Project Overview

The 11720775 Zhonghe Tianwan 4250 project supports coastal and tidal-flat photovoltaic generation, associated energy storage facilities, and a 220kV substation development in China. For the 35kV transformer application, TengQi Technology supplied corrosion-protected panel radiators configured for long-term outdoor exposure in a high-salinity marine atmospheric environment.

The project required a radiator solution capable of addressing persistent humidity, salt spray, chloride ion exposure, condensation, and the practical maintenance constraints common to coastal and tidal-flat power infrastructure. Jiangsu Tengqi Electric Power Technology Co., Ltd. provided panel radiators with a C5-H anti-corrosion configuration based on hot-dip galvanizing and composite coating protection.

Project Configuration

Coastal Operating Conditions and Project Requirements

Coastal photovoltaic and energy storage projects place specific demands on transformer auxiliary components. In marine and tidal-flat locations, metal structures may be exposed to salt-laden air, elevated moisture, temperature variation, condensation, and chloride ions over extended periods. These factors can increase the risk of coating degradation and corrosion at exposed surfaces, welds, edges, and other vulnerable areas.

For this project, the radiator system needed to support the outdoor operating requirements of transformers installed in feeder areas and substation-related applications. In addition to corrosion protection, the supply needed to align with transformer manufacturing, substation construction, and project delivery schedules.

• Anti-corrosion protection suitable for high-salt-spray and strongly corrosive coastal conditions.
• Enhanced protection for metal substrates, weld areas, edges, and external radiator surfaces.
• Batch supply support for 35kV transformer radiator matching requirements.
• Coordination with the technical documentation and delivery rhythm of the renewable energy project.
• Consideration of inspection, repair, and replacement challenges associated with coastal and tidal-flat operating environments.

C5-H Composite Anti-Corrosion Solution

TengQi Technology configured the 35kV transformer panel radiators with a combined hot-dip galvanizing and high-build composite coating system. The design approach combines metallic protection with an external coating barrier, supporting the environmental adaptability required for this coastal application.

Hot-dip galvanizing provides a foundational protective layer on the metal substrate. Where an external coating may be locally damaged, the zinc layer can provide a degree of sacrificial protection. The composite coating layer adds an external barrier designed to reduce the penetration risk of moisture, salt spray, and chloride ions toward the substrate.

The specified 60 μm galvanized layer and 200 μm RAL7035 coating layer form a total 260 μm protection structure configured to meet the project’s C5-H corrosion category requirement. The protection system was selected for this project’s specific environmental and technical conditions and should be independently confirmed for other locations, equipment designs, salt-spray levels, and customer specifications.

Manufacturing and Delivery Coordination

As a professional transformer radiator manufacturer and transformer cooling solution provider, TengQi Technology integrated the project’s anti-corrosion requirements into the radiator manufacturing and supply process. The work covered product configuration, batch manufacturing, surface treatment, coating control, quality management, and delivery coordination for the required panel radiators.

Panel radiators are an important component of the thermal management system for oil-immersed transformers. Their configuration must be coordinated with the transformer body, installation arrangement, and the broader construction plan of the substation. For the Zhonghe Tianwan 4250 project, the PC1300(900)-20(3)/520 radiators were supplied as matching components for the project’s 35kV transformers.

Specific inspection items, acceptance criteria, and delivery conditions were implemented in accordance with the project-approved technical agreement and order documentation. TengQi Technology’s manufacturing and quality capabilities supported the batch supply requirements while maintaining alignment with the confirmed project specifications.

Application Value

The C5-H composite protection configuration provides targeted corrosion-control support for transformer radiator applications in humid, salt-spray-prone coastal environments. By combining galvanizing protection and a high-build coating barrier, the solution helps address corrosion exposure on radiator surfaces and structural details in outdoor renewable energy infrastructure.

For coastal photovoltaic, energy storage, and substation projects, this type of radiator configuration can help reduce corrosion-related inspection, repair, and replacement pressure where site access and maintenance organization may be more demanding. The supplied radiators support the thermal management component requirements of the 35kV transformer installation; overall transformer, storage, voltage regulation, and grid-connection performance remain dependent on their respective equipment and system designs.

Project feedback indicated that installation coordination was convenient and that the radiators operated steadily under the project conditions, meeting the established matching requirements. The product model, coating structure, film thickness, and corrosion category described on this page apply specifically to the 11720775 Zhonghe Tianwan 4250 project.