# Question- Task 4.3 = (a) A 250 kVA, 11 000 V/400 V, 50 Hz single-phase transformer has 80 turns on the secondary. Calculate: (i) the approximate values of the primary and secondary currents; and (ii) the approximate number of primary turns; (b) The prima…

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Apply AC theory to solve problems involving transformers

(a) A 250 kVA, 11 000 V/400 V, 50 Hz single-phase transformer has 80 turns on the secondary. Calculate:

(i) the approximate values of the primary and secondary currents; and

(ii) the approximate number of primary turns;

(b) The primary and secondary windings of a 500 kVA transformer have resistances of 0.42 Ω and 0.0019 Ω respectively. The primary and secondary voltages are 11 000 V and 400 V respectively and the core loss is 2.9 kW, assuming the power factor of the load to be 0.8. Calculate the efficiency on

(i) full load; and

(ii) half load.

**1st Page:**

**2nd Page:**

Task 4.3 (4.3) (a) A250 KVA, 11 000 V/400 V, 50 Hz single-phase transformer has 80 tums on the secondary. Calculate: @ the approximate values of the primary and secondary currents; and Gi) the approximate number of primary turns (b) The primary and secondary windings of a 500 kVA transformer have resistances of 0.42 Q and 0.0019 Q respectively. The primary and secondary voltages are 11 000 V and 400 V respectively and the core loss is 2.9 KW, assuming the power factor of the load to be 0.8. Calculate the efficiency on @ fall toad; and Gi) half load.

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