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Sieyuan delivered a 375 MVA, 400 kV transformer bank for a substation serving Mexico's main coal-producing region in Coahuila.
400 kV Power Transformer Project — Mexico
To address the project's urgent timeline, demanding operating environment, and complex technical requirements, Sieyuan delivered an integrated solution spanning design, manufacturing, logistics, and asset protection. By drawing on Sieyuan's global technical resources, optimizing the end-to-end R&D and manufacturing workflow, and applying parallel project management, the team achieved rapid delivery without sacrificing quality. From contract signing to on-site delivery, the entire process was completed in just nine months. The solution also incorporated a specialized impedance matching design, fully satisfying the project's compatibility, safety, and schedule requirements.
Project Overview
Sieyuan delivered a 375 MVA, 400 kV transformer bank for a substation serving Mexico's main coal-producing region in Coahuila.
Project Background
Regional load growth outgrowing the existing transformer at a key substation.
Key Challenges
A compressed schedule with exact impedance matching to the existing bank.
Sieyuan Solution
Parallel design and manufacturing with proactive logistics, delivered in nine months.
Project Overview
Project Background
Coahuila is Mexico's primary coal-producing region, and the substation at the center of this project serves as its main power source. As regional demand grew, the existing transformer could no longer meet peak load requirements — threatening operational continuity across the local coal industry. A capacity upgrade was urgently needed. The solution was a 375 MVA, 400/230 kV transformer bank comprising three 125 MVA single-phase auto-transformers, engineered for full compatibility with the existing network. The expanded installation would reinforce transmission capacity, improve load support, and eliminate the risk of grid overload or collapse during peak demand.
Key Challenges
- Accelerated Schedule — The capacity shortfall posed an immediate risk to regional production, making it essential to compress the full project cycle — from design through commissioning — without compromising quality or safety.
- Impedance Compatibility — The new transformer bank was required to match the impedance parameters of the original equipment precisely. Any deviation risked introducing faults into the broader transmission network, making exact electromagnetic compatibility a non-negotiable design requirement.
- Logistics Complexity — The transformer's design configuration resulted in an overall transport height that exceeded standard clearance limits. This demanded early, detailed route planning and close coordination throughout the delivery process to ensure the equipment arrived safely and on schedule.
Sieyuan Solution
- 9-Month Delivery — Sieyuan compressed the project timeline through parallel design and manufacturing scheduling, supported by proactive logistics coordination. The transformer bank was delivered to site nine months after contract execution — meeting the client's urgent operational timeline.
- Precise Impedance Matching — The engineering team employed electromagnetic simulation and winding structure optimization to achieve exact impedance alignment with the existing equipment. This ensured seamless system integration and stable grid performance from the moment the new bank was energized.
- Integrated Logistics Management — Logistics planning commenced in parallel with the design phase. Comprehensive route surveys were conducted early, allowing transport constraints to be incorporated directly into the equipment design. Dedicated service engineers accompanied the shipment throughout, resulting in zero-damage delivery to site.
