An ideal transformer has the next nominal values: 20 kVA, 480/120 v, 60 Hz. The primary...
An ideal transformer has the next nominal values: 20 kVA, 480/120 v, 60 Hz.
The primary winding has a power supply of 240 V connected. The secondary winding powers a 6 A charge with a power factor of 0.85 forward.
Calculate:
a) The voltage on the secondary winding expresed in per unit.
b) The impedance of the charge in per unit.
c) The impedance of the charge refered to the primary, in ohms.
d) Active and reactive power, in W and Var.
Homework Answers
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An ideal transformer has the next nominal values: 20 kVA,
480/120 v, 60 Hz.
The primary...
Ideal, single-phase two-winding transformer A single-phase two-winding transformer is rated 20 kVA, 480/120 V, 60 Hz...
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A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down transformer. The load, which...
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3.4 A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down transformer. The load,...
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A 5 KVA, 480/120V, 60 Hz, non-ideal transformer has the following primary and secondary resistance and reactance values R 80,X1-12Q, R 0.15Q, X 0.20, R 18 KQ, and X 15 KO If the transformer is operating at 90% of its rated load current and the voltage is leading the current by 40 degree: a) Draw the approximate equivalent circuit of the transformer referred to secondary side, b) Calculate the efficiency of the transformer, and c) The voltage regulation
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DOM power face mer has the livers 3.2 kW at rateu Selon Tum D4.10 A 50-KVA, 2400/240-V, 60-Hz distribution transformer lowing resistances and leakage reactances in ohms referred to its ed to its own side. R1 = 3.5 R2 = 0.035 X1 = 5.7 X2 = 0.057 The subscript 1 denotes the primary or high-voltage winding and subscrinen denotes the secondary or low-voltage winding. a. Find the equivalent impedance Zel referred to the primary. b. Find the equivalent impedance Ze2...
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1) A single-phase 50-kVA, 2400/240 volt, 60 Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+2.0) Ω. The equivalent series impedance of the transformer is (10+j25) Ω referred to the high voltage (primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated secondary volitage. Neglect the transformer exciting curent. Using the transtormer raltings as base quantities work this problem in per...
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Problem #4-The primaries of two ideal 240/120 v, 60 Hz single phase transformers are connected in series and the combination is fed from a 480 v supply. The secondary of one transformer is connected to a resistance of 10 ohms and the secondary of the other to a resistance of 20 ohms. a-Calculate the currents in the two resistors. b-How does the 480 v divide between the primaries of the two transformers?
Ideal, single-phase two-winding transformer A single-phase two-winding transformer is rated 20 kVA, 480/120 V, 60 Hz A source connected to the 480-V winding supplies an impedance load con- nected to the 120-V winding. The load absorbs 15 kVA at 0.8 p.f. lagging Ideal, single-phase two-winding transformer A single-phase two-winding transformer is rated 20 kVA, 480/120 V, 60 Hz A source connected to the 480-V winding supplies an impedance load con- nected to the 120-V winding. The load absorbs 15 kVA...
A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformer is used as a step-down transformer. The load, which is connected to the 240-volt secondary winding, absorbs 80 kVA at 0.8 power factor lagging and is at 230 volts. Assuming an ideal transformer, calculate the following: a) primary voltage. b) load impedance. c) load impedance referred to the primary. d) the real and reactive power supplied to the primary winding
4.41 Consider ạ 25 kVA, 240°/240 V, 60 Hz transformer with Z,-2.533 +J2.995 Ω and Z, = (2.5333 + )2.995) 10-2 S2, referred to the primary and secondary sides, respectively. b) The transformer is connected at the receiving end of a feeder that has an impedance of 0.3 +j 1.8 Ω. Let the sending end-voltage magnitude of the feeder be 2400 V. Also there is a load connected to the secondary side of the transformer that draws rated current from...
A 5 KVA, 480/120V, 60 Hz, non-ideal transformer has the following primary and secondary resistance and reactance values R 80,X1-12Q, R 0.15Q, X 0.20, R 18 KQ, and X 15 KO If the transformer is operating at 90% of its rated load current and the voltage is leading the current by 40 degree: a) Draw the approximate equivalent circuit of the transformer referred to secondary side, b) Calculate the efficiency of the transformer, and c) The voltage regulation
DOM power face mer has the livers 3.2 kW at rateu Selon Tum D4.10 A 50-KVA, 2400/240-V, 60-Hz distribution transformer lowing resistances and leakage reactances in ohms referred to its ed to its own side. R1 = 3.5 R2 = 0.035 X1 = 5.7 X2 = 0.057 The subscript 1 denotes the primary or high-voltage winding and subscrinen denotes the secondary or low-voltage winding. a. Find the equivalent impedance Zel referred to the primary. b. Find the equivalent impedance Ze2...
1) A single-phase 50-kVA, 2400/240 volt, 60 Hz distribution transformer is used as a step-down transformer at the load end of a 2400-volt feeder whose series impedance is (1.0+2.0) Ω. The equivalent series impedance of the transformer is (10+j25) Ω referred to the high voltage (primary) side. The transformer is delivering rated load at 0.8 power factor lagging and at rated secondary volitage. Neglect the transformer exciting curent. Using the transtormer raltings as base quantities work this problem in per...
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