= 2750W. The value of loses powers are Pcu = 52,5W and Pre = 39W. The resistance of loads are RLI = 1,660 and R12 = 1,950. (Pcu and PFE will be considered to be approximately the same in different load values.) Determine the following values in the circuit: Primary winding Secondary winding N, turns Ng turns Magnetic Flux, Primary current ISL Secondary 4 current Primary voltage ISL1 (ISL2 Secondary voltage RL1 R12 Transformer Core (a) the primary voltage VP, (b) the secondary load current Isı, if the transformer is rated at RLI and R12, (c) the primary load current IpL, (d) the load resistance R13 when the transformer is fully loaded by third in parallel, (e) efficiency n (fully loaded)3. A 3200/400 single-phase transformer has winding resistance and reactance of 30 and 132 respectively in the primary and 0.0292 and 0.0652 in the secondary. Express these in terms of (a) primary alone, (b) secondary alone. (ans. (a) 4.282, 17.16; (b) 0.067, 0.268)A 50 Hz 1-phase transformer has a turn-ratio of 6. The resistances are 0.90 ohm and 0.03 ohm and the reactance’s 5 ohm and 0.13 Q for high voltage and low voltage respectively. Determine (a) the voltage to be applied to the high voltage side to obtain full load current of 200 A in the low voltage winding on short circuit (b) the p.f. on short circuit.