Top 5 Benefits of Using Electrical Paper Pressboard in Power Transformers

In the operation of power transformers, insulating materials play a vital role, and their performance directly affects the safety, stability and service life of transformers. As an insulating material widely used in power transformers, electrical paperboard has many significant advantages in ensuring efficient and reliable operation of transformers due to its unique performance. Electrical paperboard is a kind of hard paperboard made of plant fiber (mainly wood fiber) as the main raw material through pulping, papermaking, calendering and other processes. It has uniform thickness and dense structure, smooth surface and no impurities, and can be processed into various shapes and sizes according to different needs. The following is a detailed introduction to the five advantages of using electrical paperboard in power transformers.

1. Excellent electrical insulation performance

Electrical paperboard has a high dielectric constant and high breakdown voltage, which can effectively isolate the high and low voltage components of the transformer to prevent arcing and short circuits; under high electric fields, the dielectric loss of electrical paperboard is low, which can reduce energy loss and heat generation.

Application scenarios: Electrical paperboard is used for insulation between winding layers, insulation between windings and iron cores, and insulation of high-voltage leads to ensure that electrical clearances and creepage distances meet standards.

2. Good mechanical strength

The electrical paperboard has a tight structure, strong compression and tear resistance, can withstand mechanical stresses such as electromagnetic force and vibration during transformer operation, and maintains a stable shape for a long time.

Application scenarios: Electrical paperboard is used as a spacer between windings, a stay, etc. to provide support, and is used for insulation of winding ends, insulation support of tap changers, and insulation isolation of structural parts in the oil tank.

3. Outstanding heat resistance and thermal stability

The specially treated electrical paperboard can withstand normal oil temperature ≤105℃ and short-term overload high temperature, and age slowly; the electrical paperboard has a low thermal shrinkage rate and is dimensionally stable when the temperature changes.

Application scenarios: Electrical paperboard is suitable for insulation of dry-type transformer windings, oil-immersed transformer winding oil channel partitions, and low-temperature insulation systems of high-temperature superconducting transformers.

4. Compatible with transformer oil

Electrical paperboard easily absorbs transformer oil to form an "oil-paper" composite insulation system to improve insulation strength and heat dissipation capacity; electrical paperboard has no adverse reaction with transformer oil, and is not easy to decompose or produce impurities after long-term use.

Application scenarios: Electrical paperboard is used for insulation of oil-immersed transformer windings after oil immersion, moisture-proof layer of outdoor transformers, and environmentally friendly transformer insulation materials.

5. Environmental protection and economy

The main component of electrical paperboard is natural cellulose, which is degradable and renewable, and has little environmental burden after being discarded; electrical paperboard has a wide source of raw materials, mature manufacturing technology, and is cheaper than most synthetic insulation materials, which can meet most transformer insulation needs.

Application value: Electrical paperboard not only ensures the performance of the transformer, but also takes into account environmental protection and cost-effectiveness.

Electrical paperboard has become an indispensable key material in power transformers with its comprehensive advantages in electrical insulation, mechanical strength, heat resistance, compatibility with transformer oil, and environmental protection and economy. It not only provides a solid guarantee for the safe and stable operation of the transformer, but also plays an important role in promoting the transformer industry to develop in the direction of high efficiency, environmental protection, and economy. Its application value has been fully confirmed and widely recognized in the field of power equipment.