Silicone-Based Transformer Insulating Oil
Generally speaking, the insulating oil has insulation, heat dissipation cooling and arc extinguishing three major functions. Electrical equipment (transformers, reactors, transformers, oilfilled bushings, oil switches, etc.) filled with insulating oil operation reliability, to a large extent, depends on these basic characteristics of the insulating oil. Insulating oil in the transformer, reactor, inductors in the main insulation and heat dissipation cooling effect, but if there is an arc in the above equipment, but also play an arc extinguishing role; in the oilfilled casing in the main insulating effect; in the oil switch, to extinguish the arc and insulation effect.
Product Details：Silicone-Based Transformer Insulating Oil
Known interchangeably as liquid insulating material or insulating liquid, insulating oil functions as a liquid barrier separating conductors with different voltage levels. It fills gaps within or between solid poles, thereby enhancing their dielectric capabilities and facilitating better heat dissipation within electrical devices. As a fundamental insulating component, proficient handling and maintenance of insulating oil are vital for maintaining the smooth operation and safety of electrical systems.
Parameter：
Sports Event | GB2536-11 I-40°C (general purpose) Quality indicators | Typical properties | Test Methods |
Minimum Cold Commissioning Temperature (LCSET)/°C | -40 | - | - |
Functional characteristics | |||
Pour Point/°C | ≯-50 | -55 | GB/T 3535 |
Kinematic viscosity (40°C)/(mm²/s) | ≯12 | 9.0 | GB/T 265 |
Kinematic viscosity (-40°C)/(mm²/s) | ≯1800 | 1500 | |
Water content/(mg/kg) | ≯30 | 19 | GB/T 7600 |
Breakdown voltage/kV | ≮30 | 66 | GB/T 507 |
Density (20°C)/(kg/m³) | ≯895 | 886.0 | SH/T 0604 |
Dielectric loss factor (90°C) | ≯0.005 | 0.0008 | GB/T 5654 |
Refining/stabilizing properties | |||
exterior condition | clear and transparent | clear and transparent | visual assessment |
Acid value (in KOH)/(mg/g) | ≯0.01 | <0.01 | NB/SH/T 0836 |
Water-soluble acids or bases | not have | not have | GB/T 259 |
Interfacial tension/(mN/m) | ≮40 | 46 | GB/T 6541 |
corrosive sulfur | non-corrosive | non-corrosive | SH/T0804 |
Content of antioxidant (mass fraction)/% | 0.08~0.40 | 0.30 | NB/SH/T0802 |
2-Furfural content/(mg/kg) | ≯0.1 | <0.05 | NB/SH/T0812 |
Operational characteristics | |||
Oxidation stability (120°C) | - | - | NB/SH/T 0811 |
Test time: 500h | - | - | |
--Total acid value (in KOH)/(mg/g) | ≯1.2 | 0.18 | |
--Oil sludge (mass fraction)/% | ≯0.8 | 0.03 | |
--Dielectric loss factor (90°C) | ≯0.500 | 0.055 | GB/T 5654 |
HSE Characteristics | |||
Flash point (closed)/°C | ≮135 | 142 | GB/T 261 |
PCA content (mass fraction)/% | ≯3 | <3 | NB/SH/T 0838 |
Polychlorinated biphenyl (PCB) content/(mg/kg) | undetectable | not detected | SH/T 0803 |
1. Applicable Industry
High-voltage transformers: Acting as an insulating medium, transformer oil is essential for preventing arcing and short circuits, while also providing robust insulation protection in high voltage scenarios.
Distribution transformers: In low-voltage distribution systems, transformer oil assists in dissipating heat, ensuring that equipment operates within safe temperature limits and maintaining the stability of the power supply.
Generators: Transformer oils are important for insulating and cooling generators, helping to lower their internal temperatures and improve both efficiency and equipment durability.
Steam Turbines: Within steam turbines, transformer oil plays a critical role in the electrical systems by providing insulation, which is vital for safe operation under high temperature and pressure conditions.
2. Environmental Friendliness of Transformer Oil
Biodegradability: The majority of traditional transformer oils are derived from petroleum and are not biodegradable. They can remain in the environment for decades, contributing to ongoing soil and water contamination. In contrast, newer vegetable-based transformer oils, such as those from soybeans and canola, are highly biodegradable and can typically decompose within a few months. Synthetic oils, particularly ester oils, also have favorable environmental characteristics and can be naturally degraded in a relatively short time frame.
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