Power System Safety Oil
Derived from natural petroleum through a series of intricate distillation and purification steps, transformer oil is a synthetic mineral oil. Its primary chemical constituent, naphthenic hydrocarbon, comprises approximately 80% of its overall composition, while the remaining parts consist primarily of aromatic hydrocarbons and alkanes. This oil is known for its stable physical properties, including a relative density of 0.895, a freezing point that is generally under 45°C, and a flash point that is no lower than 136°C.
Product Details： Power System Safety Oil
Insulating oil, additionally referred to as liquid insulating medium or dielectric fluid, serves as a vital liquid in isolating conductors carrying varying potentials. By substituting air and filling voids within or amidst solid materials' poles, it enhances dielectric performance and facilitates efficient heat dissipation in electrical devices. As a crucial insulating component in such equipment, mastering its proper utilization and maintenance guarantees seamless operation and safety.
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
A transformer's design life significantly influences the longevity of its oil. Usually, the design life is determined by the anticipated service life of the oil. Thus, within this design timeframe, the transformer oil must fulfill the operational needs of the transformer. Additionally, environmental conditions such as elevated temperatures, humidity, and pollution can impact the lifespan of transformer oil. When exposed to unfavorable conditions, the oil's aging process accelerates, resulting in a shorter lifespan.
2. Oil Change Inspection
Chromatography is utilized to detect dissolved gases in transformer oil, including hydrogen, methane, and ethane. The detection of these gases may highlight concerns such as overheating, electrical discharges, or other abnormalities in the transformer, as well as potential aging or contamination of the oil. It is vital to refer to national or industry standards for transformer oil quality. If the analysis shows that the oil falls below these standards, it may be necessary to replace the transformer oil.
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