A 11-kVA, 24OO--240-V, 5O-Hz transformer has a magnetic core of 41-cm^2 cross section and a mean...
A 11-kVA, 24OO--240-V, 5O-Hz transformer has a magnetic core of 41-cm^2 cross section and a mean length of 65.9 cm. The application of 2400 V causes a magnetic field intensity of 430 A-t/m rms, and a maximum flux density of 1.5 T. Determine the magnetizing current.
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A 11-kVA, 24OO--240-V, 5O-Hz transformer has a magnetic core of
41-cm^2 cross section and a mean...
Problem Solving A 3200/240-V, 60-Hz, 1-phase transformer is built on a core having an effective cross-sectional...
Problem Solving A 3200/240-V, 60-Hz, 1-phase transformer is built on a core having an effective cross-sectional area of 125 cm^2 and has 80 turns in the low-voltage winding. Calculate (a) the value of the maximum flux density in the core and (b) the number of turns in the high-voltage winding.
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm...
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect 'R and G^V losses. Assume equal series leakage reactances for the primary and the referred secondary
A 20 kVA, 60 Hz, 2400/240 V single-phase distribution transformer has been tested to determine its...
A 20 kVA, 60 Hz, 2400/240 V single-phase distribution transformer has been tested to determine its equivalent circuit. The results of the test are shown below: Open circuit Test (on low voltage side) Voc=240V, Ioc=1.028A, Poc=122W. Short circuit test (On high voltage side) Vsc=61.3V, Isc=8.33A, Psc=257W. The transformer is supplying power to a load that draws 15 kVA at 240 V. The load power factor is 0.90 lagging. Calculate the voltage regulation for this operation condition.
2. N-300, R-7, 3x3 cm of the magnetic core square cross section, negligit the reluctance of...
2. N-300, R-7, 3x3 cm of the magnetic core square cross section, negligit the reluctance of the magnetic materical+ a) the length of the air gap 1mm, has a flux density of 0.55+ L. Find the required current and the DC voltage source Il. Find the stored field energy b) Air gap 0, flux density -1.3, find the mechanical energy+
3. [Magnetic circuits – 20 points] A two-legged magnetic core with an airgap is shown in...
3. [Magnetic circuits – 20 points] A two-legged magnetic core with an airgap is shown in the below figure. The cross-sectional area of the core is A = 20 cm², the mean length of the core is l. =80 cm, and the length of the airgap is 0.06 cm. The number of turns on the coil is 200. The relative permeability of the core can be assumed to be constant and equal to 2000. The fringing effect causes a 6%...
The core of a three-phase, 50Hz, 11 000/550 V mesh/star, 300 kVA transformer has a gross...
The core of a three-phase, 50Hz, 11 000/550 V mesh/star, 300 kVA transformer has a gross cross sectional are of 13000mm2. If the core density should not exceed 1,3 testa and the stacking factor is 0,9 . calculate the emf per turn. Show all work, use drawing to show
[Magnetic circuits – 20 points] A two-legged magnetic core with an airgap is shown in the...
[Magnetic circuits – 20 points] A two-legged magnetic core with an airgap is shown in the below figure. The cross-sectional area of the core is A. = 20 cm?, the mean length of the core is l. =80 cm, and the length of the airgap is 0.06 cm. The number of turns on the coil is 200. The relative permeability of the core can be assumed to be constant and equal to 2000. The fringing effect causes a 6% increase...
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...
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...
A single phase transformer core, for use in a 50Hz electrical network, has the following magnetic...
A single phase transformer core, for use in a 50Hz electrical network, has the following magnetic characteristic Flux Density B Magnetic Field Strength H Total Core Loss 0.8 1.28 1.68 2.09297RMS Ampere-Turns/cm 1.23 1.85 2.2 2.73 Watts/k 1.0 1.1 1.2 Tesla The core has a cross-sectional area of 175cm2, the mean magnetic path length is 160cm and the density of the core material is 7.5gm/cm3. (a) If a no-load voltage ratio of 6600/231 is required, choose a suitable number of...
Problem Solving A 3200/240-V, 60-Hz, 1-phase transformer is built on a core having an effective cross-sectional area of 125 cm^2 and has 80 turns in the low-voltage winding. Calculate (a) the value of the maximum flux density in the core and (b) the number of turns in the high-voltage winding.
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect 'R and G^V losses. Assume equal series leakage reactances for the primary and the referred secondary
2. N-300, R-7, 3x3 cm of the magnetic core square cross section, negligit the reluctance of the magnetic materical+ a) the length of the air gap 1mm, has a flux density of 0.55+ L. Find the required current and the DC voltage source Il. Find the stored field energy b) Air gap 0, flux density -1.3, find the mechanical energy+
3. [Magnetic circuits – 20 points] A two-legged magnetic core with an airgap is shown in the below figure. The cross-sectional area of the core is A = 20 cm², the mean length of the core is l. =80 cm, and the length of the airgap is 0.06 cm. The number of turns on the coil is 200. The relative permeability of the core can be assumed to be constant and equal to 2000. The fringing effect causes a 6%...
[Magnetic circuits – 20 points] A two-legged magnetic core with an airgap is shown in the below figure. The cross-sectional area of the core is A. = 20 cm?, the mean length of the core is l. =80 cm, and the length of the airgap is 0.06 cm. The number of turns on the coil is 200. The relative permeability of the core can be assumed to be constant and equal to 2000. The fringing effect causes a 6% increase...
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...
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...
A single phase transformer core, for use in a 50Hz electrical network, has the following magnetic characteristic Flux Density B Magnetic Field Strength H Total Core Loss 0.8 1.28 1.68 2.09297RMS Ampere-Turns/cm 1.23 1.85 2.2 2.73 Watts/k 1.0 1.1 1.2 Tesla The core has a cross-sectional area of 175cm2, the mean magnetic path length is 160cm and the density of the core material is 7.5gm/cm3. (a) If a no-load voltage ratio of 6600/231 is required, choose a suitable number of...
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