Dominican Republic 110 kV Grid Project – 40 MVA & 50 MVA Power Transformers
09-12 2026 | By:
Project Overview
ZTELEC YUGUANG supplied three 110 kV power transformers for a national power grid project in the Dominican Republic.
The project included one 40 MVA transformer and two 50 MVA transformers, manufactured according to IEC 60076 requirements. The transformers were customized for the project’s coastal installation environment, site construction conditions and long-term grid operation.
| Item | Specification |
|---|---|
| Project Location | Dominican Republic |
| Application | National Power Grid |
| Equipment | Oil-Immersed Power Transformers |
| Quantity | 3 Sets |
| Transformer Capacity | 1 × 40 MVA + 2 × 50 MVA |
| Voltage Class | 110 kV |
| Standard | IEC 60076 |
| Lead Time | 4 Months |
| Installation Environment | Coastal Area |
| Coating Protection | C5 |
| Bushing | Customized Hitachi Bushings |
Customized 40 MVA and 50 MVA 110 kV Power Transformers
The project required different transformer capacities within the same grid application. ZTELEC YUGUANG manufactured:
- 1 × 40 MVA, 110 kV power transformer
- 2 × 50 MVA, 110 kV power transformers
The transformer design was developed according to the project’s electrical requirements and site conditions, with a focus on reliable operation within a national transmission and distribution network.
All units were manufactured according to IEC 60076, covering the applicable requirements for power transformers.
Customized Hitachi Bushings for 110 kV Transformers
For the main transformers, customized Hitachi bushings were selected according to the project’s technical requirements.
The bushing configuration was coordinated with the transformer design to ensure proper electrical insulation, connection and installation at the 110 kV voltage level.
In addition to the bushings, the bushing and surge arrester layout was customized according to the actual site conditions.
This helped accommodate:
- Available installation space
- Cable and conductor connection requirements
- On-site construction conditions
- Transformer maintenance access
- Surge protection requirements
- Actual operating scenarios
C5 Coating for Coastal Installation
The project is located in a coastal environment, where high humidity, salt spray and atmospheric corrosion can significantly affect outdoor electrical equipment.
To address this condition, C5-class corrosion protection was applied to the transformer tanks and radiators.
The customized coating system provides enhanced protection for the external steel components and is particularly suitable for demanding outdoor environments with elevated corrosion exposure.
For large power transformers installed in coastal substations, appropriate surface preparation and coating protection are important for maintaining the mechanical condition and service life of the transformer enclosure and cooling components.
4-Month Manufacturing and Delivery
The three transformers were manufactured with a 4-month lead time.
Because 110 kV power transformers are highly customized electrical equipment, the manufacturing process requires coordination between transformer design, electrical components, bushings, cooling systems, tank fabrication, coating and routine testing.
The project was therefore organized around the customer’s technical specifications and site requirements to ensure that the final transformer configuration was suitable for field installation.
Solution for National Grid Applications
This project demonstrates ZTELEC YUGUANG’s capability to supply medium- and high-capacity 110 kV power transformers for utility and national grid applications.
The combination of:
- 40 MVA and 50 MVA transformer capacities
- 110 kV voltage class
- IEC 60076 compliance
- Customized Hitachi bushings
- Customized bushing and surge arrester arrangement
- C5 corrosion protection
- Coastal-environment adaptation
provided a transformer solution tailored to the project’s electrical and environmental requirements.
Why Choose ZTELEC YUGUANG for 110 kV Power Transformers?
For utility and grid projects, transformer selection involves more than rated capacity and voltage. Environmental conditions, component configuration, installation space and long-term operating requirements must also be considered.
ZTELEC YUGUANG provides customized power transformer solutions for utility, industrial and renewable energy projects, with transformer designs developed according to project-specific technical specifications and applicable international standards.
Project Highlights
3 Sets | 40/50 MVA | 110 kV | IEC 60076 | C5 Coating | 4-Month Lead Time
This project demonstrates the ability to customize 110 kV power transformers for demanding coastal grid applications while integrating customer-specified components and site-specific installation requirements.
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