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Q1: A 20-kVA 8000/480-V distribution transformer has the following resistances and reactances: Rp...
6. A 20 kVA. 60 Hz, 8000/277 V transformer has the following impedances referred to the high volt...
6. A 20 kVA. 60 Hz, 8000/277 V transformer has the following impedances referred to the high voltage side: Req-320, xe,-45Ω,R.-250kQ,Xm-30kQ. A) Calculate the voltage across rated load impedance with PF= 0.707 lagging when the transformer is connected to rated input voltage. B) Draw the phasor diagram showing the load voltage and current, voltage drop across the series impedance and voltage at the low voltage side of the ideal transformer, C) Calculate the efficiency of the transformer D) What adjustments...
2.14 The resistances and leakage reactances of a 40-kVA 60-Hz 7.97-kV-V:240-V single-phase distribution transformer are where...
2.14 The resistances and leakage reactances of a 40-kVA 60-Hz 7.97-kV-V:240-V single-phase distribution transformer are where subscript 1 denotes the 7.97-kV winding and subscript 2 denotes the 240-V winding. Each quantity is referred to its own side of the transformer. Consider a rated-kVA load connected at the low-voltage terminals. Assuming the load voltage to remain constant at 240 V use MATLAB to plot the high-side terminal voltage as a function of the power-factor angle as the load power factor varies...
4. [Transformer - 15 points) A 50-kVA, 13,800/208-V, A-Y distribution transformer has an equivalent resistance of...
4. [Transformer - 15 points) A 50-kVA, 13,800/208-V, A-Y distribution transformer has an equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation at full load and 0.9 PF leading.
A 50-kVA, 13,800/208-V, Delta to Wye connected distribution transformer has an equivalent resistance of 3 percent...
A 50-kVA, 13,800/208-V, Delta to Wye connected
distribution transformer has an equivalent resistance of 3 percent
and a reactance of 9 percent per unit.
(a) what's the transformers phase impedance referred to the high
side voltage?
(b) what's the transformers voltage regulation at full load and 0.9
PF leading?
equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation...
A 200 kVA, 7200/600 V, 60 Hz transformer is operating at rated load and 0.9 p.f....
A 200 kVA, 7200/600 V, 60 Hz transformer is operating at rated
load and 0.9 p.f. lagging. The core loss, winding resistances and
leakage reactances, expressed in per unit are 0.0056, 0.0133 and
0.0557 respectively. Determine: a) The efficiency. b) The voltage
regulation. c) The efficiency and regulation at 0.3 load and 0.8
p.f. lagging.
A 200 kVA, 7200/600 V, 60 Hz transformer is operating at rated load and 0.9 p.f. lagging. The core loss, winding resistances and leakage reactances,...
Problem (1): A 15-KVA, 2400:240-V, 60 Hz transformer has the following equivalent circuit parameters: R =...
Problem (1): A 15-KVA, 2400:240-V, 60 Hz transformer has the following equivalent circuit parameters: R = 2.522 R2 = 0.02522 Xi = 722 X = 0.0712 Re = 32 kl Xm = 11.5 k12 If the transformer is supplying a 10-kW, 0.8 PF lagging load at rated voltage, assuming the output voltage is the reference, draw the transformer's exact equivalent circuit referred to the primary (H.V) side and use it to calculate: 1. The input current 2. The input voltage...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting thre...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting three single phase transformers in the Dynll vector group as shown in Fig.P1. The per phase equivalent circuit parameters on the high voltage side are: R1-0.72 Ω, Xi,-0.92 Ω, R2-0.70 Ω, Xp-0.90 Ω, R.-308.49 Ω, and X,,-44.61 Ω (a) Sketch the corresponding phasor diagram of the primary and secondary voltages for the Dynll vector group; lagging; terminal voltage is 415 V line to line, and...
The short-circuit test readings for a 50-kVA 2400:240-V transformer are 48 V, 20.8 A, and 617...
The short-circuit test readings for a 50-kVA 2400:240-V transformer are 48 V, 20.8 A, and 617 W, with the instruments located on the high-voltage side and the low-voltage side short- circuited. An open-circuit test with the low-voltage side energized gives instrument readings on that side of 240 V, 5.41 A, and 186 W. 1. Calculate the equivalent parameters of the transformer as referred to the high-voltage side. 2. Draw the equivalent approximate circuit of that transformer referred to the high...
lI. A single-phase 100 KVA, 2000/200 V transformer has the following test results Open-circuit (OC) test (LV side): 200 V, 8,0 A, 600 W Short-Circuit (SC) test (HV side): 100 V,50 A, 2000 W a. De...
lI. A single-phase 100 KVA, 2000/200 V transformer has the following test results Open-circuit (OC) test (LV side): 200 V, 8,0 A, 600 W Short-Circuit (SC) test (HV side): 100 V,50 A, 2000 W a. Determine the approximate equivalent circuit referred to the HV side. b. Find the voltage regulation at full-rated current delivering rated voltage and PF of 0.8 lagging. c. Calculate efficiency of transformer d. Assume that, voltage at HV side is 2000 V. Calculate the voltage at...
