The following data was obtained when open circuit and short circuit tests were performed on a...
The following data was obtained when open circuit and short
circuit tests were performed on a single phase, 50 KVA, 2,400:240
V, 60 Hz distribution transformer:
With high voltage winding open circuited: Voc = 240 V, Ioc = 4.85
A, Poc = 173 W
With low voltage winding short circuited: Vsc = 52 V, Isc = 20.8 A,
Psc = 650 W
a) Determine the equivalent circuit of the transformer referred to
its high voltage side and to its low voltage side.
b) Draw the phasor diagram corresponding to the circuit referred to
the high voltage side.
c) Compute the efficiency of the transformer corresponding to a
full load, 0.8 power factor lagging and one half load, 0.6 power
factor lagging.
d) Determine the fraction of full load at which the maximum
efficiency of the transformer occurs, and compute the efficiency at
that load.
Homework Answers
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The following data was obtained when open circuit and short
circuit tests were performed on a...
I have these data from Open circuit and Short circuit tests: OCT: Voc= 105.9 v Ioc=...
I have these data from Open circuit and Short circuit tests:
OCT:
Voc= 105.9 v
Ioc= 0.08 A
Poc= 2 W
SCT:
Vsc= 12.9 V
Isc= 0.45 A
Psc= 3 W
pf= 0.669
How to correclty calculate the following
parameters:
The transformer rating
is
a. winding polarities b. core resistance and magnetization losses c. flux linkage losses d. winding resistances e. efficiency f. voltage regulation
Electric Machinery Problem 2: [50 points] A 15-KVA, 230/2300-V transformer is considered. The following test data...
Electric Machinery
Problem 2: [50 points] A 15-KVA, 230/2300-V transformer is considered. The following test data have been taken: | OC Test (on Primary) Voc = 230 V loc = 2.8 A Poc = 100 W SC Test (on Secondary) Vsc = 47 V Isc = 9.5 A Psc = 350 W (a) Find the equivalent circuit of this transformer referred to the high- voltage side. [10 points] (b) Find the equivalent circuit of this transformer referred to the low-...
Q8. The following data are obtained when open circuit and short circuit tests are performed on...
Q8. The following data are obtained when open circuit and short circuit tests are performed on a single phase, 50 kVA, 2400/240 Volt 50 HZ distribution transformer. VOLTAGE(volts)CURRENT (amperes) POWER (watts) 213 Measurement in low voltage side with high voltage winding open Measurement on high voltage side with low voltage winding shorted 240 5.97 60 20.8 750 (a) Neglecting the series impedance, determine the exciting admittance referred to the high voltage side. (b) Neglecting the exciting admittance, determine the equivalent...
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...
please solve it clearly A 1000-VA, 230/115-V has the following equivalent circuit parameters Referred to high...
please solve it clearly
A 1000-VA, 230/115-V has the following equivalent circuit parameters Referred to high voltage side Referred to low voltage side Req=0.503 Ohm Rc=3383 Ohm Xeq=1.905 Ohm XM=1099 Ohm (Find the expected values for the open and short circuit tests and fill the following table (show all steps Short Circuit test (High voltage side) =VSC - Isc-rated current Pse Open Circuit test (Low voltage side) -Voc -Ioc Poc Then .a) Find the equivalent circuit of this transformer referred...
Question 31 (17 points) 120/120 single-phase transformer. Calculate the values for the equivalent circuit for the single-phase transformer for the given short and open circuit test shown below. (2 po...
Question 31 (17 points) 120/120 single-phase transformer. Calculate the values for the equivalent circuit for the single-phase transformer for the given short and open circuit test shown below. (2 points) Draw the equivalent circuit. (1 point each) Find Ssc, QSC, Soc, Qoc, R1, R2, XI, X2, Rc, Xm, PFsc, PFoc, (esc θ。c) phase angel between V and I. What is the power rating of this transformer? Short circuit test (performed at High Voltage side) Vsc 16.20V rms, Isc 5.00 A...
step by step please The following data were obtained for a 20-kVA, 60-Hz, 2400:240-V distribution transformer...
step by step please
The following data were obtained for a 20-kVA, 60-Hz, 2400:240-V distribution transformer tested 5. at 60 Hz Power Voltage V Current, A 240 61.3 1038 8.33 With high-voltage winding open-circuited With low-voltage terminals short-circuited 122 257 Compute the efficiency at full-load current and the rated terminal voltage at 0.8 power factor. a. Assume that the load power factor is varied while the load current and secondary terminal voltage are b. held constant. Use a phasor diagram...
A 2.2KVA 600/120 V, transformer has the following data for its OC test and SC test:...
A 2.2KVA 600/120 V, transformer has the following data for its OC test and SC test: OC Test: Voc: 120V Ioc: 0.6A Poc: 16W SC Test Vsc = 12V Isc = 3.67A Psc= 30W (a) Find the equivalent circuit referred to its HV and LV side. (b) If it operating as a step-down transformer, and delivering its rated current at the rated voltage and 0.85 pf lagging, find what will be the input voltage. (c) Find the Voltage regulation of...
