Cast Resin Transformer

Varelen technology: What makes our factory are different?

Varelen electric used most advanced production technology and the most control systems to guarantee the transformer products quality and total product reliabliity.

• Manufactured in accordance with IEC, AS, EN, IEEE/ANSI, GOST

1. Magnetic core:

The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel laminations insulated on both sides, guaranteeing low losses and low noise. These values are even improved by laser treatment. It is protected on the surface with a flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.

2. Clamping frame:  it is processed by CNC cutting, bending and then one-time punch forming, the hole’s size is accurate and the appearance looks delicate.

3. HV and LV winding: The winding coil is made of oxygen-free copper, class H for main insulation materials and coil is insulated by NOMEX paper of DUPONT brand, LV winding is isolated by copper foils. All these make the heat-resistant is up to 220℃, with excellent overload capacity and low loss, but high efficiency.

4. Varelen practices strictly exclusive casting system of F(155℃) or H(180℃), and the epoxy resin is injected and casted in the vacuum machine, so it’s highly insulated, dust-proof and moisture-proof, which ensures stable and reliable performance.

cast resin transformers provide solutions for:

• ✅Operation in grids subject to harmonic distortion
• ✅Switching surges and lightning overvoltages
• ✅Extreme environmental conditions:
• ✅very hot climates, e.g. desert regions
• ✅high environmental exposure (salt, air humidity, gases)

• ✅High short-time overload requirement, e.g. up to 450 % of the rated power

• ✅Mean long-term loads up to 140 % of the rated power with fans

• ✅Power systems requiring a high degree of availability
• ✅Loads due to switching surges (vacuum circuit-breakers)
• ✅High demands regarding mechanical oscillations (crane, excavator, seismic areas, ships)