Scope of Testing
Distribution / Power Transformer ( Oil Filled, Cast Resin transformers )
| Type of test/Properties measured/Range of measurement |
Standard specifications/ Equipment/Techniques used |
| Dielectric Test on main circuit a. Power Frequency withstand voltage – up to 450 kV b. Lightning Impulse voltage/chopped wave - up to 900 kV peak c. Insulation resistance test – up to 5 kV / 950 GΩ |
IEC 60076-1 Edition 3 2011-04 IEC 60076-3 Edition 3.1 2018-03 IEC 60076-11Edition 2 2018-08 |
| Temperature rise test up to 50 MVA
Induced AC voltage test (ACSD) with partial discharge measurement |
IEC 60076-1 Edition 3 2011-04 IEC 60076-11 Edition 2 2018-08 IEC 60076-2 Edition 3 2011-02 IEC 60076-1 Edition 3 2011-04 IEC 60076-3 Edition 3.1 2018-03 IEC 60076-11 Edition 2 2018-08 |
| Sound level test | IEC 60076-1 Edition 3 2011-04 IEC 60076-10 Edition 2 2016-03 |
| Sweep frequency response analysis | IEC 60076-1 Edition 3 2011-04 IEC 60076-18 Edition1 2012-07 |
| Measurement of voltage ratio & check of phase displacement | IEC 60076-1 Edition 3 2011-04 |
| Measurement of winding resistance | IEC 60076-1 Edition 3 2011-04 |
| Measurement of oil BDV up to 100 kV | IEC 60076-1 Edition 3 2011-04 IEC 60156 Edition 3 2018-08 |
| Measurement of dissolved gases in oil | IEC 60076-1 Edition 3 2011-04 ASTM D3612-2 2017 IEC 60567 Edition 4 2011-10 |
| Measurement of capacitance and tan δ of oil and transformer | IEC 60076-1 Edition 3 2011-04 |
| Hydraulic pressure deflection /pressure test on transformer and cable box/Vacuum deflection | IEC 60076-1 Edition 3 2011-04 |
| Measurement of No load loss and current with testing facility of 1000 kVA regulator, 500 kVA intermediate transformer (11-22-33 kV) | IEC 60076-1 Edition 3 2011-04 |
| Measurement of zero phase sequence impedance | IEC 60076-1 Edition 3 2011-04 |
| Measurement of short circuit impedance and load loss with testing facility of 1000 kVA regulator, 1000 kVA intermediate transformer (1.1 kV to 11.5 kV) and HT capacitor 16.5 MVAR | IEC 60076-1 Edition 3 2011-04 |
| Test on on-load tap changer | IEC 60076-1 Edition 3 2011-04 |
| Leak testing with pressure for oil filled transformer | IEC 60076-1 Edition 3 2011-04 |
| Verification of Degree of protection Up to IP55 | IEC 60529 Edition 2.2 2013-08 |
| Temperature rise test | IEC 62271-202 Edition 3 2022-06 |
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