Question

1. What should be the required turns ratio of a three-phase transformer to transform 10 MVA from 230 kV to 4160 V if the transformer is to be connected delta-wye. (4 pts) 2. A three-phase 150 kVA, 4160 V, 0.8 lagging pf load is to be supplied by three single- phase transformers having turns ratio of 2. Calculate the current that flows in the primary windings if the transformers are connected delta-delta. (5 pts) 3. Two single-phase transformers are to be connected open-delta. What is the minimum kVA rating of each transformer if the load to be supplied is 200 kW at 0.85 pf lagging. (5 pts) 4. Three single-phase transformers are connected to make a three phase delta-wye bank. The line voltages of the bank are 2200 volts and 400 volts on the primary and the secondary, respectively. The load on the transformers is 15 kW, 0.8 pf lagging, wye connected. Determine the currents in the primary windings of the bank. (5 pts) 5. Three 10:1 single-phase transformers are connected wye-delta. Determine the secondary line to line voltage if the primary is connected across 4600 volts mains. (5 pts)

          1. What should be the required turns ratio of a three-phase transformer to transform 10
MVA from 230 kV to 4160 V if the transformer is to be connected delta-wye. (4 pts)
2. A three-phase 150 kVA, 4160 V, 0.8 lagging pf load is to be supplied by three single-
phase transformers having turns ratio of 2. Calculate the current that flows in the
primary windings if the transformers are connected delta-delta. (5 pts)
3. Two single-phase transformers are to be connected open-delta. What is the
minimum kVA rating of each transformer if the load to be supplied is 200 kW at 0.85
pf lagging. (5 pts)
4. Three single-phase transformers are connected to make a three phase delta-wye
bank. The line voltages of the bank are 2200 volts and 400 volts on the primary and
the secondary, respectively. The load on the transformers is 15 kW, 0.8 pf lagging,
wye connected. Determine the currents in the primary windings of the bank. (5 pts)
5. Three 10:1 single-phase transformers are connected wye-delta. Determine the
secondary line to line voltage if the primary is connected across 4600 volts mains. (5
pts)

1. What should be the required turns ratio of a three-phase transformer to transform 10
MVA from 230 kV to 4160 V if the transformer is to be connected delta-wye. (4 pts)
2. A three-phase 150 kVA, 4160 V, 0.8 lagging pf load is to be supplied by three single-
phase transformers having turns ratio of 2. Calculate the current that flows in the
primary windings if the transformers are connected delta-delta. (5 pts)
3. Two single-phase transformers are to be connected open-delta. What is the
minimum kVA rating of each transformer if the load to be supplied is 200 kW at 0.85
pf lagging. (5 pts)
4. Three single-phase transformers are connected to make a three phase delta-wye
bank. The line voltages of the bank are 2200 volts and 400 volts on the primary and
the secondary, respectively. The load on the transformers is 15 kW, 0.8 pf lagging,
wye connected. Determine the currents in the primary windings of the bank. (5 pts)
5. Three 10:1 single-phase transformers are connected wye-delta. Determine the
secondary line to line voltage if the primary is connected across 4600 volts mains. (5
pts)

Added by Danielle A.

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