Find out the efficiency at full load Assignment Help

Assignment Help: >> Three-Phase Transformer Connections - Find out the efficiency at full load

Find out the efficiency at full load:

An open circuit test for core losses in a 10 kVA transformer [Example (1)] gives a reading of 70 W.  If the PF of the load is 90%, find out the efficiency at full load.

Solution:

Eff. = VSIS x PF / (VSIS x PF) + Copper Loss + Core Loss x 100  

VSIS = transformer rating =10kVA =10,000 VA     

PF = 0.09; Copper loss = 100 W; Core loss =70 W

Eff. = (10,000(0.90)/10,000(0.90) + 100+70) x 100 - 99000/9170) x 100 - 98.2%

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