Dry Type Transformer Coil Winding

High Low Voltage Cast Resin Copper Aluminum Winding Coil for Dry Type Transformer

The high and low voltage cast resin winding coils are critical components used in dry-type transformers, designed to deliver high reliability, superior insulation performance, and excellent thermal stability. These coils are manufactured using copper or aluminum conductors and vacuum-cast epoxy resin processes to ensure low partial discharge, strong mechanical strength, and long service life. They are suitable for transformer assembly plants, maintenance centers, and power equipment manufacturers worldwide.

Technical Specifications

Winding Type: Two Winding

Winding Material: Aluminum / Copper

Rated Capacity: 50kVA to 6300kVA

High Voltage: 6kV / 10kV / 11kV / 20kV / 33kV / 35kV

Low Voltage: 0.4kV / 3kV / 6kV or customized

Tapping Range: ±2×2.5% / ±5%

Impedance Voltage: 4% / 6% / 7% / 8%

No-Load Loss / Load Loss: available upon request

No-Load Current: as requested

Frequency: 50Hz / 60Hz

Connection Group: Yyn0 / Dyn11

Cooling Method: AN / AF

Insulation Level: F / H

Fire Safety Level: F1

Model: Dry Transformer Coil

High-Quality Manufacturing for Global Transformer Assembly

As a leading transformer component manufacturer in China, we provide high-voltage and low-voltage cast resin coils, epoxy-insulated windings, and precision-engineered transformer components that meet IEC, ANSI, and GB standards. Our product range includes resin-coated copper and aluminum conductors, vacuum-cast transformer coils, toroidal windings, and core assemblies for various dry-type transformer designs.

These coils ensure excellent compatibility with domestic and international transformer designs. With superior thermal performance, mechanical strength, and low loss characteristics, they support stable and efficient transformer operation in industrial, commercial, and utility applications. We deliver cost-effective, durable, and customizable winding solutions tailored to the needs of transformer OEMs.

High-Voltage Coil Features

The high-voltage coil is vacuum cast using epoxy resin filled with high-quality insulation fillers. This manufacturing process provides very low partial discharge, high dielectric strength, and excellent environmental resistance. The inner and outer surfaces of the winding are reinforced with glass fiber mesh plates, significantly increasing mechanical strength and improving the short-circuit withstand capability of the transformer.

Low-Voltage Coil Features

The low-voltage coil uses a foil winding structure, effectively eliminating the axial spiral angle problem found in traditional wire-wound coils and achieving more balanced ampere-turn distribution. An axial air duct design enhances heat dissipation performance. DMD epoxy resin pre-impregnated cloth is applied between layers, forming a fully solidified insulation system after curing.

Capacity and Voltage Range

Capacity Range: 50kVA to 6300kVA, suitable for diverse power distribution requirements.

Primary Voltage Options: 6kV, 10kV, 11kV, 20kV, 33kV, 35kV.

Secondary Voltage Options: 0.4kV, 3kV, 6kV or customized to customer specifications.

These high and low voltage cast resin winding coils offer excellent electrical performance, strong mechanical stability, and long-term reliability. Designed for dry-type transformers from 50kVA to 6300kVA, they meet the needs of transformer manufacturers and maintenance units across industrial, utility, and commercial sectors. With advanced insulation technology, precision engineering, and flexible customization options, they provide a dependable solution for modern transformer assembly and production.