This document provides calculations to determine the resistance (R%) and reactance (X%) percentages for a 1600 kVA trihal standard transformer. It first calculates R% as 0.594% based on the transformer's full load and no load losses. It then uses the impedance relation and R% to calculate X% as 5.97%. The final X/R ratio is determined to be 10.05.

1. Example,
Trihal standardlossestype transformer,withelectrical dataasgivenbelow:
1) Calculationof R%:
R% = 100 x [(Full load loss (W)-no load loss (W))/(transformer rated power (kVA)x1000)]
= 100 x [(12300 (W)-2800 (W))/(1600 (kVA)x1000)]
= 0.594 %
2) Then, using the impedance relation; Z = √ (R² + X²), we can calculateX% to be:
X% = √ (Z%² - R%²) = √ (6² - 0.594²)
= 5.97 %,
Hence X/R = X%/R% = 5.97 / 0.594 = 10.05