Africa Power Grid

Lagos 132kV Substation Project

Supply of 8 units 132kV power transformers for TCN Lagos substation, supporting grid expansion in Nigeria.

Client Nigerian Federal Ministry of Power
Year 2024
Location Lagos, Nigeria
Scope <p><strong>Project Scope:</strong></p><ul><li>8 × 132/33kV oil-immersed power transformers (40MVA each)</li><li>On-load tap changer (OLTC) for voltage regulation</li><li>Complete commissioning and on-site testing</li><li>Operator training program</li><li>5-year spare parts package</li></ul><p><strong>Duration:</strong> 14 months (design, manufacture, delivery, commissioning)</p>
Lagos 132kV Substation Project

Project Overview

Transformer Co. supplied 8 units of 132kV oil-immersed power transformers for the Lagos 132kV Substation Project in Nigeria, supporting the expansion of the national grid operated by TCN (Transmission Company of Nigeria).The project, completed in 2024, enhanced power transmission capacity in the Lagos metropolitan area, serving over 2 million residents and supporting industrial growth in the Lekki Free Trade Zone.

12 units 120MVA power transformers
132kV / 33kV Voltage ratings
ONAN/ONAF Cooling systems
IEC 60076 International compliance
18 months Delivery timeline

Challenge

Operating in a tropical climate with extreme heat and humidity presented significant engineering challenges. Standard transformer designs would struggle under ambient temperatures regularly exceeding 40°C, requiring specialized insulation systems and robust cooling solutions to maintain reliable performance. Additionally, the logistics of delivering oversized equipment weighing over 120 tons each to sites in Lagos and the landlocked capital Abuja demanded innovative transport planning and modular packaging strategies to navigate Nigeria's road infrastructure.

Our Solution

We engineered custom-designed insulation systems rated for 55°C ambient temperature, exceeding the standard 40°C rating by a significant margin. Enhanced ONAF cooling with additional radiator banks was implemented to ensure optimal thermal management under peak load conditions. For logistics, we developed a modular packaging approach that allowed road transport to remote locations, with components reassembled on-site. Our engineering team provided comprehensive site supervision throughout the 18-month installation period, ensuring every unit was commissioned to exacting standards.

Project Gallery

Technical Specifications

Parameter Specification
Transformer Rating 120MVA
High Voltage 132kV
Low Voltage 33kV
Frequency 50Hz
Cooling ONAN/ONAF
Vector Group YNd11
Tap Changer On-load (OLTC)
Impedance 14%
Ambient Temperature 55°C (design)
Transport Weight ~120 tons

Results & Impact

2M+

Residents with improved electricity access

99.8%

Reliability rate achieved

18 months

On-time delivery

Zero

Major incidents since commissioning

Transformer Co. delivered exceptional quality and on-time performance. Their engineering team worked closely with us to meet TCN specifications. The transformers have been running flawlessly since commissioning. — Project Director, TCN Nigeria

— Chief Engineer, Nigerian Federal Ministry of Power

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