Relationship of per unit efficiency and per unit regulation in a transformer with load at a...
Relationship of per unit efficiency and per unit regulation in a transformer with load at a unity power factor?
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Relationship of per unit efficiency and per unit regulation in a
transformer with load at a...
In a transformer load test (Resistive and at a unity power factor), what should be the...
In a transformer load test (Resistive and at a unity power factor), what should be the expected voltage regulation and primary power factor?
In a transformer load test (Resistive and at a unity power factor), what should be the...
In a transformer load test (Resistive and at a unity power factor), what should be the relationship of the primary power to the secondary load power and what should be the relationship of the primary current to the secondary current.
A 40-KVA, 50 Hz transformer was found to have an efficiency of 97% at full-load, 0.8...
A 40-KVA, 50 Hz transformer was found to have an efficiency of
97% at full-load, 0.8 power factor lagging. It was also found that
the maximum efficiency was obtained at 82% full-load, at the same
power factor. Determine the core loss Pi , copper loss at full load
Pcufl and the maximum efficiency of the transformer ηmax at 0.8
power factor lagging?
Question 1 A 40-KVA, 50 Hz transformer was found to have an efficiency of 97% at full-load, 0.8...
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...
Q.2) A transformer has its maximum efficiency of 0.98 at 15 kVA at unity power factor....
Q.2) A transformer has its maximum efficiency of 0.98 at 15 kVA at unity power factor. Compare its all-day efficiencies for the following load cycles: (a) Full load of 20 kVA 12 hours/day and no-load rest of the day. (b) Full load 4 hours/day and 0.4 full-load rest of the day. Assume the load to operate on unity power factor all day. (14 marks)
A single-phase transformer is rated at 10 kVA, 240/100 V. When the secondary terminals are open-circuited...
A single-phase transformer is rated at 10 kVA, 240/100 V. When the secondary terminals are open-circuited and the primary winding is supplied at normal voltage, the input current is 2.6 A at a power factor of 0.3 lag. When the secondary terminals are short-circuited, a voltage of 18 V applied to the primary causes the full-load current to flow in the secondary, the power input to the primary being 240 W. Calculate (a) the regulation (b) the efficiency of the...
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,...
Please do study question 4.18 4.18: For the transformer of Problem 4.15, draw approximate equivalent circuits...
Please do study question 4.18 4.18: For the transformer of Problem 4.15, draw approximate equivalent circuits as viewed from (a) the primary side and (b) the secondary side. In each case, determine (a) the efficiency and (b) the regulation if the load has a lagging power factor of 0.8. 4.15: A 230-kVA, 2300/230-V, 60-Hz, step-down, two-winding transformer has the following parameters R(H), = 1.2 ohms, X(H), = 3ohms, R(L), = 12 mohms, X(L) , = 30 mohms, R(CH), = 2...
A single-phase transformer of nominal values of 10kVA, 440/220 V and 60 Hz supplies nominal load...
A single-phase transformer of nominal values of 10kVA, 440/220 V and 60 Hz supplies nominal load at a power factor of 0.85 lagging connected to the side of low voltage. The load operates at a nominal voltage and the transformer has the following parameters: R=0.160, X,=0.48 , R=0.040, X=0.12, R900, Xy=1300. Determine: 1. The voltage regulation of the transformer. 2. The efficiency of the transformer.
Q6. A 50 Hz, 25 kVA 7200/240 V transformer has the following equivalent circuit parameters: Prima...
Please show full working
Q6. A 50 Hz, 25 kVA 7200/240 V transformer has the following equivalent circuit parameters: Primary resistance-1562, secondary resistance-0.02 Ω Primary leakage reactance-140Q, Secondary leakage reactance-0.15Q, Magnetising reactance 30 k2, Core loss resistance 200 k2 (a) The transformer is connected to two loads in parallel. The first load is 10 kW at 0.866 power factor lagging and the second load is 15kVA with a power factor of 0.8 lagging. Find the percentage regulation and power efficiency...
A 40-KVA, 50 Hz transformer was found to have an efficiency of
97% at full-load, 0.8 power factor lagging. It was also found that
the maximum efficiency was obtained at 82% full-load, at the same
power factor. Determine the core loss Pi , copper loss at full load
Pcufl and the maximum efficiency of the transformer ηmax at 0.8
power factor lagging?
Question 1 A 40-KVA, 50 Hz transformer was found to have an efficiency of 97% at full-load, 0.8...
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...
Q.2) A transformer has its maximum efficiency of 0.98 at 15 kVA at unity power factor. Compare its all-day efficiencies for the following load cycles: (a) Full load of 20 kVA 12 hours/day and no-load rest of the day. (b) Full load 4 hours/day and 0.4 full-load rest of the day. Assume the load to operate on unity power factor all day. (14 marks)
A single-phase transformer is rated at 10 kVA, 240/100 V. When the secondary terminals are open-circuited and the primary winding is supplied at normal voltage, the input current is 2.6 A at a power factor of 0.3 lag. When the secondary terminals are short-circuited, a voltage of 18 V applied to the primary causes the full-load current to flow in the secondary, the power input to the primary being 240 W. Calculate (a) the regulation (b) the efficiency of the...
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,...
A single-phase transformer of nominal values of 10kVA, 440/220 V and 60 Hz supplies nominal load at a power factor of 0.85 lagging connected to the side of low voltage. The load operates at a nominal voltage and the transformer has the following parameters: R=0.160, X,=0.48 , R=0.040, X=0.12, R900, Xy=1300. Determine: 1. The voltage regulation of the transformer. 2. The efficiency of the transformer.
Please show full working
Q6. A 50 Hz, 25 kVA 7200/240 V transformer has the following equivalent circuit parameters: Primary resistance-1562, secondary resistance-0.02 Ω Primary leakage reactance-140Q, Secondary leakage reactance-0.15Q, Magnetising reactance 30 k2, Core loss resistance 200 k2 (a) The transformer is connected to two loads in parallel. The first load is 10 kW at 0.866 power factor lagging and the second load is 15kVA with a power factor of 0.8 lagging. Find the percentage regulation and power efficiency...
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