How to Select Plate-Type Radiators for Distribution Transformers of Different Capacities?
1. Small-Capacity Distribution Transformers (10–100 KVA)
Cooling Characteristics:Small-capacity transformers generate relatively little heat. Because the load current is low, copper loss and core loss are limited, so a large cooling area is generally unnecessary.
Radiator Selection Guidelines:A plate-type radiator with a small heat-dissipation area is sufficient. For this capacity, the radiator area typically ranges from 1 to 3 square meters.Since the transformer itself is compact, the radiator dimensions must match the transformer to avoid installation interference or layout issues.
In terms of material, standard aluminum alloys are a good choice—they offer good thermal conductivity, meet the cooling needs of small transformers, and are relatively cost-effective.

2. Medium-Capacity Distribution Transformers (100–1000 KVA)
Cooling Characteristics:Heat generation increases significantly due to higher copper and core losses, especially under high load conditions. A sufficient cooling area is required to maintain the transformer within a safe operating temperature range.
Radiator Selection Guidelines:These transformers typically require plate-type radiators with 3–10 square meters of heat-dissipation area.When selecting, both the radiator’s cooling efficiency and structural strength should be considered. For example, radiators with moderate fin spacing are ideal—they ensure good ventilation for convection, while maintaining a compact structure.Preferred materials include high-performance aluminum alloys or copper alloys, which have higher thermal conductivity and transfer heat more efficiently.Additionally, the installation method must ensure a secure connection without interfering with other transformer components.

3. Large-Capacity Distribution Transformers (Above 1000 KVA)
Cooling Characteristics:Large-capacity transformers generate substantial heat, requiring strict and highly efficient cooling. If this heat is not dissipated quickly enough, the transformer temperature can rise sharply, affecting both performance and service life.
Radiator Selection Guidelines:These transformers generally require plate-type radiators with 10 square meters or more of heat-dissipation area.In addition to large cooling surfaces, auxiliary cooling measures may also be necessary, such as forced-air cooling radiators equipped with fans.Material selection should favor high thermal conductivity copper alloys, and attention must be given to sealing reliability to prevent transformer oil leakage.Structural design must also account for significant thermal and mechanical stresses to ensure long-term performance.
Installation conditions—such as indoor/outdoor placement and ventilation—must also be considered.For example, large transformers installed indoors with poor ventilation may require even larger radiator areas or stronger forced-air cooling systems.