Q. What is the need of doing ratio test?
A. We will check the ratio according to manufacture specification.
PROCEDURE:
1. Remove all external connections.
2. Open the secondary winding.
3.Apply voltage(available voltage like230 V) primary point or tan delta point to earth point which was removed from earth.
4.Note down the secondary voltage by using multi meter.
5. Check the ratio by dividing primary voltage by secondary voltage.
6. Repeat the same test for different tappings.
7.Discharge the charge after completion of test.
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