Power Sector

TRANSFORMERS

Authorized Distributor by ATStrafo
TRANSFORMERS WITH AN EXPANSION TANK

A transformer with an oil expansion tank is exposed to atmosphere and provides exchange of air through an air dryer (silica gel) container that prevents the moisture in air from passing into the transformer oil. The size of an expansion tank varies in proportion to the transformer power and size.

HERMETIC TRANSFORMERS

Differently than with transformers with an oil expansion tank, hermetic transformers are completely sealed from the atmosphere (exterior milieu). In a hermetic transformer, the tank inside pressure building up due to oil expansion is counteracted by a flexible corrugated sheet metal sized as a result of calculations. In hermetic transformers, oil is filled at +20°C and sealed from atmosphere.

SPECIAL TRANSFORMERS

Special transformers are manufactured for special areas of use in line with the client’s requirements and requests except standard powers and voltages. Examples include grounding transformers, autotransformers, etc.

ON LOAD TAP-CHANGER TRANSFORMERS

They are transformers capable of tap-changing under voltage and load, and power transformers are manufactured with this capability. With a system controlled by voltage regulators, the output voltage can be controlled manually or automatically to the required accuracy.

CABLE-BOX TRANSFORMERS

Depending on the client’s requests and specifications, transformers can be equipped with a cable box that provides protection against probable touches on areas under voltage (LV and HV terminals). Cable boxes can be designed so as to cover LV terminal or HV terminal or both LV and HV terminals.

PLUG-IN BUSHING TRANSFORMERS

At the HV side of transformers, generally plug-in bushings manufactured from epoxy resin are used with a matched cable cap, instead of exposed porcelain insulators. Plug-in bushings are rather used for indoor transformers.

Production Line

 500 – 5000 kVA TRANSFORMERS

  1. Oil Filling Plug
  2. Conservator Oil Drain Nippel
  3. Magnetic Oil Level Indicator
  4. Earthing Terminals
  5. H. V. Bushings
  6. L. V. Bushings
  7. Wheels
  8. Rating Plate
  9. Oil Drain Valve
  10. Lifting Lugs
  11. Off – Load Tap Changer
  12. Thermometer With Contact
  13. Dehydrating Breather
  14. Connection Box

 500 – 2500 kVA TRANSFORMERS

  1. Oil Filling Pipe
  2. Pressure Safety Valve
  3. Hermetic Protection Relay
  4. Earthing Terminals
  5. H. V. Bushings
  6. L. V. Bushings
  7. Wheels
  8. Rating Plate
  9. Oil Drain Valve
  10. Lifting Lugs
  11. Off – Load Tap Changer
  12. Lifting Jack Part
  13. Arcing Horns
  14. Terminal Box

 25 – 200 kVA TRANSFORMERS

  1. Oil Filling Pipe
  2. Pressure Safety Valve
  3. Hermetic Protection Relay
  4. Earthing Terminals
  5. H. V. Bushings
  6. L. V. Bushings
  7. Wheels
  8. Rating Plate
  9. Oil Drain Valve
  10. Lifting Lugs
  11. Off – Load Tap Changer
  12. Lifting Jack Part
  13. Arcing Horns
  14. Terminal Box

 25 – 400 kVA TRANSFORMERS

  1. Oil Filling Pipe
  2. Pressure Safety Valve
  3. Oil Level Indicator
  4. Earthing Terminals
  5. H. V. Bushings
  6. L. V. Bushings
  7. Wheels
  8. Rating Plate
  9. Oil Drain Valve
  10. Lifting Lugs
  11. Off – Load Lap Changer
  12. Thermometer Pocket

 250 – 400 kVA TRANSFORMERS

  1. Oil Filling Plug
  2. Conservator Oil Drain Nippel
  3. Magnetic Oil Level Indicator
  4. Earthing Terminals
  5. H. V. Bushings
  6. L. V. Bushings
  7. Wheels
  8. Rating Plate
  9. NW 22 Oil Drain Valve
  10. Lifting Lugs
  11. Off – Load Tap Changer
  12. Thermometer
  13. Dehydrating Breather
  14. Pressure Relief Valve
 TRANSFORMER ACCESSORIES
PRESSURE RELIEF VALVE

A pressure relief valve protects the transformer tank by ensuring the evacuation of sudden pressure rise building up in hermetic transformers in cases of failure.

HERMETIC PROTECTION RELAY

A hermetic protection relay is a multifunctional protective device that provides protection against temperature rise, pressure rise, low oil level and gas accumulation in hermetic transformers. A relay has two contacts, warning and tripping, against each failure condition.

BUCHHOLZ RELAY

Buchholz relays are used in transformers with an oil expansion tank. It provides protection by giving contact in cases of electrical failures occurring in the transformer or caused by insulating materials. It has two contacts, warning and tripping, for cases of failure.

DEHYDRATING BREATHER

In transformers with an oil expansion tank, an dehydrating breather mounted on the expansion tank prevents the moisture from penetrating oil by cutting off the direct interaction of oil with the exterior milieu by means of a silica gel put in it. The quantity of silicagel varies depending on the transformer power.

WITH CONTACT THERMOMETER

A contact thermometer has two contacts that are settable according to the permissible oil temperature rise in the transformer. It is possible to monitor oil temperature in the range of 0 to 120°C on the thermometer.

OIL LEVEL INDICATOR

In transformers with an oil expansion tank, an dehydrating breather mounted on the expansion tank prevents the moisture from penetrating oil by cutting off the direct interaction of oil with the exterior milieu by means of a silica gel put in it. The quantity of silicagel varies depending on the transformer power.

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