Choose the base power as 50-KVA, the primary base voltage as 2400-V, the secondary voltage as...
Choose the base power as 50-KVA, the primary base voltage as 2400-V, the secondary voltage as 240-V: (a) Calculate and sketch the transformer equivalent circuit in per unit values' (b) The transformer is carrying rate load of 1.0 pu at.8 power factor lagging. Calculate the primary voltage in per unit. (c) Calculate the efficiency of the transformer at this load. A 50-KVA 2400/240-V, 60-Hz distribution transformer is tested with the following results: Open circuit Test Short Circuit Test Voc =...
Electric Machines Problem 1 (40 points) The following data were obtained for a 20 kVA,60 H...
Electric Machines
Problem 1 (40 points) The following data were obtained for a 20 kVA,60 H z, 2400/240 V distribution transformer tested at 60 Hz: HV open circuited: Voc 240 V, loc 1.038 A, Poc 122 W LV short circuited: Vc 61.3 V,Is8.33 A, Pc 257 W 1) Find the parameters of the transformer and equivalent circuit referred to LV side 2) Find voltage regulation when the transformer oper ates as step down and delivers its rated kVA at rated...
I have these data from Open circuit and Short circuit tests:
OCT:
Voc= 105.9 v
Ioc= 0.08 A
Poc= 2 W
SCT:
Vsc= 12.9 V
Isc= 0.45 A
Psc= 3 W
pf= 0.669
How to correclty calculate the following
parameters:
The transformer rating
is
a. winding polarities b. core resistance and magnetization losses c. flux linkage losses d. winding resistances e. efficiency f. voltage regulation
Electric Machinery
Problem 2: [50 points] A 15-KVA, 230/2300-V transformer is considered. The following test data have been taken: | OC Test (on Primary) Voc = 230 V loc = 2.8 A Poc = 100 W SC Test (on Secondary) Vsc = 47 V Isc = 9.5 A Psc = 350 W (a) Find the equivalent circuit of this transformer referred to the high- voltage side. [10 points] (b) Find the equivalent circuit of this transformer referred to the low-...
Q8. The following data are obtained when open circuit and short circuit tests are performed on a single phase, 50 kVA, 2400/240 Volt 50 HZ distribution transformer. VOLTAGE(volts)CURRENT (amperes) POWER (watts) 213 Measurement in low voltage side with high voltage winding open Measurement on high voltage side with low voltage winding shorted 240 5.97 60 20.8 750 (a) Neglecting the series impedance, determine the exciting admittance referred to the high voltage side. (b) Neglecting the exciting admittance, determine the equivalent...
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...
please solve it clearly
A 1000-VA, 230/115-V has the following equivalent circuit parameters Referred to high voltage side Referred to low voltage side Req=0.503 Ohm Rc=3383 Ohm Xeq=1.905 Ohm XM=1099 Ohm (Find the expected values for the open and short circuit tests and fill the following table (show all steps Short Circuit test (High voltage side) =VSC - Isc-rated current Pse Open Circuit test (Low voltage side) -Voc -Ioc Poc Then .a) Find the equivalent circuit of this transformer referred...
Question 31 (17 points) 120/120 single-phase transformer. Calculate the values for the equivalent circuit for the single-phase transformer for the given short and open circuit test shown below. (2 points) Draw the equivalent circuit. (1 point each) Find Ssc, QSC, Soc, Qoc, R1, R2, XI, X2, Rc, Xm, PFsc, PFoc, (esc θ。c) phase angel between V and I. What is the power rating of this transformer? Short circuit test (performed at High Voltage side) Vsc 16.20V rms, Isc 5.00 A...
step by step please
The following data were obtained for a 20-kVA, 60-Hz, 2400:240-V distribution transformer tested 5. at 60 Hz Power Voltage V Current, A 240 61.3 1038 8.33 With high-voltage winding open-circuited With low-voltage terminals short-circuited 122 257 Compute the efficiency at full-load current and the rated terminal voltage at 0.8 power factor. a. Assume that the load power factor is varied while the load current and secondary terminal voltage are b. held constant. Use a phasor diagram...
Choose the base power as 50-KVA, the primary base voltage as 2400-V, the secondary voltage as 240-V: (a) Calculate and sketch the transformer equivalent circuit in per unit values' (b) The transformer is carrying rate load of 1.0 pu at.8 power factor lagging. Calculate the primary voltage in per unit. (c) Calculate the efficiency of the transformer at this load. A 50-KVA 2400/240-V, 60-Hz distribution transformer is tested with the following results: Open circuit Test Short Circuit Test Voc =...
Electric Machines
Problem 1 (40 points) The following data were obtained for a 20 kVA,60 H z, 2400/240 V distribution transformer tested at 60 Hz: HV open circuited: Voc 240 V, loc 1.038 A, Poc 122 W LV short circuited: Vc 61.3 V,Is8.33 A, Pc 257 W 1) Find the parameters of the transformer and equivalent circuit referred to LV side 2) Find voltage regulation when the transformer oper ates as step down and delivers its rated kVA at rated...
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