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4. Three ideal single-phase transformers are connected as shown below. The turns ratio of each single-phase...
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...
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...
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...
Draw schematic (connection) diagrams for three-phase Y-Y and Y-Δ connected transformers using three single-phase (50 VA,...
Draw schematic (connection) diagrams for three-phase Y-Y and Y-Δ connected transformers using three single-phase (50 VA, 120V/25V) transformers you have previously worked with in the lab. Show proper dot markings for each configuration. I. 2. Find the line-line voltage ratio (VuVa) for each configuration. For a three-phase Δ-connected resistive load (25 Ω in each leg), connected on the transformer low voltage side, calculate the line current on each side of the transformer for each configuratio Is it safe to operate...
1. In order to meet an emergency, three single-phase transformers with 12.470/7.200 V are connected in...
1. In order to meet an emergency, three single-phase transformers with 12.470/7.200 V are connected in Delta-Wye to form a three-phase transformer which is fed by a 12.470 V transmission line. If the transformer supplies 60 MVA to a load, calculate: (3 marks) a. The turns ratio for each transformer b. The currents in the primary and secondary windings of the transformer c. The primary and secondary transmission line currents 2. A Wye-Delta transformer is connected to a 66 kV...
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 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...
Three single-phase transformers are connected in a wye-delta configuration to step down a line voltage of...
Three single-phase transformers are connected in a wye-delta configuration to step down a line voltage of 13.8kV to 4160V to supply an industrial facility. The plant draws 8MW at a 0.80 power factor. Transformer impedances can be neglected. Calculate the following: a. the apparent power (SL) drawn by the load/plant. b. the apparent power (Ss) furnished by the HV source. c. the current in the HV lines (141) d. the current in the LV lines (112) e. the currents in...
A tie breaker is accidently closed that parallels three single phase transformers each rated 500 kVA...
A tie breaker is accidently closed that parallels three single phase transformers each rated 500 kVA connected delta primary wye secondary, with a three phase 1500 kVA transformer connected delta-delta. The equivalent impedance of the delta transformer is 0.056 at an angle of 58o. The equivalent impedance of the wye transformers is 0.022 at an angle of 58o. Both transformer have 12.47kV to 480V. All feeder breakers are open. Calculate the magnitude of the current circulating in each transformer secondary,...
A 3-phase, 50 Hz, 6600 /1000 /440 Y V. transformer (HELP)
Question: A 3-phase, 50 Hz, 6600 /1000 /440 Y V. transformer. (i) What is the purpose of using three winding transformers? (ii)Determine suitable numbers of turns to ensure the peak flux does not exceed 0.03 Web. (ii) Determine the primary line current and power factor if the 1000 V winding delivers a balanced load of 100 kVA at 0.8 power factor lagging and the 440 V winding delivers a balanced load of 50 kW at unity power factor.
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...
Draw schematic (connection) diagrams for three-phase Y-Y and Y-Δ connected transformers using three single-phase (50 VA, 120V/25V) transformers you have previously worked with in the lab. Show proper dot markings for each configuration. I. 2. Find the line-line voltage ratio (VuVa) for each configuration. For a three-phase Δ-connected resistive load (25 Ω in each leg), connected on the transformer low voltage side, calculate the line current on each side of the transformer for each configuratio Is it safe to operate...
1. In order to meet an emergency, three single-phase transformers with 12.470/7.200 V are connected in Delta-Wye to form a three-phase transformer which is fed by a 12.470 V transmission line. If the transformer supplies 60 MVA to a load, calculate: (3 marks) a. The turns ratio for each transformer b. The currents in the primary and secondary windings of the transformer c. The primary and secondary transmission line currents 2. A Wye-Delta transformer is connected to a 66 kV...
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...
Three single-phase transformers are connected in a wye-delta configuration to step down a line voltage of 13.8kV to 4160V to supply an industrial facility. The plant draws 8MW at a 0.80 power factor. Transformer impedances can be neglected. Calculate the following: a. the apparent power (SL) drawn by the load/plant. b. the apparent power (Ss) furnished by the HV source. c. the current in the HV lines (141) d. the current in the LV lines (112) e. the currents in...
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