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a. What is the PVR of a transformer delivering rated current to a purely resistive load...
A balanced Y-connected voltage source is applied to a balanced A-connected load with Zad (45-j30) ohm/phase...
A balanced Y-connected voltage source is applied to a balanced A-connected load with Zad (45-j30) ohm/phase connected, 150 kVA transformer. According to the rating of the transformer, which is on a reactance of the transformer is j0.8 per unit (ignore the magnetizing branch impedances) LOAD 13.2kV 480V Z j0.8 pu a) Utilizing a three-phase Stue of 100 kVA and transformer voltages as bases, draw the single phase b) What does the voltage (V) at the source to need to be...
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...
Assuming that the load impedance is to be purely resistive, what load should be connected to...
Assuming that the load impedance is to be purely resistive, what load should be connected to terminals a-b of the circuits in the given figure so that the maximum power is transferred to the load? Assume R 52 Ω. 100 Ω -j10Ω 40Ω 120/60° v (+ 2/90 A j30 Ω o b The value of R is Ω.
A three-phase Yy0 connected transformer has a nominal rating of 250 kVA and a voltage ratio...
A three-phase Yy0 connected transformer has a nominal rating of 250 kVA and a voltage ratio 15:0.4 kV. After conducting the short-circuit test, where the secondary winding is short-circuited, it is found that the primary series resistance is 0.08 pu and the primary series impedance magnitude is 0.1pu. The effect of the parallel branch in the transformer’s equivalent circuit may be neglected. Explain what information ‘Yy0’ gives about the transformer. Draw the per-phase equivalent circuit of the transformer during the...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary...
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary Voltage Excitation reactance Series Impedance 150 MVA 230 kV 32 kV 30 (pu) 0.02+0.15j (pu) The transformer is Y/A connected. Answer the following questions: a) What are the nominal (rated) primary and secondary line currents?| b) What is the nominal value of the Delta-side winding (internal) current? c) What is the secondary to primary winding turn ratio? d) The transformer is supplying 150 MVA...
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...
EMM2802 MAYIJUNE 2016 QUESTION B A single phase transformer has a high voltage to low voltage...
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...
3. If the voltage and current (both are rms values) supplied to a circuit or load...
3. If the voltage and current (both are rms values) supplied to a circuit or load by a source are Varm) = 460?0° V, Is(m)-1414L-45° A. Determine the a) the power supplied by the source which is dissipated as heat or energy in the circuit, b) the power stored in the reactive components and c) the power factor angle and power factor 4. An ideal transformer is rated to deliver 460 KVA at 380 V to a customer T Customer's...
(20pts) Assume a three-phase load of(120+j40) MVA is supplied at rated voltage of69 kV generation source...
(20pts) Assume a three-phase load of(120+j40) MVA is supplied at rated voltage of69 kV generation source through the below network. The three-phase 138/69 kV transformer has a se impedance of (5.06+ 23.7a equivalent on the high voltage side. The distribution feeder that connects the load has a series impedance ofJ4 Ω. Using perunítanalysis with SB키00MVA, 2. determine: (a) The voltage (kV) and the current (A) at the generation source terminal (b) The total complex power provided by the generation source....
R Figure shows the equivalent circuit of a transformer rated at 1000 kVA, 13.8kV. It has a magnetizing current of 2A a)...
R Figure shows the equivalent circuit of a transformer rated at 1000 kVA, 13.8kV. It has a magnetizing current of 2A a) Find Lm if f 60 Hz b) Using value of Lm obtained in (a), find Zo if C 3 nF c) If I 3A due to harmonic distortion, find out the transient voltage V
R Figure shows the equivalent circuit of a transformer rated at 1000 kVA, 13.8kV. It has a magnetizing current of 2A a) Find Lm...
A balanced Y-connected voltage source is applied to a balanced A-connected load with Zad (45-j30) ohm/phase connected, 150 kVA transformer. According to the rating of the transformer, which is on a reactance of the transformer is j0.8 per unit (ignore the magnetizing branch impedances) LOAD 13.2kV 480V Z j0.8 pu a) Utilizing a three-phase Stue of 100 kVA and transformer voltages as bases, draw the single phase b) What does the voltage (V) at the source to need to be...
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...
Assuming that the load impedance is to be purely resistive, what load should be connected to terminals a-b of the circuits in the given figure so that the maximum power is transferred to the load? Assume R 52 Ω. 100 Ω -j10Ω 40Ω 120/60° v (+ 2/90 A j30 Ω o b The value of R is Ω.
Problem 1: A three-phase transformer has the following name plate data: Rated Power Primary voltage Secondary Voltage Excitation reactance Series Impedance 150 MVA 230 kV 32 kV 30 (pu) 0.02+0.15j (pu) The transformer is Y/A connected. Answer the following questions: a) What are the nominal (rated) primary and secondary line currents?| b) What is the nominal value of the Delta-side winding (internal) current? c) What is the secondary to primary winding turn ratio? d) The transformer is supplying 150 MVA...
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...
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...
3. If the voltage and current (both are rms values) supplied to a circuit or load by a source are Varm) = 460?0° V, Is(m)-1414L-45° A. Determine the a) the power supplied by the source which is dissipated as heat or energy in the circuit, b) the power stored in the reactive components and c) the power factor angle and power factor 4. An ideal transformer is rated to deliver 460 KVA at 380 V to a customer T Customer's...
(20pts) Assume a three-phase load of(120+j40) MVA is supplied at rated voltage of69 kV generation source through the below network. The three-phase 138/69 kV transformer has a se impedance of (5.06+ 23.7a equivalent on the high voltage side. The distribution feeder that connects the load has a series impedance ofJ4 Ω. Using perunítanalysis with SB키00MVA, 2. determine: (a) The voltage (kV) and the current (A) at the generation source terminal (b) The total complex power provided by the generation source....
R Figure shows the equivalent circuit of a transformer rated at 1000 kVA, 13.8kV. It has a magnetizing current of 2A a) Find Lm if f 60 Hz b) Using value of Lm obtained in (a), find Zo if C 3 nF c) If I 3A due to harmonic distortion, find out the transient voltage V
R Figure shows the equivalent circuit of a transformer rated at 1000 kVA, 13.8kV. It has a magnetizing current of 2A a) Find Lm...
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