Calculate the short circuit current of a 3-phase delta-wye connected transformer if the short circuit occurs...
Calculate the short circuit current of a 3-phase delta-wye connected transformer if the short circuit occurs between phase A and the neutral at the low voltage side. The transformer is supplied by a 12.5kV line-to-line voltage. The transformer rating is 50kVA, 12.5kV/500V and 9.2% (leakage reactance)
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Calculate the short circuit current of a 3-phase delta-wye
connected transformer if the short circuit occurs...
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...
Question 2: Three phase circuit. (100p) A wye connected generator supplies a delta connected balanced load...
Question 2: Three phase circuit. (100p) A wye connected generator supplies a delta connected balanced load through short feeder. seree the load line to neutral voltage as reference voltage phase angle zero. 02.1 Q2.2 Q2.3 Q2.4 Draw the equivalent circuit. 10p Calculate the load line-to-neutral voltages and line-to-line voltages. 20p Calculate the delta load currents and feeder currents. 20p Calculate the supply wye connected generator line-to-neutral voltages. Is the obtained values are acceptable? Calculate the generator real and reactive power...
Given a 3-phase WYE transformer at tached to WYE connected loads, each having a value of...
Given a 3-phase WYE transformer at tached to WYE connected loads, each having a value of 100 2, and the phase voltage, Vp 100 V, determine the line voltage and line current for each load. (a) 100 V@1A (c) 100 V@ 1.73 A (b) (d) 173 V@1A 173 V @ 1.73 A For a balanced 3-phase system the power (S) may be determined according to the formula S 3 VL IL VA (volt-amperes). A 3-phase, WYE-connected, 200-k V A alternator...
A 50-kVA, 13,800/208-V, Delta to Wye connected distribution transformer has an equivalent resistance of 3 percent...
A 50-kVA, 13,800/208-V, Delta to Wye connected
distribution transformer has an equivalent resistance of 3 percent
and a reactance of 9 percent per unit.
(a) what's the transformers phase impedance referred to the high
side voltage?
(b) what's the transformers voltage regulation at full load and 0.9
PF leading?
equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation...
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20...
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load 120 KVA, 90KW (lagging power factor) at rated terminal voltage of 208V Determine a) b) c) The approximate equivalent circuit referred to the low-voltage side The primary voltage The transformer efficiency Please show the following: Circuit with the values given & found Equations used
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load...
Three single-phase transformers are connected in delta-delta configuration to step up a line voltage of 8...
Three single-phase transformers are connected in delta-delta configuration to step up a line voltage of 8 kV to 120 kV. A 24 MVA load at angle 30 is connected to the high voltage side. Calculate: a) Transformer turns ratio b) Load power in MW c) Line current in HV and LV sides d) The apparent power supplied by each transformer e) If one transformer is removed for maintenance, what is the reduction percentage in the transformer bank power rating with...
Problem 4 Three ideal single-phase transformers are connected in a delta/wye configuration with the primary side of the...
Problem 4 Three ideal single-phase transformers are connected in a delta/wye configuration with the primary side of the three-phase transformer rated at 120 kV and the secondary side rated at 13.8 kV. The rated power of the transformer bank is 20 MVA. One side of the transformer bank is connected to a 120 kV transmission line, and the other side is connected to a three-phase load of 15 MVA at 0.85 lagging power factor. Compute the following: a) The turns...
A delta-wye connected transformer is shown in Figure below. This is a 220 kV to 450...
A delta-wye connected transformer is shown in Figure below. This is a 220 kV to 450 kV transformer, line-line, RMS. The 'X' side is the 220 kV side. Assume that Phase A voltage on the X' side has zero phase angle (that is, use VaX as the phase reference) 1) What is the turns ratio NX: NH? 2) Draw phasor diagrams of the primary and secondary voltages. Be sure to get relative phase angles right. 3) If a balanced load...
I need ANSWER OF THIS QUESTIONS a - In a balanced wye connected circuit, if the...
