Homework Answers
Each transformer rating is 250 kva
So total kva supplied by delta connection = 3× 250. = 750 KVAd
opendelta connection kva supplied = 0.5773×750= 433KVA
So connection is not overloaded.
b) without over loading the connection can carry the maximum loading of 433 KVA.
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3. Two transformers rated at 250 kVA, 2.4 kV/600 V are connected in open-delta to supply...
clear and neat Problem 8 Two transformers rated at 250 k VA, 2.4 k V/ 1600...
clear and neat
Problem 8 Two transformers rated at 250 k VA, 2.4 k V/ 1600 V are connected in open delta to supply a load of 400 kVA a. Are the transformers overloaded? b. What is the maximum load the bank can carryon a continuous basis?
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-...
2. In order to meet an emergency, three single-phase transformers rated 100 kVA (each), 13.2 kV/2.4...
2. In order to meet an emergency, three single-phase transformers rated 100 kVA (each), 13.2 kV/2.4 kV are connected in Y-∆ on a 3-phase, 20 kV line. a. What is the maximum load that can connected to the transformer bank? b. What is the outgoing line voltage?
2. Three single-phase transformers rated at 300 KVA, 7200 V/600 V, 60 Hz, are used to...
2. Three single-phase transformers rated at 300 KVA, 7200 V/600 V, 60 Hz, are used to raise the voltage of a 3-phase, 600 V line to 7.2 kv. a. How must they be connected? b. Calculate the line currents for a load of 750 kVA. C. Calculate the corresponding primary and secondary currents.
Two single phase transformers are supplying a 400 kVA load at 220V. The parameters related to...
Two single phase transformers are supplying a 400 kVA load at 220V. The parameters related to each transformer give in the following: T1: , 250 kVA 120V/220 V T2: , 250 kVA 120V/220 V How much kVA each transformer has to supply. If the load becomes 550 kVA will any of the transformers be overloaded?
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
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 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...
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 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...
clear and neat
Problem 8 Two transformers rated at 250 k VA, 2.4 k V/ 1600 V are connected in open delta to supply a load of 400 kVA a. Are the transformers overloaded? b. What is the maximum load the bank can carryon a continuous basis?
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-...
2. Three single-phase transformers rated at 300 KVA, 7200 V/600 V, 60 Hz, are used to raise the voltage of a 3-phase, 600 V line to 7.2 kv. a. How must they be connected? b. Calculate the line currents for a load of 750 kVA. C. Calculate the corresponding primary and secondary currents.
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
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...
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...
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