61. A 20KVA single phase 960-120V transformer with Z% = 4.8%. Find the maximum short circuit current for the secondary.
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Q: The appropriate DB for 1000KVA transformer is?
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- An infinite bus, which is a constant voltage source, is connected to the primary of the three-winding transformer of Problem 3.53. A 7.5-MVA,13.2-kV synchronous motor with a sub transient reactance of 0.2 per unit is connected to the transformer secondary. A5-MW,2.3-kV three-phase resistive load is connected to the tertiary Choosing a base of 66 kV and 15 MVA in the primary, draw the impedance diagram of the system showing per-unit impedances. Neglect transformer exciting current, phase shifts, and all resistances except the resistive load.(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 ?For an ideal 2-winding transformer, an impedance Z2 connected across winding 2 (secondary) is referred to winding 1 (primary) by multiplying Z2 by (a) The turns ratio (N1/N2) (b) The square of the turns ratio (N1/N2)2 (c) The cubed turns ratio (N1/N2)3
- The motors M1andM2 of Problem 3.45 have inputs of 120 and 60 MW, respectively, at 13.2 kV, and both operate at unity power factor. Determine the generator terminal voltage and voltage regulation of the line. Neglect transformer phase shifts.In order to avoid difficulties with third-harmonic exciting current, which three-phase transformer connection is seldom used for step-up transformers between a generator and a transmission line in power systems. (a) Y- (b) -Y (c) Y-YA single-phase, 50kVA, 2400:240V distribution transformer has an impedance of 0.72+j0.92Ω from the high voltage winding and 0.007+j0.009Ω from the low voltage winding. This transformer is supplied by a feeder whose impedance is 0.3+j1.6Ω. Determine the voltage at the emitter terminal of the feeder when the load connected to the transformer secondary draws rated current at 240V with 0.8 lagging power factor. For this case, it is convenient to use the approximate circuit of the transformer given below. PLEASE, TYPE, HAND WRITING GETS UNDERSTANDING,
- A 70 KVA,3-ph,delta/star,50Hz transformer, has number of turns of primary andsecondary 660 and 80 turns respectively. The transformer draws 12 A from the main source, and secondary has a balanced Load at 0.95 Lagging p.f.. Determine the secondary phasevoltage, line current and output.For the 11000/400V, Δ/Y 3-ph transformer, if the line current in the secondary is 500A calculate the line and phase current in the primary.A single-phase step-down transformer is rated at 15 kVA, 440V/120 V. Compute the rated current of the secondary winding in Amps.
- Find the value of line current and phase current of primary and secondary of a 100 kVA 2200/440 V, 3 phase delta-star transformer.The appropriate DB for 1000KVA transformer is?Draw the complete phasor diagram of a practical single-phase transformer supplying RL load. Assume transformation ratio of unity.
