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2 points Save Answe A 100KVA Transformer supplies a load of O.Spf. The Transformer iron Losses...
Problem 2: A 10 KVA 2200/220 V, 50 Hz transformer core and full load copper losses...
Problem 2: A 10 KVA 2200/220 V, 50 Hz transformer core and full load copper losses are given as PCore = 153 W, PCu = 224 W. a) Find the maximum efficiency b) Determine the all-day efficiency under following load pattern: 1. 2 hrs at 5/4 load 2. 6 hrs at full load 3. 8 hrs at 2 load 4. 4 hrs at 4 load 5. 4 hrs at no load
Q2.) A 60KVA, Single phase 3300/400 V transformer gave the following test results. Table 2.1 Open...
Q2.) A 60KVA, Single phase 3300/400 V transformer gave the following test results. Table 2.1 Open circut test 3300V applied to primary, power taken 430W Short circuit test Primary Input power is 525 watts Calculate the efficiency at a) full load at 0.7 power factor b) Half load at 0.7 power factor ) An ideal transformer connected to a 240V mains, supplies a 12V, 150W lamp. Calculate a) Transformer turns ratio b) The current taken from the supply. [2] [2]...
Q-1 A 60Hz, 480V/240V,960V A transformer is supplying a 960W passive load at 240V. The resistances...
Q-1 A 60Hz, 480V/240V,960V A transformer is supplying a 960W passive load at 240V. The resistances of the primary side and secondary side of the transformer are 1.092 and 0.252 respectively. If the no load losses of the transfomer is given by P-Vã 4800 W where Vn is the input voltage of the transformer in Volt. Answer the following: a) Calculate transformer efficiency b) Do you allow this transformer to be connected to 240V 50Hz distribution system? Explain. c What...
7. A transformer is rated at 75kVA, with a primary voltage of 32kV. When tested under...
7. A transformer is rated at 75kVA, with a primary voltage of 32kV. When tested under "Full Load" condition, its copper loss is 870W and core loss is 320W. If an industrial load rated at 1500V with a pf = 0.76 is connected to the secondary, determine: a) The transformation ratio. b) Total power loss at "one-third load". c) Efficiency of the transformer at "one-third load". d) Primary and secondary currents at "one-third 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...
Q2: A single-phase 10 KVA, 2400/240 V, 50 Hz transformer used in distribution network has the...
Q2: A single-phase 10 KVA, 2400/240 V, 50 Hz transformer used in distribution network has the following wattmeter reading: (10 X 3 = 30 Marks) Open-circuit Test wattmeter reading: 100 W (at rated voltage) Short-circuit Test wattmeter reading: 60 W (test conducted at 50% load condition) (a) Calculate the efficiency of the transformer when it delivers full load at 0.8 pflagging. (b) Calculate the output when transformer operating at maximum efficiency and also calculate the maximum efficiency. (c) Load on...
For full load operation of 60Hz, 380V, 4 pole 30kW induction motor, the speed is 1746rpm,...
For full load operation of 60Hz, 380V, 4 pole 30kW induction motor, the speed is 1746rpm, input current 56.2A power factor 90%. In no load operation, input current 17.3A, power factor 13.5%. In full load operation, assume that the mechanical loss is 25% of the total loss and no other losses. a) Iron loss load efficiency b) Find a rotor copper loss under full load c) Iron loss d) Find a fixed automatic hand under full load e) Find the...
1. A transformer manufacturing firm wanted to include the following data in the product brochure. a....
1. A transformer manufacturing firm wanted to include the following data in the product brochure. a. Equivalent circuit parameters for rated voltage and frequency b. Operating characteristics (efficiency, source current, at 0.25 pf. Lag, 0.5 pf lag, 0.75 pf lag and unity pf and should suggest the load corresponding to the maximum efficiency c. Regulation characteristics with respect to power factor (zpf leading to zpf laging) d. Approximately show the variation in hysteresis loss, eddy current loss, constant losses and...
ECET 212 ELECTRICAL POWER &MOTORS QUESTIONS 1. Transformer regulation can be determined with the formula a....
ECET 212 ELECTRICAL POWER &MOTORS QUESTIONS 1. Transformer regulation can be determined with the formula a. (EPRI-ESEc) / EPRI x100% b. (ENL- EFL)/ EFL x100% c. (IPRI-ESEC) / IPRI×100% d. (INL-IFL) / INL X 100% 2. What is the transformer regulation if the no-load and full-load voltages are 100 V and 95 v respectively? a. 105% b. 10.5% C. 95% d. 5.3% 3. The secondary voltage can rise above its rated value when the load is a. resistive b. capacitive...
