Insulation Oil Duct Barrier for Transformer

Insulation Oil Duct Barrier for Transformer

What is an Insulation Oil Duct Barrier for Transformers?

An insulation oil duct barrier (also known as a transformer oil duct strip or cooling duct barrier) is a critical structural and dielectric component engineered for high-voltage (HV) and extra-high-voltage (EHV) oil-immersed transformers. Manufactured from high-density, unbleached electrical-grade cellulose pressboard, these barriers are specifically shaped to create and maintain uniform cooling channels within transformer windings.

In heavy electrical equipment, the oil duct barrier fulfills a dual purpose: it provides rigid mechanical support against short-circuit radial forces while allowing transformer mineral oil to circulate freely, ensuring efficient heat dissipation and localized dielectric insulation.

Technical Specifications & Parameters (IEC Compliant)

Chengrui manufactures transformer insulation oil duct barriers in strict accordance with international standards for cellulosic electrical materials, ensuring absolute operational reliability.

Raw Material Basis: 100% Unbleached Sulfate Wood Pulp

Apparent Density: 0.9~1.10 g/cm³

Compressive Strength ≥ 120 MPa

Moisture Content ≤ 6.0% 

Ash Content  ≤ 0.3% 

Oil Absorption Capacity ≥ 10.0%

Advantages of Oil Duct Barriers

1. Exceptional Compressive Resistance: During a sudden short-circuit event, transformer windings experience massive axial and radial forces. Our high-density pressboard structure prevents physical deformation, securing the cooling channels.

2. Rapid and Uniform Impregnation: The cellulose fiber matrix is optimized to rapidly absorb transformer mineral oils, preventing dangerous partial discharges (PD) caused by trapped air pockets (voids).

3. High Thermal Limits & Stability: Operates flawlessly within continuous transformer temperature cycles, exhibiting zero shrinking, swelling, or fiber degradation over decades of service.

Applications in Transformer Manufacturing

Where are insulation oil duct barriers utilized?

1. Power & Distribution Transformers:Positioned between the primary and secondary winding layers to establish core cooling ducts.

2. Instrument Transformers: Providing precise geometric spacing and dielectric barriers in compact insulation profiles.

3. Industrial Reactors & Alternators: Acting as heavy-duty structural phase separators in high-stress electrical grids.

Frequently Asked Questions

Q1: Can these insulation duct barriers be used with synthetic ester fluids?

Yes. Our 100% pure cellulose barriers are chemically neutral and offer excellent compatibility with traditional mineral transformer oils, as well as modern eco-friendly synthetic and natural ester dielectric fluids.

Q2: Do you offer customized geometries for specific winding designs?

Absolutely. We support full custom fabrication. Whether your transformer blueprint requires flat spacing strips, corrugated oil duct sheets, or pre-curved barrier segments, our CNC machining lines can deliver tolerances within ±0.1mm.