Dong Anh Manufacturing Electrical Equipment JSC (DONGANHMEE) is the only company in today’s transmission transformer repair market with a mobile vapour-phase vacuum drying system, which lets DONGANHMEE repair transformers directly on site with clear advantages:
1. Repair time cut by 30%
For failed transformers that need urgent repair, on-site repair with the mobile drying unit minimises downtime (repair time reduced by 30%) by eliminating transport from the site to the factory and back to the substation for installation. This matters most for high-voltage, high-capacity units such as 500kV transformers, which are extremely difficult and time-consuming to move to a repair shop.
2. Repair cost cut by 25%
Transporting a transformer to the repair shop and back accounts for 25–30% of the total repair cost, so eliminating transport saves about 25% of the repair cost.
3. Lower transport risk
Because the transformer is repaired at the substation, the risks of shipping it to the factory and back are avoided.
4. Adapts quickly to any site and terrain
The mobile drying unit is split into small modules that are easy to transport to any location and terrain, allowing it to adapt quickly to any substation conditions.
5. Superior repair quality
Results from on-site repairs with the mobile drying unit have been very good – in particular, insulation values after drying far exceed those achieved with traditional on-site drying methods.
DONGANHMEE has successfully dried a 225kV/250MVA transformer on site at the Ninh Binh 220kV substation.
