This document outlines 12 test procedures for testing transformers on site, including measuring winding resistance, voltage ratios, short circuit impedance, no-load loss and current, insulation resistance, temperature rise, capacitance and loss factor, zero-sequence impedance, air pressure, unbalance current, magnetic balance, and vacuum integrity.

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Test Procedure of Transformer Testing at Site
1 Measurement of Winding Resistance.
2 Measurement of voltage ratio and check of voltage vector
relationship.
3 Measurement of Short Circuit impedance and load loss.
4 Measurement of No-load loss and current.
5 Measurement of Insulation Resistance.
6 Temperature Rise Test.
7 Measurement of capacitance and loss factor.
8 Measurement of zero-sequence impedance (s) on three-phase
transformer.
9 Measurement of Air Pressure Test.
10 Measurement of Unbalance current.
11 Magnetic balance test on three phase transformer.
12 Vaccum test.