Cast-Resin Transformers

Holding the expertise we are manufacturing and supplying a huge assort of Cast-Resin Dry Type Transformer. Keenly in accordance with the international standards these transformers are fabricated to ensure its reliability and trustworthiness. The vital features of these transformers are low partial discharge and matchless electric intensity, Flame resistance, high performance and reduced maintenance. These transformers are widely used for its matchless efficiency in most of the large scale companies maintaining their own substations. 

Technical Characteristics:

• The noise of transformer is originated from its core; our company adopts the first in our county the step-lap core lamination line imported from Georg Co. of Germany. The advanced technologies greatly improve the distribution of magnetic-flux in the core to reduce loss and noise.
• CAD and high quality silicon steel sheets are used and the flux density is made far lower than the saturation point, so harmonics in core and the noise are reduced.
• All clamped parts are buffered by silicon rubber and elastic components to reduce vibration and noise, and a specified resin is coated on the surface of core for sound insulation.
• Low partial discharge and high electric intensity: The solid insulation composed of quality resin and glass fiber provides high dielectric strength and low partial discharge. The breakdown voltage is not less than 34kV/mm and the partial discharge can be less than 5pC
• Flame resistance and non environment pollution: When transformer is on fire, heat generated from the composite insulation is extremely small (about 6.5mJ/kg), so that the fire can be automatically extinguished
• Damp proof: It is able to operate at 100% of relative humidity, because both the core and the winding assembly are coated with resin
• The transformer possesses high resistance to corrosion too
• It also has high ability of over-loading high thermo-stability, less dimension and weight, easy to install and maintenance free, etc
• Cast-resin dry type transformer is applicable to following cases, such as high buildings, commercial centers, airports, railway stations, wharfs, subways, plants, and underground substation 
  

Technical Specifications:

• Voltage class: 10kV, 35kV
• Model of voltage regulation: off-excitation or on-load tap changer
• Tapping range: ¡À5%, ¡À2¡Á2.5%, or ¡À3¡Á2.5%
• Power Capacity: 3-10000kVA
• Frequency: 50Hz, 60Hz
• Phase No.: single phase or three phases
• Vector Group: Yyn0 or Dyn11 or according to customers¡¯ requirements
• Impedance voltage: please see data table or according to customers¡¯ requirements
• Service condition: 100% relative humidity, ambient temperature not more than 40¡æ or according to customers¡¯ requirements
• Type of cooling: ONAN or ONAF
• Guard class: IP00, IP20, IP23
• Thermo-tolerance class of insulation: F
• Insulation level: a. for 10kV class: LI75AC35; b. for 35kV class: LI170AC70

Structure and construction features:

• 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 traditi