LE partners with hanoi’s grid-scale bess project

As the power industry continues its transition toward renewable energy and smart grids, Battery Energy Storage Systems (BESS) are playing an increasingly important role in enhancing the stability, safety, and operational efficiency of modern power networks.

Supporting this transformation, Hanoi Electrical Equipment Manufacturing Joint Stock Company - LE Transformer is proud to have designed, manufactured, and supplied eight 5,000kVA 22/0.69kV oil-immersed transformers for four BESS substations within Hanoi's grid-scale Battery Energy Storage System project.

This milestone highlights LE's engineering expertise and manufacturing capabilities in delivering high-performance transformers for advanced energy infrastructure projects with demanding technical requirements.

LE Supports the Hanoi BESS Project

BESS - An Essential Energy Storage Solution for Modern Power Grids

The rapid expansion of solar, wind, and other renewable energy sources has created an increasing demand for efficient energy storage solutions. Battery Energy Storage Systems (BESS) provide an effective way to:

• Store excess electricity generated from renewable energy sources.
• Balance power generation and electricity demand.
• Reduce peak load on the power grid.
• Stabilize grid voltage and frequency.
• Improve the reliability and flexibility of the electrical network.

As a result, BESS projects are being deployed across Vietnam to accelerate the country's energy transition and support the development of a smarter and more resilient power grid.

LE Transformers - A Critical Component of Every BESS

Many people assume that a Battery Energy Storage System consists only of battery modules. In reality, transformers are indispensable components that ensure the entire system operates safely and efficiently.

For this project, LE supplied eight 5,000kVA 22/0.69kV oil-immersed transformers, performing several critical functions:

• Connecting the battery energy storage system to the 22kV medium-voltage grid.
• Stepping down the voltage from 22kV to 690V to supply the Power Conversion System (PCS).
• Transmitting high electrical loads with excellent efficiency.
• Ensuring stable operation during continuous charging and discharging cycles.
• Meeting stringent requirements for power losses, temperature rise, insulation performance, and long-term operational reliability.

In essence, the transformer serves as the vital link between the battery storage system and the national power grid, enabling safe, stable, and efficient power transmission.

LE's 5,000kVA Transformers Engineered Specifically for Energy Storage Systems

Unlike conventional distribution transformers, transformers used in BESS applications must withstand highly dynamic operating conditions, with continuously changing power levels during charging and discharging cycles.

To meet these challenges, LE has developed a specialized 5,000kVA transformer featuring:

• Optimized design for continuous-duty operation.
• High overload capability with stable performance.
• High operating efficiency with minimized energy losses.
• Superior insulation strength and durability.
• Compatibility with high-capacity PCS and inverter systems.
• Long service life and reliable operation under demanding working conditions.

Every transformer is manufactured under a rigorous quality management system and fully tested to ensure compliance with technical specifications before delivery and commissioning.

Rigorous Manufacturing Process Ensuring Superior Quality

Every LE transformer undergoes a comprehensive manufacturing and quality control process, including:

• Engineering design.
• Core fabrication.
• High-voltage and low-voltage winding.
• Transformer assembly.
• Vacuum drying.
• Insulating oil filling.
• High-voltage testing.
• No-load and load loss measurement.
• Temperature rise testing.
• Final inspection and factory acceptance testing before shipment.

Strict quality control at every stage ensures that each transformer fully satisfies technical requirements while providing outstanding safety, reliability, and performance for large-scale power projects.

Demonstrating Capability Through Modern Energy Projects

Being selected as the transformer supplier for Hanoi's BESS project reflects not only the strong reputation of the LE brand but also its proven expertise in designing, manufacturing, and delivering large-capacity transformers for technically demanding energy applications.

Actual production and installation images from the factory and project site clearly demonstrate LE's manufacturing capacity, quality assurance system, and extensive experience in executing modern energy projects.

Supporting Vietnam's Energy Transition

As Vietnam continues implementing its national energy development strategy, Battery Energy Storage Systems will become increasingly important for:

• Integrating renewable energy into the power grid.
• Balancing electrical loads.
• Stabilizing grid voltage and frequency.
• Improving power supply reliability.
• Building a modern smart grid.
• With many years of experience in transformer manufacturing, LE continues to invest in advanced technologies, optimize production processes, and develop specialized transformer solutions for:
• Battery Energy Storage Systems (BESS)
• Solar power plants
• Wind power plants
• Data centers
• Industrial manufacturing facilities
• 22kV, 35kV, and 110kV substations

LE - Your Trusted Partner for BESS and Energy Projects in Vietnam

Backed by advanced engineering expertise, state-of-the-art manufacturing capabilities, and stringent quality control standards, LE Transformer is committed to delivering high-performance transformers that operate reliably while meeting the demanding technical requirements of today's modern energy projects.

LE's participation in Hanoi's Battery Energy Storage System project is another testament to the company's capability to support Vietnam's energy transition and contribute to the development of a safer, smarter, and more sustainable power infrastructure.