SG(B)11–18 Series Non-Encapsulated H-Class Dry-Type Power Transformer
Product Introduction
The SG(B) series non-encapsulated H-class dry-type transformer is manufactured using specialized MORA dry-type transformer technology from Germany.
This design enables the transformer to meet fire-resistance, waterproofing and environmental protection requirements. It is a suitable solution for modern power distribution systems.
The transformer is widely used in subways, ships, mines, chemical plants, power companies, densely populated buildings and other locations with strict safety and fire-protection requirements.
Model Number and Meaning
SG(B) Series Non-Encapsulated H-Class Dry-Type Power Transformer Performance Features
- Excellent heat dissipation and overload capacity:
The transformer provides effective heat dissipation and a long thermal service life. It can operate continuously at full load under IP45 conditions without forced-air cooling and can withstand long-term operation at 120% load. - High safety and flame-retardant performance:
The transformer offers strong fire resistance and produces no smoke during prolonged burning at temperatures up to 800°C. - Strong thermal shock resistance:
It can be loaded immediately to full capacity at temperatures as low as -50°C. - Excellent waterproof and moisture-resistant performance:
The transformer features complete waterproof sealing, strong water repellency and reliable moisture resistance. - Low partial discharge:
Its special coil structure and precise electric field calculation help minimize local partial discharge. - Low loss and high energy efficiency:
Compared with the SC9 series dry-type transformer, the average no-load loss is reduced by 10%, while the load loss is reduced by 5%. - Easy recycling:
At the end of the transformer’s service life, the insulating materials and copper conductors can be easily separated and recycled without causing environmental pollution.
SG(B) Series Non-Encapsulated H-Class Dry-Type Power Transformer Structural Features
- Special porcelain insulation structure:
The transformer uses MORA insulating cylinders and high-frequency ceramic spacers, providing a stable structure that does not deform. - High- and low-voltage coil construction:
The high- and low-voltage coils are first insulated with NOMEX insulating material. They are then repeatedly vacuum-pressure impregnated with specially formulated H-class insulation using VIP equipment and baked several times.
The outer surface is sealed with high-strength insulating material and cured at high temperature. The high-voltage coil uses a continuous structure with high mechanical strength and effective heat dissipation. - Low-loss and low-noise core:
The core is made from imported high-quality, high-permeability silicon steel sheets and uses a 45-degree fully mitred step-lap structure.
Elastic fixing devices are used between the windings and the core to reduce no-load loss and operating noise.
The core surface is treated with a special process and is moderately secured with tie rods. The upper and lower clamps are connected by tie plates and fixed to the base and windings.
Elastic pads secure the windings, while the buffering structure reduces winding vibration and operating noise. - Lead and terminal arrangement:
The lead terminals are positioned at the top of the winding, the tap connections are located in the middle, and the low-voltage terminals use plate-type conductive busbars connected by cold-pressure welding.
