![EMM2802 MAYIJUNE 2016 QUESTION B A single phase transformer has a high voltage to low voltage ratio of 10. The following parameters are referred to low voltage side, with a supply of 200V. Equvalent Impedance referred to low woltage side Zev 0.1+jo.s a Load impedance referred to low voltage side R-4000 X-2310 Magnetizing Branch referred to low voltage side Draw an approximate equivalent circut with the given parameters and determine the following: 81 The magnetizing current (), the core loss current (core) and no load 82 The primary current ) 8.3 Voltage on the load, which is on the high voltage side. 8.4 Efficiency of the transformer. current lo on the low voltage s?de 14] QUESTION 9 Draw a neat diagram of connections for carrying open-circut and short arcuit tests on a single phase transformer and show how to determine the following from the tests: 91 the iron loss and copper loss in the transformer at different loads 92 the efficiency at different loads 9 3 the %regulation at different loads at different power factor 9.4 the load in kVA at which the transformer efficiency will be maxumum (2) (151](http://img.homeworklib.com/questions/f0524a90-77e7-11eb-99a7-cfefb421b0c0.png?x-oss-process=image/resize,w_560)
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EMM2802 MAYIJUNE 2016 QUESTION B A single phase transformer has a high voltage to low voltage...
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit...
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent and a per-unit reactance of 5 percent (data taken from the transformer's nameplate). The magnetizing impedance is impedance is j80 per unit. a. Find the equivalent circuit referred to the low-voltage side of this transformer. b. Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. c. Assume that the primary voltage of...
For a 120/208 V, 60 VA single-phase transformer, the approximate equivalent circuit parameters, seen from the...
For a 120/208 V, 60 VA single-phase transformer, the approximate equivalent circuit parameters, seen from the low voltage side, are given as: Re,-0.06 pu. Xeqー0.04 pu, R,-20.45 pm, Xm-35.5 pu Draw the approximate equivalent circuit and show all model components Using the base values of 3-120 V and SB-60 VA, compute: (a) Base current and impedance (b) Real values of the equivalent circuit parameters (c) Per-unit and the real values of the magnetizing current. Compute the voltage regulation and efficiency...
Question-2) A single phase 100 kVA, 100/1000 V transformer has the following results from the open-...
Question-2) A single phase 100 kVA, 100/1000 V transformer has the following results from the open- circuit and short-circuit tests. Open circuit Short Circuit Voltage 100V 50V Current 6A 100A Power 400W 1800W (a) Determine the rated parameters for the high voltage and low voltage sides. (b) Determine the circuit parameters and draw the equivalent circuit referred to the High Voltage side. (©) Determine the voltage regulation for a 0.8 power factor lagging at full load.
Q1 A single-phase 11/2.2 kV, 22 kVA transformer has the following parameters all referred to the HV side RI 0.4, X 0...
Q1 A single-phase 11/2.2 kV, 22 kVA transformer has the following parameters all referred to the HV side RI 0.4, X 0.602, R2 7.5 , X2 22 , Re 2500 , and Xm - 20002 The transformer is supplying 80% of its rated load at a power factor of 0.87 power factor lagging and at its rated voltage. Calculate (a) the efficiency of the transformer, (b) the power losses on the primary side (the copper loss and core loss), and...
Problem # 2-A single phase, 60 Hz, 10 KVA, 440110 V has the following parameters: R1=0.15 R2=0.0086 X1=0.5 X2-0.0286 Re and Xmare 1500 and 1000 referred to the high voltage side. Using the approximat...
Problem # 2-A single phase, 60 Hz, 10 KVA, 440110 V has the following parameters: R1=0.15 R2=0.0086 X1=0.5 X2-0.0286 Re and Xmare 1500 and 1000 referred to the high voltage side. Using the approximate equivalent circuit, Calculate the transformer no load current, power factor and power when terminal voltage is 470 a- V. What would these values be if the transformer were ideal? Calculate the transformer output power and efficiency when load of 1.6+j1.2 ohms is connected b- to its...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
Name: ID# Q.2 A single phase, 100kVA, 1000/100 V transformer is to be tested to determine...
Name: ID# Q.2 A single phase, 100kVA, 1000/100 V transformer is to be tested to determine its excitation branch component and its series impedances. The following test data have been taken from the high-voltage side of the transformer: Open-circuit test (1000V, 0.6A, 400W); Short-circuit test (50V, 100A, 1800W). (25 marks) a) Find the equivalent circuit of the transformer referred to the high-voltage side? b) Find the equivalent circuit of the transformer referred to the low-voltage side? c) The core losses...
Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60...
Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60 Hz. The following results are obtained from open-circuit and short-circuit tests: Test Open-circuit Short-circuit Voltage 7200 V 250 V Current 0.65 A 13.89 A Real Power Input 425 W 1420 W a) Determine the parameters of this transformer, all referred to the primary side. b) The secondary of this transformer is connected to a load that draws 100% of the rated power at rated...
