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Q No.1: A 14,000/130-V, three-phase, ∆-Y transformer bank consists of three identical 100-kVA, 83l4/130-V transformers. It...

Q No.1:

A 14,000/130-V, three-phase, ∆-Y transformer bank consists of three identical 100-kVA, 83l4/130-V transformers. It is supplied with power directly from a large constant voltage bus. In the short-circuit test, the recorded values on the high-voltage side for one of these transformers are

Vsc = 510V,     Isc = 12.6 A,        Psc = 3000 W

(a) If this bank delivers a rated load at 0.8 PF lagging and rated Voltage, what is the line-to-line voltage on the primary of the transformer bank?

(b) What is the voltage regulation under these conditions?

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Answer #1

Short ect test will give Req and xeq VSC- 5100, Isc = 12.6 Amp, Psc = 3000 watt testen Los escuro Zeq - Tez - 5.2.0 (23.09.-0eq cct (per phase per unit) Zeq = 0.0618/62.17 I 7 l Req jxeq ↑ V2 = 120 as transformer is loaded at full load PE=0.8 lagg 0(b) Voltage Voltage regulation nel Tel- lvl Tual til 1.0562 pu 151 = 1.0 pu V.R = 1.0562 - 1 V-R = 0.0562 J.V.R = 5.62%

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