Why G10 Fiberglass Sheet Is the Preferred Insulation Material for Dry-Type Transformers

G10 fiberglass sheet has become the insulation material of choice for dry-type transformers due to a combination of outstanding material performance, manufacturing adaptability, cost-effectiveness, and environmental sustainability. This article explores the key reasons behind this widely adopted selection.

1. Excellent Insulation Performance 

In electrical equipment, the performance of insulation materials directly impacts operational safety and reliability. G10 fiberglass sheet is made from alkali-free glass fibers reinforced with epoxy resin, and the composite structure  delivers outstanding electrical insulation. It effectively isolates electrical current, preventing breakdowns and leakage, and ensures stable operation of dry-type transformers under high-voltage and high-current conditions. Its stable and long-lasting insulation performance makes it an ideal choice for transformer applications.

2. High Mechanical Strength

During operation, dry-type transformers are subject to various mechanical stresses such as electromagnetic forces, thermal expansion, and external vibration. G10 fiberglass sheet offers high flexural, compressive, and impact strength, enabling it to withstand these stresses without deformation or damage. This helps maintain the structural integrity of the transformer and prevents insulation failure caused by mechanical damage.

3. Superior Heat Resistance and Flame Retardancy

Dry-type transformers generate significant heat during operation. If the insulation material lacks heat resistance, its insulating properties may degrade or even fail. G10 fiberglass sheet provides excellent thermal resistance, with a high heat distortion temperature and low thermal expansion coefficient, making it resistant to warping or cracking under high temperatures. Additionally, its strong flame-retardant properties help prevent fire hazards, further improving the safety of the system.

4.Easy Machinability 

During the manufacturing of dry-type transformers, insulation materials must undergo cutting, drilling, and forming processes. G10 fiberglass sheet offers excellent machinability, with smooth cutting surfaces, high drilling precision, and good forming results. This contributes to lower manufacturing costs and improved production efficiency. Additionally, its superior dimensional stability ensures that it resists deformation caused by environmental factors, maintaining the manufacturing precision and operational stability of the transformer.

5. Chemical Resistance

In industrial environments, transformers may be exposed to various chemical substances such as acids, alkalis, and salts. G10 fiberglass sheet is resistant to many chemicals and can maintain stable performance in harsh conditions. This makes it a reliable material in diverse industrial applications, effectively prolonging the service life of the transformer.

6. Significant Economic Cost

Although the initial purchase cost of G10 fiberglass sheet may be higher, its outstanding performance, long service life, and low maintenance requirements offer excellent overall value. Compared to traditional insulation materials, it significantly reduces repair and replacement costs caused by insulation failure, lowering the total lifecycle cost of the transformer.

7. Environmental Sustainability

With growing awareness of environmental protection, electrical equipment manufacturers are placing increasing importance on the eco-friendliness of materials. G10 fiberglass sheet produces minimal waste during manufacturing and is recyclable. It does not release harmful substances during use, reducing environmental pollution and resource waste while aligning with principles of sustainable development.

8. Excellent Adaptability and Compatibility

In real-world applications, G10 fiberglass sheet can withstand complex working environments such as high temperatures, high humidity, and high altitudes. It is also highly compatible with metals like copper and aluminum, as well as with other insulation materials, making it a reliable component of transformer insulation systems.

With its outstanding insulation properties, high mechanical strength, excellent thermal resistance, chemical corrosion resistance, easy machinability, cost-effectiveness, and environmental sustainability, G10 fiberglass sheet has become the preferred insulation material for dry-type transformers. It ensures safe, reliable, and efficient operation of transformers, meeting the stringent demands of modern electrical systems. As technology continues to advance and applications expand, the use of G10 fiberglass sheet in dry-type transformers is expected to grow even further.

Summary

Advantage Category	Specific Performance	Impact on Dry-Type Transformers
Insulation Performance	Made of alkali-free fiberglass and epoxy resin, effectively isolates current, prevents breakdown and leakage; stable and long-lasting performance	Ensures stable operation under high voltage and high current conditions
Mechanical Strength	High flexural, compressive, and impact strength	Withstands mechanical stress during operation, maintains structural integrity, prevents insulation failure
Heat Resistance & Flame Retardancy	High heat distortion temperature, low thermal expansion coefficient, excellent flame retardancy	Maintains stable performance at high temperatures, prevents fire hazards
Machinability	Excellent workability; smooth cutting surfaces, high drilling precision, good forming quality, and dimensional stability	Meets manufacturing needs, reduces costs, improves efficiency, ensures production precision
Chemical Resistance	Resistant to various chemicals	Maintains performance in harsh industrial environments, extends service life
Economic Cost	Higher initial cost but superior performance, long lifespan, and low maintenance costs	Reduces repair and replacement expenses, lowers total lifecycle cost
Environmental Sustainability	Minimal production waste, recyclable, emits no harmful substances during use	Reduces pollution and resource waste, aligns with eco-friendly practices
Adaptability & Compatibility	Withstands complex environments; highly compatible with various materials	Adapts to diverse working conditions, forms a stable insulation system