Transformer oil needs to be tested periodically to ensure that it is still fit for continued use because the oil will deteriorate over time. Testing sequences and procedures are defined by various international standards, many of them set by ASTM and IEEE.
Testing consists of measuring breakdown voltage and other physical and chemical properties of the oil within the system,
TESTS |
METHOD |
STANDARD SCREEN | ANNUAL |
|---|---|---|---|
| Acid Number | D974 | ✔ |
✔ |
| Dielectric Strength | D877 / D1816 | ✔ |
✔ |
| Dissolved Gas | D3612 | ✔ |
|
| Interfacial Tension | D971 | ✔ |
✔ |
| Karl Fischer Water | D1533 | ✔ |
|
| Oxidation Inhibitor DBPC & DBP | D4768 | ✔ |
|
| Specific Gravity | D1298 | ✔ |
✔ |
| Power Factor 25/100C | D924 | ✔ |
|
| Visual/Color | D1524 | ✔ |
✔ |
Additional Tests Include: Corrosive Sulfur (D1275B), Fire Point (D92), Flash Point (D92), Furan Analysis (D5837), Particle Count (ISO 4406), PCB Detection (D4059), Spectrometric Analysis (Modified D5185 & D4951), Viscosity (D445)
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