Three single-phase transformers, each rated 8 MVA, 39.84/7.98 kV, 60 Hz, with an

Question

Three single-phase transformers, each rated 8 MVA, 39.84/7.98 kV, 60 Hz, with an equivalent series short-circuit reactance of 0.11 per unit divided equally between primary and secondary, are connected in a three-phase bank. The high-voltage windings are Y connected and their terminals are directly connected to a 69 kV three-phase bus. The secondary terminals are all shorted together. Find the value currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are Y connected (absolute values) Find the currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are Delta connected (absolute values)

Explanation / Answer

Find Rating of Single Phase Transformer

Rating of Single Phase Transformer:

P = V x I.

Rating of a single phase transformer in kVA

kVA= (V x I) / 1000

Rating of a Three Phase Transformer

Rating of a Three Phase Transformer:

P = 3. V x I

Rating of a Three phase transformer in kVA

kVA = (3. V x I) /1000

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