Electro Industries/GaugeTech
Doc # E107706 V1.257-5
7.2.1.1: Three Element Loss Compensation Worksheet
QTransformer Data (from TransformerManufacturer’s Test Sheet)
Enter 3-Phase or 1-Phase values. If 3-Phase values are entered, calculate 1-Phase values by dividing
3-Phase values by three. Convert 1-Phase Loss Watts to 1-Phase kWby dividing 1-Phase Loss Watts by
1000.
Enter 3-Phase or 1-Phase values. If 3-Phase values are entered, calculate 1-Phase values by dividing
3-Phase values by three. Convert 1-Phase Self-Cooled MVAto 1-Phase kVA by multiplying by 1000.
Test Voltage is generally Phase-to-Phase for three-phase transformers. Calculate Phase-to-Neutral
Voltage by dividing Phase-to-Phase Voltage by √3. Calculate Full Load Current by dividing the (1-Phase
kW Self-Cooled Rating) by the (Phase-to-Neutral Voltage) and multiplying by 1000.
Company
Date
Trf Manf
Calculation by
Station Name
Trf Bank No.
Trf Serial No.
ConnectionWinding Voltage MVA
HV - High ∆- Y
Xv - Low
YV - Tertiary
∆- Y
∆- Y
Watts Loss
1-Phase3-Phase 1-Phase kW
Value
No-Load Loss
Load Loss
Value 3-Phase MVA 1-Phase MVA 1-Phase kVA
Self-Cooled Rating
% Exciting Current
% Impedance
Value Phase-to-Phase Phase-to-Neutral
Test Voltage (volts)
Full Load Current (Amps)