A three-phase Y-A transformer is rated 225-kV:24-kV, 400 MVA and has a single-phase equivalent series reactance...
A three-phase Y-A transformer is rated 225-kV:24-kV, 400 MVA and has a single-phase equivalent series reactance of 6.08 ? as referred to its high-voltage terminals. The transformer is supplying a load of 375 MVA at 0.89 power factor leading at a voltage of 24 kV (line to line) on its low-voltage side. It is supplied from a feeder whose impedance is 0.17 +/2.2 ? connected to its high-voltage terminals. For these conditions, calculate (a) the line-to-line voltage at the high-...
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...
QUESTION 3 A 200 - MVA, 15/200 kV single-phase power transformer has a per – unit resistance of 1.2 percent and a per-unit reactance of 5 percent (data taken from the transformer's nameplate). The magnetizing impedance is impedance is j80 per unit. a. Find the equivalent circuit referred to the low-voltage side of this transformer. b. Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging. c. Assume that the primary voltage of...
For a 120/208 V, 60 VA single-phase transformer, the approximate equivalent circuit parameters, seen from the low voltage side, are given as: Re,-0.06 pu. Xeqー0.04 pu, R,-20.45 pm, Xm-35.5 pu Draw the approximate equivalent circuit and show all model components Using the base values of 3-120 V and SB-60 VA, compute: (a) Base current and impedance (b) Real values of the equivalent circuit parameters (c) Per-unit and the real values of the magnetizing current. Compute the voltage regulation and efficiency...
Question-2) A single phase 100 kVA, 100/1000 V transformer has the following results from the open- circuit and short-circuit tests. Open circuit Short Circuit Voltage 100V 50V Current 6A 100A Power 400W 1800W (a) Determine the rated parameters for the high voltage and low voltage sides. (b) Determine the circuit parameters and draw the equivalent circuit referred to the High Voltage side. (©) Determine the voltage regulation for a 0.8 power factor lagging at full load.
Q1 A single-phase 11/2.2 kV, 22 kVA transformer has the following parameters all referred to the HV side RI 0.4, X 0.602, R2 7.5 , X2 22 , Re 2500 , and Xm - 20002 The transformer is supplying 80% of its rated load at a power factor of 0.87 power factor lagging and at its rated voltage. Calculate (a) the efficiency of the transformer, (b) the power losses on the primary side (the copper loss and core loss), and...
Problem # 2-A single phase, 60 Hz, 10 KVA, 440110 V has the following parameters: R1=0.15 R2=0.0086 X1=0.5 X2-0.0286 Re and Xmare 1500 and 1000 referred to the high voltage side. Using the approximate equivalent circuit, Calculate the transformer no load current, power factor and power when terminal voltage is 470 a- V. What would these values be if the transformer were ideal? Calculate the transformer output power and efficiency when load of 1.6+j1.2 ohms is connected b- to its...
3.10 A 240/120 V, 4.8 kVA, 60 Hz, single-phase transformer is used to supply a 4.8 kVA resistive load (i.e., the load has a power factor of 1.0) at rated voltage of 120 V a) If you assume the transformer is ideal, what would be the magni- tude of the expected primary side (240 V side) current? b) Again, if you assume the transformer is ideal, what is the apparent impedance of the load viewed from the high-voltage side of...
Name: ID# Q.2 A single phase, 100kVA, 1000/100 V transformer is to be tested to determine its excitation branch component and its series impedances. The following test data have been taken from the high-voltage side of the transformer: Open-circuit test (1000V, 0.6A, 400W); Short-circuit test (50V, 100A, 1800W). (25 marks) a) Find the equivalent circuit of the transformer referred to the high-voltage side? b) Find the equivalent circuit of the transformer referred to the low-voltage side? c) The core losses...
Question 2 A single-phase transformer has the following nameplate ratings: 100 kVA, 7200/240 V and 60 Hz. The following results are obtained from open-circuit and short-circuit tests: Test Open-circuit Short-circuit Voltage 7200 V 250 V Current 0.65 A 13.89 A Real Power Input 425 W 1420 W a) Determine the parameters of this transformer, all referred to the primary side. b) The secondary of this transformer is connected to a load that draws 100% of the rated power at rated...
A three-phase Y-A transformer is rated 225-kV:24-kV, 400 MVA and has a single-phase equivalent series reactance of 6.08 ? as referred to its high-voltage terminals. The transformer is supplying a load of 375 MVA at 0.89 power factor leading at a voltage of 24 kV (line to line) on its low-voltage side. It is supplied from a feeder whose impedance is 0.17 +/2.2 ? connected to its high-voltage terminals. For these conditions, calculate (a) the line-to-line voltage at the high-...
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...
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