Answer / Shailendra Misra

The reason for applying 28 kV on the high voltage (HV) side and 3 kV on the low voltage (LV) side during a high voltage test on an 11kV/433 distribution transformer is to ensure safe testing conditions. The value depends on the rated voltage of the transformer, the test requirements, and safety guidelines. It's essential to consider factors such as the insulation level of the transformer, the test equipment capabilities, and local safety regulations.

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