A three phase transformer can be constructed either by connecting together three single-phase transformers, thereby forming a so-called three phase transformer bank, or by using one pre-assembled and balanced three phase transformer which consists of three pairs of single phase windings mounted onto one single laminated core.
The advantages of building a single three phase transformer is that for the same kVA rating it will be smaller, cheaper and lighter than three individual single phase transformers connected together because the copper and iron core are used more effectively. In the case of three phase transformer windings, three forms of connection are possible: “star” (wye), “delta” (mesh) and “interconnected-star” (zig-zag).
|High voltage range||6 kv – 500 kv|
|Windings material||Copper or Aluminum|
|Tap changer||OLTC, OCTC or NLTC|
|Rated power range||Up to 720 MVA|
|Cooling method||ONAN / ONAF|
|Rated capacity||25-20000 VA|
|Material||Copper + Aluminum|
|Low off-load losses||Amorphous alloy core type transformer would save 65% off-load losses compared to traditional transformer.|
|Safety||Professional technical technology assure high mechanical strength, short-circuit withstand and long term reliable operation.|
|Reliability||Using C grade insulation level and low partial discharge and long service life.|
|Environment||Energy saving, recyclable,no pollution in the process of transportation, storage and operation.|