Electrical Protection Varnish for Oil Transformers
Electrical Protection Varnish for Oil Transformers is a specialized functional coating developed to meet the unique challenges faced by oil-immersed transformer components. It is formulated with a modified epoxy resin base, incorporates performance-enhancing additives, and is produced via specialized manufacturing techniques. This varnish provides outstanding electrical insulation performance, crucial for maintaining dielectric integrity within the transformer. It is also formulated for excellent weatherability and resistance to yellowing. The Electrical Protection Varnish for Oil Transformers has a low viscosity for easy application, cures at ambient temperature for operational convenience, and offers superb processing characteristics. The cured film is bright, transparent, and demonstrates extremely strong adhesion.
A defining and critical property of this Electrical Protection Varnish for Oil Transformers is its exceptional compatibility with transformer oil. The cured film is designed to withstand long-term, continuous immersion in insulating oil without softening, dissolving, or losing its adhesive bond. This makes it a specifically tailored functional coating for protecting the iron cores of oil-immersed transformers, where it must perform reliably for decades in a hot, oil-filled environment.
Basic parameters of the product before mixing
|
Components |
Main agent |
Curing agent |
Reference Standards |
|
Color |
transparent |
transparent |
- |
|
Viscosity 40℃ (mpa.s) |
220~240 |
68~80 |
GB/T24148.4-2009 |
|
Density (g/mL)) |
1.05~1.10 |
1.10~1.12 |
GB/T6750-2007 |
Process Characteristics
Thoroughly clean the surface of the iron core before applying the insulating coating.
Take the required amount of component A.
Strictly adhere to the A:B ratio of 2:1 when adding component B to the mixer containing component A. Mix components A and B thoroughly before use.
Pot life: 30-40 minutes at 25℃ (100g mixture). For best results, ensure the coating is applied within 40 minutes of thorough mixing. Otherwise, it will affect the feel and adhesion after curing.
Curing conditions: Surface dry in 4 hours at 25℃, fully cured in 24 hours. Curing time will vary depending on ambient temperature.
Product Characteristics After Curing
|
Testing items |
Oil to Varnish |
Reference Standards |
|
Tensile strength(MPa) |
60~66 |
GB/T 15022.2-2017 |
|
Tensile modulus of elasticity (MPa) |
10.76~12.21*10³ |
GB/T 15022.2-2017 |
|
Bending strength (MPa) |
121~129 |
|
|
Flexural modulus (MPa) |
10.22~10.96*10³ |
|
|
Impact strength (KJ/m²)) |
12~20 |
|
|
Compressive strength (MPa) |
139~156 |
|
|
Hardness (Shored) |
79~83 |
|
|
Volume resistivity (Ω·m) |
1014 |
|
|
Surface resistivity (Ω·m) |
1014 |
|
|
Electrical strength (MV/m) |
26 |
Packaging Specifications
Main Agent: 20 KG; Hardener: 10 KG / 5 KG
Shelf Life and Storage Conditions
Shelf life: 180 days. After the shelf life, the product must pass inspection before use. Store in a well-ventilated, dry place away from fire.
Precautions
The activation period for this product is 40-50 minutes. Please prepare and use immediately. Do not pour unused portion into unmixed products. Ensure proper sealing during storage; otherwise, component B may deteriorate and affect the product's effectiveness.
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