Distribution Transformers (11 KV & 33 KV Voltage Class) (Range: 63 KVA TO 5000 KVA)

PRODUCT RANGE

Power & Distribution Transformers 63KVA to 5000KVA in 11 & 33 KV voltage class.

STANDARDS

POWER transfornmers are designed and per tested as IS:2026, BS-171, IEC-76 & IEC-776.

VECTOR GROUP

Transformers will be connected as per vector group reference Dyn11 . Other vector groups can be offered as per specific requirements.

STANDARD FITTING

Transformers will be connected as per vector group reference Dyn11 . Other vector groups can be offered as per specific requirements.

Inner view of Transformer

  1. Monogram plate
  2. Rating and diagram plate
  3. Earthing terminals -2 Nos
  4. Cover Lifting hooks
  5. Lifting lugs
  6. Jacking Lugs(500 KVA & above)
  7. Prismatic glass oil level indicator
  8. Drain-cum bottonm filter valve with plug
  9. Oil filling hole with plug on conservator
  10. Oil conservator with drain plug
  11. Air release plug
  12. Silicagel air breather
  13. Bi-Directional flat rollers
  14. HV terminals-outdoor bushings
  15. LV terminals-outdoor bushings
  16. LV additional neutral-1 No. outdoor bushing without socket (for star connected enclosed LV terminals)
  17. Pressed sheet rediators (tank mounted upto 800KVA and detachable thereafter)
  18. Filter valve with plug
  19. Thermometer pocket
  20. Oil temperature Indicator(stem type)
  21. Externally operated off circuit tap changing switch
  22. Pressure relief valve without electrical contacts
  23. Sampling valve (for 2000 KVA & above Trf. only)

ACCESSORIES (OPTIONAL)

LV and HV cable boxes

Winding temperature indicator

Buchholz relay

Magnetic oil level gauge

Marshalling box

Disconnecting chamber

Oil temperature indicator with electrical contacts

Pressure relief valve with electrical contacts

TERMINAL ARRANGEMENTS

H.V.-Bare Bushings or Cable Box, L.V.-Bare Bushings or Cable Box.

Disconnecting chambers can also be provided on both HV and LV Cable boxes.

TEMPERATURE RISE

POWER transformers are designed for a maximum temperature rise of 50 / 55 degree C of oil / winding. Lower Temperature rise can be offered on request.

Superior Feature of Power Make Distribution Transformer

CORE

The core is constructed from low loss, cold rolled,grain oriented, annealed laminations of electrical sheet steel conforming to the latest international standards.Special frame is built in-house for clamping the core to reduce the magnetic noise as well as making the whole structure rigid and robust.

WINDINGS

Coils are wound with electrolytic high conductivity paper covered or synthetic enameled copper conductors. Cooling ducts are provided to keep the hot spot temperature as low as possible. Coils are dried in electric ovens. Rigid connection support and coil clamping is provided to ensure high short circuit strength.

VECTOR GROUP

Transformers will be connected as per vector group reference Dyn11 . Other vector groups can be offered as per specific requirements.

Inner view of Transformer

INSULATION

Precompressed board PARMALI board and JAPANEESE insulation paper of best quality is used.

TAPPING

A. OFF CIRCUIT TAP CHANGING SWITCH

B. ON LOAD TAP CHANGER

Tappings from + 5% to – 5% in steps of 2.5% for HV variation or as per customer’s requirement.

Tapping range as per specific requirements can be offered.

OLTC for remote / auto / parallel operation can also be offered.

OIL

Oil is tested for resistivity, dielectric and acidic characteristic conforming to IEC – 296 / IS – 335. Before topping up, oil is filtered throughly.

TANKS

The tanks are made of M.S. Steel plates / sheets with adequate bracing & stiffners. Tanks are pressure tested to withstand any type of inside or outside pressure. All the external surfaces are given a primary coat of zinc chromate, red oxide and two finishing coats of grey paint. The inner surfaces are given a coat of heat and oil resisting paint.

TERMINAL ARRANGEMENTS & BUSHING

Following arrangements are provided: (a) H.V.- Bare or Cable box bushings. (b) L.V.-Bare or cable box bushings, disconnecting chambers can also be provided on both HV & LV cable boxes. Bushing conforms to IS:3347,2099, HV/LV bushing terminals of brass / copper conformers to IS:3347 Section-II metal part.

GASKET & JOINTS

All gaskets used for making oil tight joints to be with cork as base banded by oil resisting synthetic material or rubber, Neoprene rubber is used for oil tight joints for HV & LV terminals. The gaskets conforms to IS:4253, Part- II – 1980(Reaffirmed 1999), NC777, RC 70C.

QUALITY CONTROL & ROUTING TESTS

All POWER transformers undergo rigorous quality control checks and are routine tested as per IS in our fully equipped laboratory. Any specific test required by the customer can also be arranged.

WE AlSO MANUFACTURE SALT BATH FURANCE TRANSFORMER

Customized Distribution Transformer

Inner view of Transformer

1000 KVA, Outdoor Type Distribution Transformers, 11KV Class with OTI, WTI, Buchholz Relay & Marshalling Box