We erected a 132/33kV Power Transformer manufactured by Hyundai Heavy Industries Co., Ltd., installed as a core component of a high-voltage electrical substation for power transmission and distribution.

Key Specifications:

• Voltage Rating:
  Primary side: 132kV
  Secondary side: 33kV
  This allows for efficient voltage step-down from transmission to distribution level.

• Transformer Type:
  Oil-immersed, ONAN/ONAF-cooled Power Transformer equipped with radiators and cooling fans for heat dissipation under varying load conditions.

• Manufacturer:
  Hyundai Heavy Industries, a globally recognized manufacturer of high-capacity electrical equipment.

• Cooling System:
  Combination of radiator banks with forced air cooling fans visible on both sides for optimal heat management. The transformer may switch from natural cooling (ONAN) to forced cooling (ONAF) as load increases.

• Attached OLTC (On Load Tap Changer):
  Ensures automatic voltage regulation and stability by adjusting winding taps under load.

• Bushings & Connections:
  High-voltage and medium-voltage bushings connected to respective switchgear and overhead gas-insulated bus ducts (GIB).

• Fire Protection & Safety Systems:
  Clearly visible fire suppression piping network (red pipework), installed per NFPA/IEC 60076-11 fire safety standards for oil-filled transformers.

• Auxiliary Equipment:
  Includes:

  • Conservator tank with oil level indicators

  • Buchholz relay for fault detection

  • Oil temperature gauge and winding temperature indicators

  • Pressure relief device

  • Breather system for moisture control

Purpose & Role in the Substation:

This transformer is a critical interface between the high-voltage transmission grid (132kV) and the medium-voltage distribution network (33kV). It supports:

• Load transfer to distribution feeders

• Voltage regulation

• System protection and isolation
  Ideal for urban substations, industrial zones, or utility-level interconnection points.