A 132/33kV oil-immersed power transformer installation housed in an outdoor substation yard, surrounded by a secure fenced enclosure for safety and operational reliability.

Overview:

Power transformers are the heart of any electrical substation, used for voltage step-down or step-up between transmission and distribution networks. This particular unit is installed to step down high-voltage electricity (132kV) to medium voltage (33kV) for downstream distribution.

Key Specifications:

• Rated Voltage:
  Primary side: 132kV
  Secondary side: 33kV
  (Exact voltage rating can vary per project; could also be 66/11kV or 132/11kV depending on scope.)

• Power Rating:
  Ranges from 10 MVA to 100 MVA typically (confirm based on specs used for this job).

• Cooling Type:
  ONAF (Oil Natural Air Forced) or ONAN (Oil Natural Air Natural) cooling system with visible radiators and forced cooling fans.

• Insulation Medium:
  High-grade insulating oil is used for dielectric strength and heat dissipation.

• Accessories and Components:

  • Conservator tank with silica gel breather for oil expansion.

  • Buchholz relay for gas detection and protection.

  • Oil temperature indicators, winding temperature indicators, and pressure relief devices.

  • High-voltage bushings for primary and secondary terminations.

  • Off-load or on-load tap changers (OLTC) for voltage regulation.

Installation Highlights:

• Installed within a dedicated transformer bay with metallic fencing for physical protection and to comply with safety codes.

• Transformer mounted on a grated plinth for oil drainage and thermal dissipation.

• Includes earth pits, cable trenches, and control cable routing to local control panels or remote SCADA integration.

Purpose of Installation:

This transformer plays a critical role in delivering reliable power to the client’s facility, ensuring stable voltage transformation for industrial or utility-scale power needs. It is designed for 24/7 operation with robust protection systems and remote monitoring provisions to minimize downtime.