An In-depth Analysis of Electrical Composite Coaming Board: A Key Material for Power System Safety
In modern electrical power systems, the stable and safe operation of transformers is paramount, and this reliability hinges on high-performance insulation materials. Among these, the “Electrical Composite Coaming Board” stands out as a crucial special insulation material. With its superior properties, it plays an indispensable role in core electrical equipment like dry-type transformers. This article combines an easy-to-understand overview with a professional technical analysis to provide a comprehensive look at this product.
What is a “Composite Coaming Board”? – The “Insulating Armor” of Electrical Equipment
You can think of the electrical composite coaming board as the “insulating armor” inside electrical equipment. Its primary mission is to isolate live electrical parts from non-live parts, preventing current from “straying” and causing short circuits or equipment damage, thereby ensuring the safety of the entire power system.
This board is not made from a single substance. It is a multi-layer composite material produced by bonding polyester film and polyester fiber non-woven fabric with a special heat-resistant adhesive. The composite is then finished with a surface treatment of special resin. This “best-of-both-worlds” structure allows it to combine the advantages of multiple materials, resulting in performance far superior to that of any single component.
Product Features and Core Advantages
The widespread application of electrical composite coaming board in demanding electrical equipment is due to its series of outstanding physical and electrical properties.
- Excellent Mechanical and Electrical Strength: The composite structure gives the board very high mechanical strength, enabling it to withstand the vibrations and stresses of equipment operation. Simultaneously, its excellent electrical properties, particularly a high Breakdown Voltage, are fundamental to preventing electrical arcing and ensuring reliable insulation. Data shows that even after bending, its breakdown voltage can remain at a very high level (e.g., ≥30kV), which is critical for complex coil windings.
- Outstanding Thermal and Dimensional Stability: This material exhibits excellent heat resistance, with a Temperature Index (TI) reaching ≥155°C. This means it can maintain stable performance over long periods at high operating temperatures without degradation. Furthermore, its shrinkage and humidity absorption rates are very low, allowing it to maintain precise dimensions even in environments with fluctuating temperature and humidity. This is vital for ensuring the tightness and structural integrity of transformer coils.
- Superior Physical Performance Parameters:
- High Tensile Strength: It demonstrates strong resistance to pulling forces in both the machine direction (MD) and cross direction (CD) (e.g., ≥50 N/10mm), ensuring it does not easily deform or break during installation and operation.
- Good Elongation: It possesses a degree of flexibility (e.g., ≥600%), allowing it to adapt well to the bending required during the coil winding process without cracking.
Keywords: Electrical Insulation Materials, Composite Insulation, Dry-Type Transformers, Polyester Film, Non-Woven Fabric Composite, Heat-Resistant Insulation, High Breakdown Voltage, Transformer Insulating Cylinder.
Core Application Areas
Based on these superior properties, the electrical composite coaming board is primarily used for the inner casting mold of low-voltage coils in dry-type transformers. Here, it serves several critical functions:
- Insulating Barrier: It effectively isolates the low-voltage coils from the iron core or other components, preventing short-circuit faults.
- Replacement for Traditional Materials: It can effectively replace traditional epoxy resin insulating boards/cylinders, clip insulation, or end insulation, often offering better processing capabilities and cost-effectiveness.
- Structural Support: It provides a solid foundation for the coil windings, ensuring their geometric shape and dimensional accuracy.
The standard product colors are typically red or brown, though custom colors can be produced to meet user specifications.
Usage and Storage Recommendations
To ensure the product’s performance is maximized, proper handling and storage are essential.
- Recommended Width: Manufacturers typically offer a range of standard widths, such as 1000mm, 1100mm, 1200mm, and 1300mm. Tailor-made widths are also available to meet the specific production needs of different transformers.
- Storage:
- The product should be stored upright in a dry, clean, and well-ventilated warehouse.
- It must be kept away from fire, heat sources, and direct sunlight to prevent material aging or performance degradation.
- The recommended shelf life is 12 months. If the storage period is exceeded, the product must be approved by a lab test to confirm its properties are still up to standard before being used.
Conclusion
As a high-performance special insulation material, the electrical composite coaming board integrates excellent mechanical strength, electrical properties, thermal stability, and dimensional accuracy. It is a key component in guaranteeing the safe, reliable, and efficient operation of modern electrical equipment like dry-type transformers. A thorough understanding of its properties and applications not only helps equipment manufacturers optimize their designs and production but also assists power system maintenance personnel in better safeguarding the stability of the electrical grid.
| No. | Property | Unit | Requirements | |||
| 1 | Nominal thickness | mm | 0.5 | 0.83 | 0.9 | |
| 2 | Tolerance of thickness | mm | ±0.045 | ±0.066 | ±0.09 | |
| 3 | Quantify and tolerance | g/m² | 622±68 | 1085±87 | 1120±112 | |
| 4 | Thickness of film | μm | 350 | 350 | 350 | |
| 5 | Layers of film | V | 1 | 2 | 2 | |
| 6 | Elongation | MD | % | ≥350 | ≥600 | ≥600 |
| CD | ≥350 | ≥600 | ≥600 | |||
| 7 | Tensile strength | XD | N/10mm Width | ≥30 | ≥50 | |
| CD | ≥30 | ≥50 | ||||
| 8 | Breakdown Voltage | No bending | kV | ≥18 | ≥35 | ≥35 |
| Bending | ≥16 | ≥30 | ≥30 | |||
| 9 | Temperature Index (TI) | – | ≥155 | |||
We produce electrical composite coaming board by multilayer composite of polyester film and non-woven fabric,special heat resistant adhesive as the bonding naterial.And then surface treatment with special resin.The product has very high nechanical and electrical properties.The shrinkage and humidity absorption is low.And the thermal endurance property is very reliable.Electrical composite coaming board is mainly used for the winding of the low voltage coils in dry-type transformers.It can replace the insulating cylinder which material of epoxy resin insulating board,clip insulation or end insulation.
Recommended width:
1000mm、1100mm、1200mm、1300mm,Tailor-made width is available.
Storage
The product should be upright stored in dry,clean and well-ventilated warehouse.The fire,heat sources and direct sunshine should be avoided.The shelf life is recommended to be one year.The longer storage period must be approved by lab test before using.