2) A 50kVA, 2400/240V single phase transformer has the test measurements: (20) Open circuit test: 240V,...
2) A 50kVA, 2400/240V single phase transformer has the test measurements: (20) Open circuit test: 240V, 5.0A, 450W (HV open) Short circuit test: 55V, 20.8A, 600W (LV short) a Caleulate the transformer equivalent circuit parameters and draw the transformer equivalent circuit. b) Find the voltage regulation and efficiency when the transformer is connected to a load that is 75% of the rated load current at 0.8 pf lagging. c) Find the voltage regulation and efficiency when the transformer is full...
Problem 2: A 10 KVA 2200/220 V, 50 Hz transformer core and full load copper losses are given as PCore = 153 W, PCu = 224 W. a) Find the maximum efficiency b) Determine the all-day efficiency under following load pattern: 1. 2 hrs at 5/4 load 2. 6 hrs at full load 3. 8 hrs at 2 load 4. 4 hrs at 4 load 5. 4 hrs at no load
Q2.) A 60KVA, Single phase 3300/400 V transformer gave the following test results. Table 2.1 Open circut test 3300V applied to primary, power taken 430W Short circuit test Primary Input power is 525 watts Calculate the efficiency at a) full load at 0.7 power factor b) Half load at 0.7 power factor ) An ideal transformer connected to a 240V mains, supplies a 12V, 150W lamp. Calculate a) Transformer turns ratio b) The current taken from the supply. [2] [2]...
Q-1 A 60Hz, 480V/240V,960V A transformer is supplying a 960W passive load at 240V. The resistances of the primary side and secondary side of the transformer are 1.092 and 0.252 respectively. If the no load losses of the transfomer is given by P-Vã 4800 W where Vn is the input voltage of the transformer in Volt. Answer the following: a) Calculate transformer efficiency b) Do you allow this transformer to be connected to 240V 50Hz distribution system? Explain. c What...
7. A transformer is rated at 75kVA, with a primary voltage of 32kV. When tested under "Full Load" condition, its copper loss is 870W and core loss is 320W. If an industrial load rated at 1500V with a pf = 0.76 is connected to the secondary, determine: a) The transformation ratio. b) Total power loss at "one-third load". c) Efficiency of the transformer at "one-third load". d) Primary and secondary currents at "one-third 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...
Q2: A single-phase 10 KVA, 2400/240 V, 50 Hz transformer used in distribution network has the following wattmeter reading: (10 X 3 = 30 Marks) Open-circuit Test wattmeter reading: 100 W (at rated voltage) Short-circuit Test wattmeter reading: 60 W (test conducted at 50% load condition) (a) Calculate the efficiency of the transformer when it delivers full load at 0.8 pflagging. (b) Calculate the output when transformer operating at maximum efficiency and also calculate the maximum efficiency. (c) Load on...
1. A transformer manufacturing firm wanted to include the following data in the product brochure. a. Equivalent circuit parameters for rated voltage and frequency b. Operating characteristics (efficiency, source current, at 0.25 pf. Lag, 0.5 pf lag, 0.75 pf lag and unity pf and should suggest the load corresponding to the maximum efficiency c. Regulation characteristics with respect to power factor (zpf leading to zpf laging) d. Approximately show the variation in hysteresis loss, eddy current loss, constant losses and...
ECET 212 ELECTRICAL POWER &MOTORS QUESTIONS 1. Transformer regulation can be determined with the formula a. (EPRI-ESEc) / EPRI x100% b. (ENL- EFL)/ EFL x100% c. (IPRI-ESEC) / IPRI×100% d. (INL-IFL) / INL X 100% 2. What is the transformer regulation if the no-load and full-load voltages are 100 V and 95 v respectively? a. 105% b. 10.5% C. 95% d. 5.3% 3. The secondary voltage can rise above its rated value when the load is a. resistive b. capacitive...
2) A 50kVA, 2400/240V single phase transformer has the test measurements: (20) Open circuit test: 240V, 5.0A, 450W (HV open) Short circuit test: 55V, 20.8A, 600W (LV short) a Caleulate the transformer equivalent circuit parameters and draw the transformer equivalent circuit. b) Find the voltage regulation and efficiency when the transformer is connected to a load that is 75% of the rated load current at 0.8 pf lagging. c) Find the voltage regulation and efficiency when the transformer is full...
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