4.41 Consider ạ 25 kVA, 240°/240 V, 60 Hz transformer with Z,-2.533 +J2.995 Ω and Z, = (2.5333 + ...
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...
6. A 20 kVA. 60 Hz, 8000/277 V transformer has the following impedances referred to the high voltage side: Req-320, xe,-45Ω,R.-250kQ,Xm-30kQ. A) Calculate the voltage across rated load impedance with PF= 0.707 lagging when the transformer is connected to rated input voltage. B) Draw the phasor diagram showing the load voltage and current, voltage drop across the series impedance and voltage at the low voltage side of the ideal transformer, C) Calculate the efficiency of the transformer D) What adjustments...
2.14 The resistances and leakage reactances of a 40-kVA 60-Hz 7.97-kV-V:240-V single-phase distribution transformer are where subscript 1 denotes the 7.97-kV winding and subscript 2 denotes the 240-V winding. Each quantity is referred to its own side of the transformer. Consider a rated-kVA load connected at the low-voltage terminals. Assuming the load voltage to remain constant at 240 V use MATLAB to plot the high-side terminal voltage as a function of the power-factor angle as the load power factor varies...
4. [Transformer - 15 points) A 50-kVA, 13,800/208-V, A-Y distribution transformer has an equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation at full load and 0.9 PF leading.
A 50-kVA, 13,800/208-V, Delta to Wye connected
distribution transformer has an equivalent resistance of 3 percent
and a reactance of 9 percent per unit.
(a) what's the transformers phase impedance referred to the high
side voltage?
(b) what's the transformers voltage regulation at full load and 0.9
PF leading?
equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation...
A 200 kVA, 7200/600 V, 60 Hz transformer is operating at rated
load and 0.9 p.f. lagging. The core loss, winding resistances and
leakage reactances, expressed in per unit are 0.0056, 0.0133 and
0.0557 respectively. Determine: a) The efficiency. b) The voltage
regulation. c) The efficiency and regulation at 0.3 load and 0.8
p.f. lagging.
A 200 kVA, 7200/600 V, 60 Hz transformer is operating at rated load and 0.9 p.f. lagging. The core loss, winding resistances and leakage reactances,...
Problem (1): A 15-KVA, 2400:240-V, 60 Hz transformer has the following equivalent circuit parameters: R = 2.522 R2 = 0.02522 Xi = 722 X = 0.0712 Re = 32 kl Xm = 11.5 k12 If the transformer is supplying a 10-kW, 0.8 PF lagging load at rated voltage, assuming the output voltage is the reference, draw the transformer's exact equivalent circuit referred to the primary (H.V) side and use it to calculate: 1. The input current 2. The input voltage...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting three single phase transformers in the Dynll vector group as shown in Fig.P1. The per phase equivalent circuit parameters on the high voltage side are: R1-0.72 Ω, Xi,-0.92 Ω, R2-0.70 Ω, Xp-0.90 Ω, R.-308.49 Ω, and X,,-44.61 Ω (a) Sketch the corresponding phasor diagram of the primary and secondary voltages for the Dynll vector group; lagging; terminal voltage is 415 V line to line, and...
The short-circuit test readings for a 50-kVA 2400:240-V transformer are 48 V, 20.8 A, and 617 W, with the instruments located on the high-voltage side and the low-voltage side short- circuited. An open-circuit test with the low-voltage side energized gives instrument readings on that side of 240 V, 5.41 A, and 186 W. 1. Calculate the equivalent parameters of the transformer as referred to the high-voltage side. 2. Draw the equivalent approximate circuit of that transformer referred to the high...
lI. A single-phase 100 KVA, 2000/200 V transformer has the following test results Open-circuit (OC) test (LV side): 200 V, 8,0 A, 600 W Short-Circuit (SC) test (HV side): 100 V,50 A, 2000 W a. Determine the approximate equivalent circuit referred to the HV side. b. Find the voltage regulation at full-rated current delivering rated voltage and PF of 0.8 lagging. c. Calculate efficiency of transformer d. Assume that, voltage at HV side is 2000 V. Calculate the voltage at...
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...
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