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. In order to meet an emergency, three single-phase transformers rated 100 kVA (each), 13.2 kV/2.4...
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...
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...
10. In order to meet an emergency, three single-phase transformers with 12.4707.200 Vrms are connected in A-Y to form a three-płuase transformer wluch is fed by a 12,470-V transmission line. If the transformer supplies 60 MVA to a lood, find (a) the tum ratio for each transformer, (b) the currents in the primary and secondary windings of the transformer, (c) the incoming and outgoing transmission line cuarents
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-...
3. Two transformers rated at 250 kVA, 2.4 kV/600 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 carry on a continuous basis?
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.
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...
Q No.1: A 14,000/130-V, three-phase, ∆-Y transformer bank consists of three identical 100-kVA, 83l4/130-V transformers. It is supplied with power directly from a large constant voltage bus. In the short-circuit test, the recorded values on the high-voltage side for one of these transformers are Vsc = 510V, Isc = 12.6 A, Psc = 3000 W (a) If this bank delivers a rated load at 0.8 PF lagging and rated Voltage, what is the line-to-line voltage on the primary of the...
A three-phase transformer bank is rated at 500 kVA and have a 34.5/12 kV voltage ratio. Find the following ratings of each individual transformer in the bank when the transformer is ∆-Y connected: high voltage, low voltage, turns ratio (a), and apparent power.