a) A two-winding transformer is rated at 20 KVA, 480/120 V. When operated as a conventional two-winding transformer at r

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A A Two Winding Transformer Is Rated At 20 Kva 480 120 V When Operated As A Conventional Two Winding Transformer At R 1 (13.78 KiB) Viewed 43 times

a) A two-winding transformer is rated at 20 KVA, 480/120 V. When operated as a conventional two-winding transformer at rated load, 0.8 lagging power factor, its efficiency is 92%. The transformer per-unit impedance is Zeq = 0.1480" pu. This transformer is to be used as a 120/600 V step-up auto-transformer in a power distribution system, for this auto-transformer, determine: i) The KVA rating of the transformer. ) The efficiency with the KVA loading of part (a) with 0.8 lagging power factor. iii) The per-unit impedance of the transformer.