Fire-Resistant Electrical Insulation Fluid
According to the different composition, electrical insulating oil can be divided into mineral insulating oil and synthetic insulating oil. Mineral insulating oil is refined from petroleum liquid insulating materials. Synthetic oil for cable mainly dodecylbenzene (for selfcapacitating oilfilled cable), polybutene (for steel pipe oilfilled cable) and a small number of flame retardant cable with silicone oil. At present, mineral insulating oil is still dominant, so often said electrical insulating oil usually refers to mineral insulating oil.
Product Details：Fire-Resistant Electrical Insulation Fluid
In electrical equipment, transformer oil can be different potential (potential) of the charged part of the isolation, so that it does not form a short, road. Because the dielectric constant of air is 1.0, while the dielectric constant of transformer oil is 2.25. That is to say, the insulating strength of oil is much greater than that of air. Hypothetically, a coil of transformer oil exposed to air will quickly be punctured when running. If the transformer coils are filled with transformer oil between them, the insulating strength is increased, they will not be punctured, and as the quality of the oil improves, the greater the safety factor of the equipment.
Parameter：
Sports Event | Quality Indicators | measured value | Test Methods |
Functional characteristics | |||
Pour Point/°C | -50 | -57.5 | ISO 3016 |
Kinematic viscosity (40℃)/(m㎡/s) | ≯12 | 9.52
| ISO 3104 |
Kinematic viscosity (-10°C)/(mm²/s) | ≯1800 | 1028 | ISO 3104 |
Water content/(mg/kg) | ≯30/40 | 9.0 | IEC 60814 |
Breakdown voltage/kV (untreated oil) | ≮30 | 64.5 | IEC 60156 |
Density (20°C)/(g/ml) | ≯895 | 886 | ISO 12185 |
Dielectric loss factor (90°C) | ≯0.005 | 0.0005 | 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 | 0.065 | IEC 60666 |
2-Furfural content/(mg/kg) | ≯0.1 | 0.012 | 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. Electrical Performance Testing
The Dielectric Efficiency Factor reflects the amount of energy dissipated by transformer oil under electric field conditions, facilitating an understanding of the oil's electrical health and potential issues such as contamination or aging.
The Dielectric Strength evaluation determines the transformer oil's threshold for electrical stress tolerance. A low dielectric strength could signify increased likelihood of electrical breakdown, affecting equipment performance.
The Specific Resistance measurement ensures transformer oil's conductivity remains within acceptable limits, a prerequisite for uninterrupted power equipment operation.
2. Market Challenges
The volatility in crude oil prices has a profound effect on the transformer oil market's landscape. According to the International Energy Agency's figures, the average crude oil price was USD73.6 per barrel in October 2018, but this escalated to over USD100 per barrel in the first half of 2022. The unpredictable nature of these oil price fluctuations can upset the oil and gas industry, posing investment risks for the global transformer oil market, which relies substantially on naphthenic and paraffinic mineral oils for transformer use. Consequently, the transformer oil market is poised to encounter challenges during the forecast period due to the instability in crude oil prices.
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