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![ANSWER SAC ARENT PO (0) APPARENT POWER (50) - BMW - 10 MVA: (0) APPARENT POWER (53) = 10 MVA Citroe 8MW 0.8 NT neglected] no](http://img.homeworklib.com/questions/caffe4f0-2701-11eb-b270-f3019e4fc6f7.png?x-oss-process=image/resize,w_560)
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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 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...
A 100 MVA, 66 kV/230 kV, Delta- Wye three phase transformer is protected by a differential...
A 100 MVA, 66 kV/230 kV, Delta- Wye three phase transformer is protected by a differential relay. Current transformer ratio at the LV side is 1000 :5 A. a) Sketch connection of differential relays to the transformer b) Current transformers available for use at the HV side are 800:5, 600:5, 400:5 and 200:5. Select the suitable CT ratio. c) Sketch the phasor diagram to show currents in current transformers windings and power transformers windings d) Calculate the percentage of the...
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...
Three single phase step-up transformers rated at 40 MVA, 13.2 kV/80 kV are connected in delta-wye on a 13.2 kV transmission line
a. Three single phase step-up transformers rated at 40 MVA, 13.2 kV/80 kV are connected in delta-wye on a 13.2 kV transmission line. If they feed a 90 MVA load calculate the following: i. The secondary line voltage ii. The current in the transformer windings iii. The incoming line currents iv. If the transformer types are two (2) additive and one (1) subtractive draw the connection diagram for the configuration stated using physical representation. b. A 3-phase squirrel cage motor has twelve (12) leads (labelled 1 to...
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...
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye- delta on a 12.47 kv, 3-phase line. If the load is 450 kVA, calculate: a. The currents in the incoming a...
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye- delta on a 12.47 kv, 3-phase line. If the load is 450 kVA, calculate: a. The currents in the incoming and outgoing transmission lines b. The currents in the primary and secondary windings 1. sratod t 200 w 3o0 v/6oO V 60 Hz are used to raise the
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye-...
1. Three single-phase step-up transformers rated at 75 MVA, 13.2 kV/80 kV are connected in delta-...
1. Three single-phase step-up transformers rated at 75 MVA, 13.2 kV/80 kV are connected in delta- wye on a 13.2 kV transmission line. If they feed a 180 MVA load, calculate the following: a. The secondary line voltage b. The currents in the primary and secondary windings C. The incoming and outgoing transmission line currents
3. A balanced three-phase delta connected load with 15+j10 ohms load on each balanced, wye connected...
3. A balanced three-phase delta connected load with 15+j10 ohms load on each balanced, wye connected source with Van branch is supplied by a -7.6240 KV, while the transmission line impedances are 1+7j on each line. Calculate the line currents (currents on the transmission lines) la, 1b, and 1c. (Hint: convert the Δ configured load into a Y configured load
A three-phase electrical heater dissipates 50kW when connected to a 4160V, 3-phase line. (a) Draw the...
A three-phase electrical heater dissipates 50kW when connected to a 4160V, 3-phase line. (a) Draw the circuit diagram and indicate system parameters (line to line voltage, currents, fuses, etc.) if the loads (resistors) are connected in WYE. (b) What is the LINE current if the resistors are all connected in WYE? (c) Draw the circuit diagram and calculate the LINE current if the resistors are all connected in DELTA? (d) While the delta connected load resistors are working fine, and...
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j...
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
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...
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...
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye- delta on a 12.47 kv, 3-phase line. If the load is 450 kVA, calculate: a. The currents in the incoming and outgoing transmission lines b. The currents in the primary and secondary windings 1. sratod t 200 w 3o0 v/6oO V 60 Hz are used to raise the
Three single-phase transformers rated at 250 kVA, 7200 V/600 V, 60 Hz, are connected in wye-...
1. Three single-phase step-up transformers rated at 75 MVA, 13.2 kV/80 kV are connected in delta- wye on a 13.2 kV transmission line. If they feed a 180 MVA load, calculate the following: a. The secondary line voltage b. The currents in the primary and secondary windings C. The incoming and outgoing transmission line currents
3. A balanced three-phase delta connected load with 15+j10 ohms load on each balanced, wye connected source with Van branch is supplied by a -7.6240 KV, while the transmission line impedances are 1+7j on each line. Calculate the line currents (currents on the transmission lines) la, 1b, and 1c. (Hint: convert the Δ configured load into a Y configured load
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
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