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1. (25)- The circuit connection of primary and secondary windings of a three phase transformer is...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting thre...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting three single phase transformers in the Dynll vector group as shown in Fig.P1. The per phase equivalent circuit parameters on the high voltage side are: R1-0.72 Ω, Xi,-0.92 Ω, R2-0.70 Ω, Xp-0.90 Ω, R.-308.49 Ω, and X,,-44.61 Ω (a) Sketch the corresponding phasor diagram of the primary and secondary voltages for the Dynll vector group; lagging; terminal voltage is 415 V line to line, and...
A transformer consists of 290 primary windings and 842 secondary windings. PART A: If the potential...
A transformer consists of 290 primary windings and 842 secondary windings. PART A: If the potential difference across the primary coil is 29.0 V , what is the voltage across the secondary coil? Express your answer in volts to three significant figures. PART B: If the potential difference across the primary coil is 29.0 V , what is the current in the secondary coil if it is connected across a 150 Ω resistor? Express your answer in amperes to three...
1. (10 PT) A three-phase bridge rectifier circuit shown in the figure phase voltage of 220 volts rms. A load of 100 Ω is connected across is supplied by a rectifier. Both the primary and secondary...
1. (10 PT) A three-phase bridge rectifier circuit shown in the figure phase voltage of 220 volts rms. A load of 100 Ω is connected across is supplied by a rectifier. Both the primary and secondary windings of transfor Assume the transformer has a turns ratio of unity mer are Y-connected a) 3 PTI On the top of voltage plot on next page indicate the diodes that will be conducting during different intervals of time. b) 17 PT] Plot the...
A transformer with turns ratio 8:1, has the resistances of the primary and secondary windings as...
A transformer with turns ratio 8:1, has the resistances of the primary and secondary windings as 0.85 ohms and 0.012 ohm respectively, and the leakage reactances are 4.8 ohms and 0.07 ohms respectively. Determine the voltage to be applied to the primary to obtain current of 150A in the secondary when the secondary terminals are short circuited, Ignore the magnetizing current
EE 488 HW 15 For the three-phase transformers shown, the individual windings are rated: primary "...
EE 488 HW 15 For the three-phase transformers shown, the individual windings are rated: primary "H" winding 7200v secondary "X" winding 480 V tertiary "M" winding 1.4 kv The primary winding is connected to a balanced 13.2 kV (ine-line) positive sequence three-phase source. a. Calculate the 3-phase turns ratio and phase shift from the primary to the secondary windings. b. Calculate the 3-phase turns ratio and phase shift from the primary to the tertiary windings HC ХВ nA XA HA...
a) [10pts] Show/Mark all voltages and phase and line currents on the primary and the secondary...
a) [10pts] Show/Mark all voltages and phase and line currents on the primary and the secondary sides of the three phase transformer shown below. b) [20pts] Find load's currents and voltages. 15:70 30 +j15 Ω 120 20 Vm
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...
3. Three single-phase, 10 kVA, 460/120 V, 60 Hz transformers are connected to form a three-phase...
3. Three single-phase, 10 kVA, 460/120 V, 60 Hz transformers are connected to form a three-phase 460/208 V transformer bank. The equivalent impedance of each transformer referred to HV side is 1.0 + j2.0 Ω. The transformer delivers 25 kW at 0.9 pf lagging at rated voltage. Answer the following questions: (a) Draw a schematic diagram showing the transformer connection. Draw three separate single-phase transformers and complete their primary and secondary connections. (b) Determine the magnitude of transformer primary and...
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...
A balanced three-phase network supplies a balanced load through a three-phase wye-wye connected transformer as shown...
A balanced three-phase network supplies a balanced load through a three-phase wye-wye connected transformer as shown in the following figure. Transformer Supply Network B8 Load Y-Y The wye-wye connected transformer has the following parameter: S 25 MVA Xir 15% 240/132 kV The three-phase load parameters are: Pload 20 MW pfload 0.8 The three-phase supply network line voltage and short circuit current are: Vnet 225 kV Inet_short= 15 kA. A. Calculate primary and secondary current rating. B. Calculate trans former actual...
A three phase 250 kVA 2400:415 V 50 Hz distribution transformer is constructed by connecting three single phase transformers in the Dynll vector group as shown in Fig.P1. The per phase equivalent circuit parameters on the high voltage side are: R1-0.72 Ω, Xi,-0.92 Ω, R2-0.70 Ω, Xp-0.90 Ω, R.-308.49 Ω, and X,,-44.61 Ω (a) Sketch the corresponding phasor diagram of the primary and secondary voltages for the Dynll vector group; lagging; terminal voltage is 415 V line to line, and...
1. (10 PT) A three-phase bridge rectifier circuit shown in the figure phase voltage of 220 volts rms. A load of 100 Ω is connected across is supplied by a rectifier. Both the primary and secondary windings of transfor Assume the transformer has a turns ratio of unity mer are Y-connected a) 3 PTI On the top of voltage plot on next page indicate the diodes that will be conducting during different intervals of time. b) 17 PT] Plot the...
EE 488 HW 15 For the three-phase transformers shown, the individual windings are rated: primary "H" winding 7200v secondary "X" winding 480 V tertiary "M" winding 1.4 kv The primary winding is connected to a balanced 13.2 kV (ine-line) positive sequence three-phase source. a. Calculate the 3-phase turns ratio and phase shift from the primary to the secondary windings. b. Calculate the 3-phase turns ratio and phase shift from the primary to the tertiary windings HC ХВ nA XA HA...
a) [10pts] Show/Mark all voltages and phase and line currents on the primary and the secondary sides of the three phase transformer shown below. b) [20pts] Find load's currents and voltages. 15:70 30 +j15 Ω 120 20 Vm
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...
A balanced three-phase network supplies a balanced load through a three-phase wye-wye connected transformer as shown in the following figure. Transformer Supply Network B8 Load Y-Y The wye-wye connected transformer has the following parameter: S 25 MVA Xir 15% 240/132 kV The three-phase load parameters are: Pload 20 MW pfload 0.8 The three-phase supply network line voltage and short circuit current are: Vnet 225 kV Inet_short= 15 kA. A. Calculate primary and secondary current rating. B. Calculate trans former actual...
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