Features :

1. Core
   
   The core is made of grain-oriented cold-rolled silicon steel sheet cut for step-lapping and laminated in the step-lap core lamination line from Georg Co. in Germany. In this way, the distribution of magnetic lines is improved and flux density in the step-lap joint is reduced. Owing to excellent equipment, quality silicon steel sheets and advanced technology, no-load performance of the core is greatly improved. Compared with traditional cores, no-load losses, no-load current and noise level have been reduced by 5%-6%, 20%-30% and 6% respectively.
   
   
2. Windings
   
   The windings are made of cast-resin high voltage windings. The HV winding is made in section-layer form, and LV winding is foil construction. Winding assembly is cast in the vacuum resin casting machine from Hedrich Co. in Germany. The resin materials are provided by CIBA-GEIGY Co. in Switzerland. The advanced technologies ensure minimum partial discharge and high ability of withstand short-circuit.
   
   HV winding tapping range: +/-5% & ± 2% on-load regulation.
   
   Temperature control device: Its functions are as follows: fault alarm, over temperature alarm and tripping, three-phase scanning, start and stop of air ventilation. It also can be equipped with computer remote interface.
   
   Cooling device: Axial fans are of low noise, even blast and easy installation. Forced cooling can enhance the capacity of transformers.

Technical Specification :

• Voltage class: 11kV, 33kV
• Power Capacity: 3-20,000kVA
• Type of cooling: AN or AF
• Enclosure / Guard class: IP00, IP20, IP23
• Thermo-tolerance class of insulation: F
• Insulation level:
  • for 10kV class: LI75AC35;
  • for 33kV class: LI170AC70
• Off circuit tap links
• On Load Tap Changer
• Winding Sensors with Scanner