110kV Three-phase power transformers ТМН type

  The transformers are suitable for indoor or outdoor installation for operation 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 medium (containing gases, vapors, dusts and others an increased concentration.);
- Vibration or shock;
- at often hooking-up of the supply (HV) side.
The transformer provides voltage regulation.

The regulation type - РПН (tap changer), i.e. on-load reconnection the transformer to an another voltage adjustment step.
The transformers are equipped with:

- Oil-level indicator, oil level in the tank;
- Level indicators, to monitor oil level in the tap-changer compartment;
- Transformer temperature sensor;
- Tap-changer temperature sensor;
- Buchholz sensor (gas relay) of the transformer, for visual control of the released gas, as well as for oil sampling;
- Gas relay for the tap-changer;
- A device for rolling a transformer in longitudinal and transverse directions.
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 are compliant to ГОСТ 11677, ГОСТ 11920.