I need ANSWER OF THIS QUESTIONS a - In a balanced wye connected circuit, if the line-to-line voltage was 346V, what would the line-to-neutral voltage be? b - In the unbalanced wye circuit, did I1+I2+I3 = IN (assuming the phase currents were all separated by 120˚)? c - If a balanced delta circuit had a line current of 600 Amps, what would the magnitude of the phase current be?
4-9 Question Completion Status: QUESTION 4 A three phase delta source is connected to a three...
4-9
Question Completion Status: QUESTION 4 A three phase delta source is connected to a three phase transformer. The primary of the transformer is connected in a delta configuration The line voltage on the primary is 240V. The turns ratio is 2:1. The secondary of the transformer is connected in a wye configuration. A wye connected load is attached to the secondary of the transformer. Each of the three load resistors has a resistance of 10 ohms. What is the...
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...
Question 2: Three phase circuit. (100p) A wye connected generator supplies a delta connected balanced load through short feeder. seree the load line to neutral voltage as reference voltage phase angle zero. 02.1 Q2.2 Q2.3 Q2.4 Draw the equivalent circuit. 10p Calculate the load line-to-neutral voltages and line-to-line voltages. 20p Calculate the delta load currents and feeder currents. 20p Calculate the supply wye connected generator line-to-neutral voltages. Is the obtained values are acceptable? Calculate the generator real and reactive power...
Given a 3-phase WYE transformer at tached to WYE connected loads, each having a value of 100 2, and the phase voltage, Vp 100 V, determine the line voltage and line current for each load. (a) 100 V@1A (c) 100 V@ 1.73 A (b) (d) 173 V@1A 173 V @ 1.73 A For a balanced 3-phase system the power (S) may be determined according to the formula S 3 VL IL VA (volt-amperes). A 3-phase, WYE-connected, 200-k V A alternator...
A 50-kVA, 13,800/208-V, Delta to Wye connected
distribution transformer has an equivalent resistance of 3 percent
and a reactance of 9 percent per unit.
(a) what's the transformers phase impedance referred to the high
side voltage?
(b) what's the transformers voltage regulation at full load and 0.9
PF leading?
equivalent resistance of 3 percent and a reactance of 9 percent per unit. (a) What is the transformer's phase impedance referred to the high-voltage side? (b) Calculate this transformer's voltage regulation...
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load 120 KVA, 90KW (lagging power factor) at rated terminal voltage of 208V Determine a) b) c) The approximate equivalent circuit referred to the low-voltage side The primary voltage The transformer efficiency Please show the following: Circuit with the values given & found Equations used
A 150 KVA, 2080/208-V, 3 PHASE, delta-wye transformer with the following: RH 450m2 R 4.5m XH 2.20 Load...
Problem 4 Three ideal single-phase transformers are connected in a delta/wye configuration with the primary side of the three-phase transformer rated at 120 kV and the secondary side rated at 13.8 kV. The rated power of the transformer bank is 20 MVA. One side of the transformer bank is connected to a 120 kV transmission line, and the other side is connected to a three-phase load of 15 MVA at 0.85 lagging power factor. Compute the following: a) The turns...
A delta-wye connected transformer is shown in Figure below. This is a 220 kV to 450 kV transformer, line-line, RMS. The 'X' side is the 220 kV side. Assume that Phase A voltage on the X' side has zero phase angle (that is, use VaX as the phase reference) 1) What is the turns ratio NX: NH? 2) Draw phasor diagrams of the primary and secondary voltages. Be sure to get relative phase angles right. 3) If a balanced load...
4-9
Question Completion Status: QUESTION 4 A three phase delta source is connected to a three phase transformer. The primary of the transformer is connected in a delta configuration The line voltage on the primary is 240V. The turns ratio is 2:1. The secondary of the transformer is connected in a wye configuration. A wye connected load is attached to the secondary of the transformer. Each of the three load resistors has a resistance of 10 ohms. What is the...
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