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Synthetic ester-type transformer insulating oil
Product introduction
Synthetic ester-type transformer insulating oil is synthesized from various saturated fatty acids and pentaerythritol under special conditions. It features excellent lubricity, low expansion coefficient, outstanding insulation properties and high breakdown voltage. It also has outstanding flame retardancy, extremely high thermal oxidation stability and ultra-low moisture content. It can be widely applied in power transformers up to 238kW, traction transformers, pole-mounted transformers, transformers with branch switches, etc.
Characteristics and features
· Excellent low-temperature performance
· High flash point and high ignition point
· High breakdown voltage
· Outstanding flame retardancy
· Low coefficient of thermal expansion
· Good biodegradability
| Analyze the project | Quality indicators | Typical result | Analytical method |
|---|---|---|---|
| Appearance | Transparent and free of mechanical impurities | Transparent and free of mechanical impurities | Visual inspection |
| Density（20℃），Kg/dm³ | ≤1000 | 969.5 | SH/T0604-2000 |
|
Kinematic viscosity，m㎡/s 40℃ -20℃ |
≤35 3000 |
29.22 1350 |
GB/T265-1998 |
| Tilt point℃ | ≤-45 | -56 | GB/T3535-2006 |
| Flash point ℃ (closed) | ≥250 | 253 | GB/T261-2008 |
| Ignition point， | ≥300 | 312 | GB/T267-1998 |
|
Acid value（mgKOH/g） |
≤0.03 |
0.015 | NB/SH/T0836-2010 |
| Corrosive sulfur | Non-corrosive | Non-corrosive | SH/T0804-2007 |
|
Oxidation stability，164h Acid value（mgKOH/g） Sedimentation，%（m/m） |
≤0.3 ≤0.01 |
0.09 0.0055 |
IEC61125 C method |
| Breakdown voltage (factory with a 2.5mm spacing) | ≥45 | 62 |
GB/T507-2002 |
| Water-soluble esters or bases | no | no | GB/T259-1998 |
| Dielectric loss factor（90℃） | ≤0.03 | 0.01 | GB/T5654-2007 |
| Volume resistivity（90℃）G Ωm | ≥2 | 23.5 | GB/5654-2007 |
| Moisture，mg/kg | ≤200 | 40.3 | GB/T7600-2014 |
| Refractive index（20℃） | - | 1.454 | SH/T0724 |
| Crystallization | - | No crystallization | GB/T7533 |
*. Complies with DIN EN 61099-2020 standard
