Deltaformer

Raychem RPG is the first in India to manufacture and supply of Deltaformer's "green" transformers with lower losses & weight and give strongly reduced transmission losses. We have in collaboration with Hexaformer, Sweden.

We offer these transformers suitable for city distibution application. The transformers are available in the range upto 400kVA, 11kV.

Comparison

  • Deltaformer
  • Uses wound core without cut
  • No load current is minimum (no air gaps)
  • No load loss is minimum ( ~ 15% less )
  • Core construction results in low noise
  • Compact size results in smaller dimensions
  • Core compactness results in less bulky core frames

  • Hexagonal core limb section is easily approximated in to circular windings
  • Complete core is made using only 2 different widths

  • Core is made on semi / automatic m/c. i.e. Human error can be avoided
  • No removal/fitting of top yoke is involved
  • Windings made on core require no assy
  • Core construction is symmetrical, all limbs have same properties
  • Core construction requires unused core material only to be used
  • Results in low in rush currents
  • Symmetrical Core results in less stray flux and low stray losses
  • Symmetrical core results in lower on nil 3rd harmonic component
  • Deltaformer construction is very robust
  • Deltaformer requires no special material, it uses all the material of conventional dist. Transformer
  • Patented technique to make core , allows the Deltaformer to be a superior product
  • Core heating due to hot spot does not exist
  • Low noise & less vibration results in silent dist. transformer
  • Deltaformer allows Star 5 rating with CRGO material
  • Conventional dist. transformer
  • Uses stacked core
  • No load current is 2~6% of FLC
  • No load loss is substantial
  • Large no of lamination causes more noise
  • Rectangular dimension are more
  • Large no laminations need interleaving and bulky core frames
  • Wound corerequire rectangular windings,

  • 4 ~ 8 different widths are required to fill the core circle ( large inventory )
  • Cutting on m/c, but stacking is manual requires more time.

  • Removal & top yoke fitting takes time
  • Coils fittings on limbs require more time
  • Unsymmetrical construction results in diff. properties for outer limbs and center limb
  • Old core material can be used

  • In rush currents requires adequate safeguards
  • Stray losses are more for outer limbs than center limb

  • Requires delta winding to stop 3rd harmonic progression

  • Stacked core needs special attention to keep it stable
  • Dist. Transformer requires CRGO core , Al/Cu windings , Kraft paper/pressboard ins, mineral oil & MS tank
  • Conventional transformer in comparison are inferior for network stability
  • Uneven gap may create core hot spots
  • Conventional transformers have considerable noise

  • Star 5 rating is possible with amorphous


Segments Supply :

  • Utilities
  • City distribution