Flat radiators are widely used both domestically and internationally as essential cooling components for oil-immersed transformers. Our transformer heat sinks are made from premium cold-rolled steel strips, precisely formed into fully corrugated panels that are spot-welded and seam-welded into a single durable structure. Each panel is securely connected to the header using advanced CO2 gas-shielded welding, effectively eliminating internal weld defects such as slag and iron filings that could compromise transformer quality.
All products undergo rigorous sealing tests, surface treatments, and hot oil flushing to ensure long-term reliability and leak-free performance. Every technical parameter fully complies with the JB/T5347-1999 industry standard for laminated transformer radiators.
Scope of Application
These transformer heat sinks are designed for cooling large and medium-sized power transformers, reactors, and similar electrical equipment. They can be directly connected to the transformer tank flange or mounted independently on brackets near the transformer. All designs conform to the JB15347-2013 standard.
Technical Specifications
Radiator Width: 310mm, 480mm, 520mm, 535mm
Center Distance: 500–4200mm
Type: PC / PG
Material: Cold-rolled steel or cold-rolled steel plate
Fin Thickness: Customizable
Pitch: 40mm, 45mm, 50mm (custom options available)
Color: Standard gray or customized colors
Cooling Methods
a. Self-Cooling: Heat is dissipated naturally through convection.
b. Air-Cooling: Fans are installed at the bottom or side to enhance cooling efficiency.
c. Forced Oil-Air Cooling: Cooling oil circulates through a pump while fans expel heat from the radiator.
Marking, Packaging, and Storage
Each product is delivered with a quality certificate and conformity report indicating the model, specifications, inspection details, and production date. Radiators are securely packed in wooden crates to ensure safe transportation, with both headers capped using protective plastic covers.
For storage, radiators should be kept in a dry, well-ventilated area, protected from rain, corrosion, and mildew. Do not remove the header caps before installation. For PC-type radiators, optional steel cover plates are available upon request.
Installation and Operation Guide
1. Preparation: Remove the header caps before installation. For detachable radiators, separate the upper and lower headers as shown in Figure 2.
2. Spacing: Maintain at least 50mm between adjacent radiators. The center of the lower header should be positioned appropriately above ground level to ensure air circulation.
Fixed Radiator Installation
Drill holes in the transformer tank wall corresponding to the manifold diameter, and weld the radiator directly to the outer wall. All welding must be performed externally to prevent debris from entering the radiator channels.
Detachable Radiator Installation
(1) Match the flange interfaces on the transformer tank with the radiator’s center distance, group spacing, and flange size. Use suitable gaskets, bolts, nuts, and washers.
(2) Lift the radiator carefully with a hook, align upper and lower flanges, insert gaskets, and tighten bolts. Secure adjacent radiators with connecting plates.
(3) During oil filling, close the oil drain plug and open the air bleed plug. Once oil overflows from the air vent, tighten the plug again.
(4) For bottom-blown air cooling, attach one fan for every two radiator groups. If an odd number of groups exist, follow the dimensional arrangement in Figure 4. Custom fan brackets can be provided.
(5) For side-blown air cooling, securely mount fans on the transformer tank at appropriate positions.
Precautions
(1) During transportation, installation, and flushing, handle radiators carefully to avoid deformation or damage to oil channels.
(2) If a sealing test is required before installation, the internal pressure should not exceed 0.12 MPa (1.2 times atmospheric pressure).
Advantages of Our Transformer Radiators
Our customized transformer heat sinks offer superior corrosion resistance, precise welding quality, and stable performance under continuous operation. With full compliance to JB and IEC standards, they ensure efficient transformer cooling and extended equipment lifespan.
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