Types of bushing ​ Oil impregnated paper (OIP) ​ ...

Here's a detailed overview of the types of bushings you mentioned, including their construction, characteristics, and common applications:

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1. Oil Impregnated Paper (OIP) Bushings

Construction:
OIP bushings consist of layers of high-grade crepe paper wound tightly around a conductor and then impregnated with transformer-grade insulating oil under vacuum.

Characteristics:

• Excellent dielectric strength due to the oil-impregnated insulation.
• Requires a sealed construction to avoid moisture ingress.
• Typically includes an expansion system (oil reservoir or gas cushion) to accommodate thermal expansion of oil.
• Sensitive to mechanical damage and moisture.

Applications:

• Widely used in power transformers and circuit breakers.
• Standard for high-voltage applications due to their proven reliability.

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2. Resin Bonded Paper (RBP) Bushings

Construction:
RBP bushings are made from paper insulation that is bonded together using a resin, then cured. No additional oil impregnation is used.

Characteristics:

• Solid and robust mechanical structure.
• Less moisture-sensitive than OIP.
• Lower dielectric strength than OIP and RIS.
• Limited thermal performance and aging resistance.

Applications:

• Low to medium voltage equipment.
• Situations where cost-efficiency and mechanical strength are priorities.

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3. Resin Impregnated Synthetics (RIS) Bushings

Construction:
These bushings use synthetic insulation materials (e.g., non-cellulose polymers or fabrics) impregnated with epoxy or polyester resin under vacuum.

Characteristics:

• Solid insulation—no oil or gas is needed.
• Superior moisture resistance.
• Maintenance-free and more environmentally friendly.
• Good thermal and dielectric performance.
• Lighter and more compact design compared to OIP.

Applications:

• Replacing OIP bushings in modern transformer designs.
• High-voltage GIS (Gas Insulated Switchgear) and outdoor installations.

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4. Hybrid Bushings

Construction:
Combines elements from multiple bushing types—often, an RIS or RBP core with external silicone or porcelain housing, sometimes with oil or dry interface.

Characteristics:

• Tailored to combine the best properties of different technologies.
• May use composite insulators for improved seismic and pollution performance.
• Often dry-type and maintenance-free.

Applications:

• High-voltage applications requiring compactness and environmental resilience.
• Retrofits or upgrades in aging infrastructure.

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Here’s a concise short note on the types of bushings:

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Types of Bushings – Short Note

1. Oil Impregnated Paper (OIP)

   • Made with crepe paper insulation impregnated with insulating oil.
   • High dielectric strength, but sensitive to moisture.
   • Common in high-voltage transformers.

2. Resin Bonded Paper (RBP)

   • Paper insulation bonded with resin and cured.
   • Solid, robust, and cost-effective.
   • Suitable for low to medium voltage applications.

3. Resin Impregnated Synthetics (RIS)

   • Uses synthetic materials impregnated with epoxy resin.
   • Dry-type, moisture-resistant, maintenance-free.
   • Lightweight and ideal for modern, eco-friendly designs.

4. Hybrid Bushings

   • Combines features from different types (e.g., RIS core with silicone housing).
   • Designed for enhanced performance, compactness, and durability.
   • Used in retrofits and demanding environments.

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