High Voltage Transformer Bushing
01
DIN 24KV250 Transformer Bushing Insulators CD525
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product description
DIN 24kV 250A Transformer Bushing Insulator with a Creepage Distance (CD) of 525mm.
Specifications:The relevant standard is likely DIN 42531, which specifically covers outdoor bushings for transformers in the 12 kV and 24 kV voltage classes.
Voltage Rating: 24kV (Um)
This denotes the maximum system voltage the insulator is designed for continuous operation. This typically corresponds to electrical systems with a nominal voltage (Un) of 20 kV.
Current Rating: 250A
This signifies the rated continuous current that the bushing's conductor can handle without exceeding temperature limits.
Creepage Distance (CD): 525mm
This is the shortest distance along the surface of the insulator between the energized terminal and the grounded flange. A creepage distance of 525 mm is a common specification for 24kV (Um) bushings intended for standard outdoor installation under normal or light-to-moderate pollution conditions (e.g., roughly corresponding to Pollution Level I or II).
General Description
This component is an outdoor transformer bushing insulator designed according to German standards for use on oil-filled distribution transformers operating within 20 kV nominal voltage networks (up to 24 kV maximum system voltage). It provides a safe and reliable means for a conductor carrying up to 250A to pass through the transformer's grounded tank wall while maintaining electrical insulation.
Material
Commonly manufactured from high-grade electrical porcelain (typically with a brown glaze) due to its excellent insulating properties and weather resistance.
Construction
Features a central conductor rod, the main insulating body equipped with weather sheds (skirts) to increase the effective surface path (creepage) and prevent flashover, a mounting flange for secure attachment and grounding to the transformer, and connection terminals at both ends.
Application
Widely used on the high-voltage side of oil-filled distribution transformers found in outdoor substations or pole-mounted installations in 20 kV distribution systems. The 525mm creepage distance makes it suitable for typical outdoor environments where heavy pollution is not a primary concern.