Project Selection of the PC1400-29/520 Radiator and Compatibility with ONAN/ONAF Cooling Methods
TengQi Technology's (TQT) PC1400-29/520 is a detachable finned heat sink designed for use with high-voltage oil-immersed power transformers. It features a 1400 mm center-to-center spacing, 29 fins, and a 520 mm fin width , providing a self-cooling area of 21.72 m² . This product can be included in the initial selection process for ONAN natural cooling or ONAF air cooling systems; however, the final cooling method, configuration quantity, and actual compatibility should still be verified and technically confirmed based on the overall thermal conditions of the transformer.
From radiator specifications to system compatibility: What should be considered when selecting a radiator?
The PC1400-29/520 specification can be used for product identification, project communication, and preliminary layout assessment. However, the area, voltage level, or number of sections of a single radiator cannot be used to deduce the transformer capacity matching relationship or actual cooling capacity. For oil-immersed transformers, the radiator needs to form a complete cooling system together with the oil circulation path, heat source losses, installation layout, and external environment.
Therefore, when determining whether the PC1400-29/520 is suitable for a particular project, it is recommended to start with the transformer's thermal requirements and then confirm the number of heat sinks, interfaces, and cooling methods. Tengchi Technology can provide technical support regarding structural compatibility and manufacturing requirements in conjunction with project documentation.
PC1400-29/520 Main Technical Parameters
| parameter | Specification |
|---|---|
| Product Model | PC1400-29/520 |
| Structural form | Detachable plate heat sink |
| center distance | 1400 mm |
| Number of heat sinks / width | 29 pieces / 520 mm |
| Material/Thickness | SPCC / 1.0 mm |
| Product weight | 389 kg |
| Self-cooling heat dissipation area | 21.72 ㎡ |
| Oil filling quality | 118.1 kg |
| Coating process / Total film thickness | Paint application / 200 μm |
| Minimum order quantity | 1 × 40HQ |
Note: The above are preliminary product selection and identification parameters. Interface dimensions, connection methods, manufacturing tolerances, inspection items, and delivery requirements shall be based on the technical drawings, order documents, or technical agreements confirmed by both parties.
ONAN and ONAF: Adaptation Logic for Two Cooling Methods
ONAN Natural oil circulation and natural air cooling
ONAN relies on the natural circulation of transformer oil under the influence of temperature difference and releases heat through natural convection between the radiator surface and the ambient air. This system has a relatively simple structure, but whether it meets operational requirements depends on transformer losses, allowable temperature rise, the number of radiators, and the site environment.
Key points for compatibility assessment: Under design load and ambient temperature, thermal calculations confirm that the natural circulation oil flow and natural air convection can meet the temperature rise requirements.
ONAF Natural Oil Circulation Forced Air Cooling
ONAF maintains natural circulation on the oil side and enhances heat exchange by increasing the airflow velocity over the radiator surface using fans. This solution is typically used for systems requiring increased thermal margin or handling high load conditions, but the number of fans, their installation location, control logic, and start-stop strategy should all be incorporated into the overall cooling design.
Key points for compatibility assessment: In addition to thermal calculations, the fan configuration, power supply and control conditions, duct space, maintenance accessibility, and operation strategy should also be checked.
The self-cooling heat dissipation area of 21.72 m² is a structural parameter of the PC1400-29/520 and does not equate to the actual heat dissipation under specific environments, oil flow rates, and air-cooling configurations. The choice between ONAN and ONAF should be determined based on the thermal performance verification results of the complete cooling system.
Key inputs for preliminary project selection
To improve technical communication efficiency, it is recommended to prepare the following information during the PC1400-29/520 heatsink selection phase. This data is used to determine the compatibility between the heatsink's structure, quantity, connection method, and cooling strategy.
Applicable projects and structural matching considerations
The PC1400-29/520 can be used for the cooling system of 35 kV to 110 kV oil-immersed power transformers . It is commonly used in new outdoor substations, power grid reconstruction, expansion and equipment renovation projects. After the capacity, loss, temperature rise and overall cooling design are verified, it can also be matched with some 132 kV outdoor main transformer projects.
- The detachable structure facilitates the separate manufacturing, transportation, and on-site assembly of the radiator and transformer body.
- A 200 μm total film thickness spray coating provides basic surface protection for outdoor applications.
- For industrial pollution, large diurnal temperature range, severe cold or other complex environments, the coating system, substrate and sealing scheme should be determined in conjunction with the project's corrosion level, minimum design temperature and specification requirements.
- The current product material is SPCC with a thickness of 1.0 mm. If the project proposes low-temperature materials or special verification requirements, these should be specified separately during the technical confirmation stage. Specific low-temperature performance should not be inferred from these product parameters.
Return the radiator configuration to system check.
For the PC1400-29/520, a reliable project assessment is not just about comparing heat dissipation area or voltage level, but about establishing a complete selection basis based on transformer losses, temperature rise, oil flow, ambient temperature, number of heat sinks, and interface layout.
Tengchi Technology can collaborate on projects encompassing technical consulting, product selection, R&D design, sample development, mass manufacturing, quality verification, global delivery, and after-sales technical support. It is recommended to provide transformer parameters, cooling requirements, and interface information during the project initiation phase to facilitate structural and thermal compatibility verification.
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