Transformer Insulation Oil T-40
Insulating oil in electrical equipment is susceptible to oxidation from heat and oxygen over extended periods when influenced by an electric field. Oils that contain antioxidants and metal passivators demonstrate superior oxidative stability. Generally, at 90℃, the dielectric loss of transformer oil should remain below 0.5%. This loss reflects the oil's performance in an AC electric field, typically represented by the tangent of the dielectric loss angle (δ). Naphthenic oil is particularly suitable for manufacturing electrical appliance oils, thanks to its low pour point, excellent lowtemperature flow characteristics, and strong electrical and thermal stability.
Product Details： Transformer Insulation Oil T-40
Characterized by an impressive array of advantages, insulating oils feature robust dielectric strength, high flashpoint temperatures, low viscosity, purity from organic acids, alkalis, and sulfurinduced corrosion, outstanding antiemulsification characteristics, zero sludge accumulation under standard operating conditions, swift removal of arc waste, and a low pour temperature. These attributes combine to enable them to effectively insulate and cool electrical devices.
PARAMETER：
Sports Event | Quality Indicators | measured value | Test Methods |
Functional characteristics | |||
Pour Point/°C | -40 | -48.3 | ISO 3016 |
Kinematic viscosity (40℃)/(m㎡/s) | ≯12 | 9.46 | ISO 3104 |
Kinematic viscosity (-10°C)/(mm²/s) | ≯1800 | 1028 | ISO 3104 |
Water content/(mg/kg) | ≯30/40 | 8.6 | IEC 60814 |
Breakdown voltage/kV (untreated oil) | ≮30 | 63.7 | IEC 60156 |
Density (20°C)/(g/ml) | ≯895 | 886 | ISO 12185 |
Dielectric loss factor (90°C) | ≯0.005 | 0.00047 | IEC 60247 |
Refining/stabilizing properties | |||
exterior condition | Clear and transparent, free of sediment and suspension (of atmospheric pollution) | Clear and transparent, free of sediment and suspension (of atmospheric pollution) | visual assessment |
Acid value (mgKOH/g) | ≯0.01 | 0.0008 | IEC 62021- 1 |
Interfacial tension/(mN/m) | No general requirements | 45.3 | ISO 6295 |
Total sulfur content (mass fraction)/% | No general requirements | No general requirements | ISO 14596 |
corrosive sulfur | non-corrosive | non-corrosive | DIN 51353 |
Content of antioxidant additives (mass fraction)/percent Oil with antioxidant additives (U) | ≯0.08 | 0.063 | IEC 60666 |
2-Furfural content/(mg/kg) | ≯0.1 | 0.011 | IEC 61198 |
Operational characteristics | |||
Oxidation stability (120°C) Test time: 332h | - | - | - |
--Total acid value (in KOH)/(mg/g) | ≯1.2 | 0.04 | IEC 61125 Act C |
--Oil sludge (mass fraction)/% | ≯0.8 | 0.020 | IEC 61125 Act C |
--Dielectric loss factor (90°C) | ≯0.500 | 0.004 | IEC 60247 |
Gassing/(mm/min) | No general requirements | No general requirements | IEC 60628 |
Health Safety and Environmental Characteristics (HSE) | |||
Flash point (closed)/°C | ≮135 | 148.2 | ISO 2719 |
PCA content (mass fraction)/% | ≯3 | 0.8 | BS 2000 Part 346 |
Polychlorinated biphenyl (PCB) content/(mass fraction)(mg/kg) | undetectable | undetectable | IEC 61619 |
1. Factors Affecting Service Life
Transformer Load: When a transformer operates under heavy loads for long durations, the oil's aging process may accelerate, leading to a shorter service life. Thus, managing the transformer load effectively is crucial for ensuring the oil lasts longer.
Oil Quality: The service life of transformer oil is largely affected by its quality. Highquality transformer oil has better thermal stability and antiaging characteristics, which can help prolong its lifespan. Conversely, poorquality oil may age quickly, resulting in a shorter operational life.
2. Oil Change Inspection
Chromatography is a technique used to identify dissolved gases in transformer oil, including hydrogen, methane, and ethane. The detection of these gases can signal issues such as overheating, electrical discharges, or other irregularities within the transformer. Additionally, their presence may suggest that the oil is aging or contaminated. It's essential to adhere to national or industry standards regarding transformer oil quality. If the test results indicate that the oil does not meet these standards, replacing the transformer oil may be necessary.
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