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Distribution Transformers

DISTRIBUTION AND POWER TRANSFORMERS

These Transformers are the popular and commonly produced type of Transformers. They range from small pole mounted transformers to very large transformers seen openly in distribution yards and substations. Typically robust oil-natural, air natural (ONAN) cooling is used due to the remoteness of the installation site and added complexity of other cooling options.
 

LARGE DISTRIBUTION TRANSFORMERS :

RANGE
: 5000kVA to 20 000kVA

PRIMARY VOLTAGES: up to 33kV

TAPPINGS: Off-circuit Tap switch (OCTS) or on-load Tap Changers (OLTS)

TAPPING RANGE 2,5% to 5% (OCTS) or 5% to 15% (OLTS)

TERMINATION: HV & LV Outdoor open bushings or : HV & LV cable boxes

TANK CONSTRUCTION: Free breathing with bolted on lids, flat under base or Skid base

COOLING: ONAN/ONAF

FITTINGS: Lifting lugs, earth terminal, surge arrestor brackets when requested, rating & diagram plate, drain & filter valve, Jacking pads, Oil level indicator, Oil temperature indicator, winding temperature indicator, dehydrating breather.

STANDARDS: SABS, SANS 780


SMALL and MEDIUM TRANSFORMERS :


RANGE: 5kVA – 5000kVA

PRIMARY VOLTAGES: up to 33kV

TAPPINGS: External Tapping connection (single phase) or of circuit Tap-switch (OCTS)

TERMINATIONS: HV Outdoor open bushings or HV & LV cable boxes

TANK CONSTRUCTION:
Sealed welded cover or sealed bolted cover.

COOLING: ONAN

MOUNTING ARRANGEMENT: Pole mounting with brackets or flat base for pole mounting platform mounting

STANDARDS: SABS, SANS 780


 



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