22KV 50~2500KVA OIL-IMMERSED DISTRIBUTION TRANSFORMER

Windings & Cooling

• Conductor Material: Electrolytic copper or aluminum

• Insulation Class: A (105°C) / B (130°C)

• Cooling Design:

• Oil circulation channels for optimal cooling

• Corrugated tank walls (≤3,150 kVA)

• Bolt-on radiators (>3,150 kVA, cold-rolled steel)

Tank Protection

• Corrosion-Resistant Coating:

• RAL 7031 / RAL 7033 paint (min. 120μm thickness)

• C3 to C5-H protection class (suitable for harsh environments)

• Optional Conservator Tank (for oil expansion)

Transformer Tank

• Two Variants:

1. Corrugated (Finned) Tank (standard for ≤3,150 kVA)

2. Radiator-Equipped Tank (for higher capacities)

• Internal Protection:

• Hot oil-resistant paint (pre-sandblasted)

• Pressure & Leakage Tested

Transformer Windings

• HV Winding:

• Helical (multi-layer) or disc-type (based on voltage & power)

• Wire or strip conductor

• LV Winding:

• Foil/strip construction with terminal bars for mechanical strength

• Insulation:

• Pure cellulose paper (inter-layer)

• Compressed cardboard cylinders (HV-LV isolation)

Transformer Core

• Material: Cold-rolled grain-oriented (CRGO) silicon steel

• Step-Lap Jointing → Minimizes losses & noise

• Zinc-reinforced clamping → Ensures stability during transport & operation

Bushings

• HV & LV Bushings:

• Oil-filled, brown porcelain (IEC-compliant)

• Plug-in type available (optional)

• Arcing horns (optional for MV bushings)