Low-Temperature Insulating Oil for Extreme Conditions
In switchgear, transformer oil primarily serves to extinguish arcs. When an oilimmersed switch disconnects a power load, an arc forms between the fixed and moving contacts. The temperature of this arc can reach such extreme levels that it risks burning out the equipment and can also lead to overvoltage conditions that may damage the system. During the initial opening and closing of the oilimmersed switch, the intense heat from the arc causes significant thermal decomposition of the oil, resulting in the production of approximately 70% hydrogen. Given hydrogen's high thermal conductivity (41), it can absorb considerable heat and transfer it to the surrounding oil, effectively cooling the contacts and achieving arc extinction.
Product Details：Low-Temperature Insulating Oil for Extreme Conditions
Recognized as both liquid insulating material and insulating liquid, insulating oil serves to electrically separate conductors of differing voltage levels. By occupying the spaces within or between solid poles, it strengthens dielectric characteristics and optimizes heat dissipation in electrical devices. As a vital insulating element, adept handling and maintenance of insulating oil are imperative for preserving the reliable operation and safety of electrical systems.
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. Environmental Friendliness of Transformer Oil
Low toxicity: Innovations in transformer oil formulations have produced many newer oils that are markedly less toxic, leading to a lower adverse effect on aquatic and soil-dwelling organisms.
Non-hazardous components: A number of these contemporary transformer oils use non-hazardous components, avoiding the inclusion of harmful chemicals such as polycyclic aromatic hydrocarbons (PAHs) and chlorinated compounds commonly associated with traditional oils.
2. Market Research Analysis
The market encompasses various segments, among them the less than 100 MVA segment, industrial applications, and power supply utilities. Transformer oil is essential for maintaining the stability, reliability, and power transmission capabilities of electrical systems. It addresses concerns related to thermal stress, excessive heat generation, and dielectric strength within transformers, circuit breakers, switchgear equipment, capacitors, boilers, oil processing plants, and power stations. Additionally, the market is influenced by emerging trends such as advancements in highperformance computing, the expansion of the electric vehicle market, and the deployment of HVDC transmission systems. The International Energy Agency projects a continuous growth pattern for the transformer oil market, fueled by the increasing demand for electricity and the shift towards renewable energy sources.
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