Calculate the equivalent series impedance of the transformer as referred to the high-voltage terminals. (b) Calculate the equivalent series impedance of the transformer as referred to the low-voltage terminals.
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.
The nameplate on a 25-MVA, 60-Hz single-phase transformer indicates that it has a voltage rating of 8.0-kV:78-kV. A short-circuit test from the high-voltage side (low-voltage winding short
circuited) gives readings of 4.53 kV, 321 A, and 77.5 kW. An open-circuit test is conducted from
the low-voltage side and the corresponding instrument readings are 8.0 kV, 39.6 A, and 86.2 kW.
(a) Calculate the equivalent series impedance of the transformer as referred to the high-voltage
terminals.
(b) Calculate the equivalent series impedance of the transformer as referred to the low-voltage
terminals.
(c) Making appropriate approximations, draw a T equivalent circuit for the transformer.
(d) Determine the efficiency of the transformer if it is supplying rated load (unity power factor)
at rated voltage at its low-voltage terminal
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