Variable frequency dry type transformer

The variable frequency rectifier phase shift transformer is specifically designed to provide multiphase rectified power for medium and high-voltage frequency converters. Supported by DuPont Nomex insulation, the rectifier is suitable for a wide range of medium to high voltage inverters, effectively filtering harmonics,protecting motors, dissipating heat, and preventing flames.

 Rectifier phase shift transformer design includes 9-phase, 12-phase, 18-phase, and 27-phase rectifier frequency conversion transformers, available in both self-cooled and air-cooled types. These transformers are distinguished by their compact size, strong overload capacity, low partial discharge, high short-circuit resistance, flame retardancy, low noise, and 40% energy savings.

Technology Innovation

Vacuum-Pressure Impregnating Process:

1. 1. Vacuum-pressure impregnate core and coil assembly in polyester varnish.
   2. Apply one cycle polyester protective shield of varnish to core and coils, cured on core and coil assembly following established temperature-versus-time baking cycle in hot-air circulating oven.

Reduced Harmonics: The secondary side uses an extended delta connection to reduce harmonic components in the input current.

Industry Pioneer: One of the earliest Chinese manufacturers to pass testing by the National Transformer Quality Supervision and Testing Center.

Scale Advantage: A large scale manufacturer of high-capacity frequency conversion transformers in China.

Advanced Secondary Design: Features a phase-shifted secondary side with a layered structure for the leads, an aesthetical design.

Product Features

1. NOMEX paper Insulation: Provide class-C insulation with other benefits including heat-resistant, flame retardant, fireproof, and non- polluting.

     2.  Cold-rolled Silicon Steel Sheet: The core material is made of high-quality cold-rolled silicon steel sheet carefully stacked at a full 45° angle.  Advanced Process: The core adopts a through-core positioning structure with a multi-stage stepping process.Under various working conditions, the core has no lateral or longitudinal displacement.

3. Delta Connection: The secondary side adopts an extended delta connection to reduce the harmonic components of the input current.
4. Removable Assembly Structure: The partition plate can be removed or assembled .
5. High Mechanical Strength: High mechanical strength, strong short-circuit resistance, safe and reliable operation.

6. Harmonic Filtering: Use multiple technologies to effectively suppress the harmonic content and filter the harmonics, extending the life of the motor.

7. Safe and Reliable: The winding adopts a variety of structural types, with strong short-circuit resistance and a dedicated air- cooling guide system with high heat dissipation efficiency.

8. High Efficiency and Energy Saving: strong overload capacity, energy saving of about 40%, low partial discharge and low noise.

9. Large Capacity and High-pulse Rectification: Diverse structures match various frequency conversion systems. The maximum product capacity can reach 9000kVA with 72-pulse rectification.

10. Tailor-Made: Self-owned factory customize on demand, flexible design and fast response.

Vacuum Pressure Impregnated (VPI) transformers are vacuum pressure impregnated with a high temperature polyester varnish. VPI ventilated dry-type transformers are designed to meet most commercial and industrial applications. VPI transformers provide excellent mechanical and short circuit strength, no danger of fire or explosion, and no liquids to leak.