Page 271 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

Fig 16

To find the copper losses
Calculations from SC test data

Calculations from SC test data
V2
Let k =
V1
I2Z02 = V sc

V
Z 02 = I2 sc

Z
02
Z 01 = K² also,
W
I2²R = W , R = sc
02 sc 02 I2²
R 02
R 01 = K² ,

X 01 = √Z01² - R01²

Polarity test on transformer (Fig 17)

• If voltmeter indicates zero, transformers polarities are same
• If voltmeter indicates twice the rated voltage, transformers polarities are different

Fig 17

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CITS : Power - Electrician & Wireman - Lesson 41-49