Three single-phase two-winding transformers, each rated 3 kVA, 220/110 volts, 60 Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended D autotransformer bank, as shown in Figure 3.36 (c). The low-voltage D winding has a 110-volt rating. (a) Draw the positive sequence phasor diagram and show that the high-voltage winding has a 479.5-volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
Three-Phase Transformers
Three-segment transformers are a type of transformer used to transform voltages of electrical systems into three ranges. Two type transformers are shell-type transformer and core type transformer. In brief, it could be described because of the exquisite kinds of configurations.
Transformer
Ever since electricity has been created, people have started using it in its entirety. We see many types of Transformers in the neighborhoods. Some are smaller in size and some are very large. They are used according to their requirements. Many of us have seen the electrical transformer but they do not know what work they are engaged in.
Three single-phase two-winding transformers, each rated 3 kVA, 220/110
volts, 60 Hz, with a 0.10 per-unit leakage reactance, are connected as a
three-phase extended D autotransformer bank, as shown in Figure 3.36 (c).
The low-voltage D winding has a 110-volt rating. (a) Draw the positive sequence
phasor diagram and show that the high-voltage winding has a
479.5-volt rating. (b) A three-phase load connected to the low-voltage
terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw
the per-unit impedance diagram and calculate the voltage and current at
the high-voltage terminals. Assume positive-sequence operation.
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