Technology
Winding
Cooling Ability
The directed flow construction adopted in the windings provides paths for insulating oil to flow rapidly and evenly. This increases cooling efficiency and reduces the hottest-spot temperature.
Mechanical Strength
Continuously transposed cable (CTC) is applied for large-capacity transformer windings to achieve high mechanical strength and significantly reduce eddy current losses.
Insulation
Conductors wrapped with thermally upgraded A class (120°C) cellulose insulation paper are used to prolong the service life of the transformers.
Drying and Compressing
The windings are dried and compressed sufficiently during manufacturing to prevent loosening insulation material caused by thermal expansion and contraction during operation.
Winding Types
- Continuous disk winding
- High series capacitance (HSC) disk winding
- Helical winding
- Cylindrical winding
Core
Number of Limb
Three-leg core construction is applied for most three-phase transformers; however, on occasion, three-phase five-leg construction is used for significant capacity ratings of the transformers to reduce the height to meet the transportation height limit. It is also applied for huge capacity ratings to minimize the negative influence of leakage flux and increase the mechanical strength of the tank.
High Grade Material
We adopt high-grade, high permeability, grain-oriented, cold-rolled silicon steel strips for core laminations. The insulation coating on the strip’s surface increases resistance and reduces eddy losses between layers. The accomplished core is painted with a heatproof and weather-proof epoxy resin as protection against rustiness
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