27,5-35kV Three-phase power transformers ТД, ТДН(С), ТРДН(С) type

27,5-35kV Three-phase power transformers ТД, ТДН(С), ТРДН(С) type

ТД, ТДН(С), ТРДН(С) three-phase oil-immersed blow-cooled power transformers (hereinafter called as "Transformers") are designed to convert electrical energy of power supply grids, as well as to fed different consumers of AC 50 Hz, including auxiliary power plants needs.
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THE TRANSFORMERS TECHNICAL DATA

ТД type drawings  ТДНС type drawings  ТРДНС type drawings rated power, kVA

Upper rated limit, kV

 Windings scheme and connection group short circuit voltage, %  Type, range and number of voltage control stages on the HV side
HV LV
      6300 36,75 10,5 Y/∆-11
Yn/∆-11    		   +/-8*1,5%    
  10000

14,0

8,0
    16000 10,0
    25000 10,5

 


Three-phase oil-immersed air-blowing power transformers ТДНС type (hereinafter referred to as "transformers") are designed to convert electrical energy for power supply grids, to supply different consumers in AC 50 Hz, including auxiliary power feeding.
Transformers are suitable for indoor and outdoor use and for use in the following conditions:
- altitude up to 1000 m;
- temperate and cold climates: У1, УХЛ1;
- Operating temperature range: from -60°C to +40°C.
Transformers are not suitable for use in the following conditions:
- In the explosive and corrosive environment (containing gases, vapors, dusts and others in abnormal concentration);
- Vibration or shock;
- With frequent reconnections on feeding side.
The transformer provides the ability of voltage adjustment. The adjustment kind is RPN (on-load), i.e. switching transformer to another adjustment point is made operational.
The transformers are equipped with:
- Cooling system with a blow;
- Oil-level indicator, for check the oil level in the tank;
- Oil-level indicator, for check the oil level in the tap changer compartment;
- The transformer temperature sensor;
- The tap changer temperature sensor;
- Buchholz sensor (gas relay) for transformers gas ejection monitoring, for visual check and sampling of oil;
- Gas relay for the tap-changer;
- A device for rolling a transformer in longitudinal and transverse direction.
Transformers consist of an active part mounted under the cover and welded rectangular tank. HV and LV inputs, expander with oil-level indicator are located on the cover.
The active part consists of a magnetic core with windings, the upper and lower yoke beams, the tap changer. The transformers magnetic system is the stick-type, going from cold-rolled electrical steel.
The design of the transformer windings is cylindrical reel, screw-shape, depending of the transformers rated power and voltage.
The HV winding adjustment taps are connected to the fixed contacts of the switch mounted above the active part.

The transformers correspond to ГОСТ 11677 and ГОСТ 11920.