DIN 20NF250A Transformer Bushing CD480
High Voltage Transformer Bushings
Product Overview
A DIN 42531 bushing for 20 kV transformers at 250 A, built with a 480 mm creepage distance for outdoor service. It leads the high and low voltage connections from inside the transformer tank to the outside, insulating the lead to ground and fixing it in position. Conductors are supplied as single or solid aluminium alloy, and the porcelain withstands rain, strong sunlight and moisture.
- DIN 42531
Key benefits
Why Buyers Choose This Part
- Built to DIN 42531, the pattern most transformer drawings in this class call out
- 480 mm creepage for outdoor sites with normal to moderate pollution
- 125 kV lightning impulse withstand with 50 kV power frequency withstand
- Single or solid aluminium alloy conductors to match your busbar
Application scenarios
Where It Is Used
- 20 kV distribution transformers in outdoor substations
- Pole-mounted transformers exposed to rain and direct sun
- Transformer rectifier assemblies in distribution and transmission service
- Projects specified against DIN 42531 by clause
Who it is for
Who It Suits
- Transformer manufacturers working to DIN 42531
- Distributors supplying 20 kV outdoor transformer parts
- Substation maintenance teams replacing DIN-pattern bushings
Problems it solves
What Goes Wrong Without The Right Part
- Bushings that degrade under strong sunlight and repeated wetting
- Creepage that is too short once the site accumulates airborne dirt
- Aluminium to copper joints that corrode at the terminal
- Specification mismatch when a non-DIN bushing is offered as equivalent
Technical features
How It Is Built
- Manufactured to DIN 42531
- 480 mm creepage distance
- 50 kV power frequency withstand voltage
- 125 kV lightning impulse withstand voltage
- Single or solid aluminium alloy conductor options
- Resistant to rain, sunlight and moisture
Specifications
Published Figures For This Product
Every value below comes from the manufacturer data for this item. Figures not listed are confirmed against the drawing before an order is placed.
| Creepage Distance | 480 mm |
|---|---|
| Power Frequency Withstand Voltage | 50 kV |
| Lightning Impulse Withstand Voltage | 125 kV |
Materials
Materials
- Electrical porcelain shell
- Single or solid aluminium alloy conductor
Manufacturing
Process
- Porcelain forming
- Glazing
- Firing
- Conductor fitting
- Routine electrical test
Quality control
Testing
- Creepage verified against the 480 mm figure
- Power frequency withstand test at 50 kV
- Lightning impulse withstand verification at 125 kV
Certifications
Certification
- Manufactured to DIN 42531
- ISO 9001 quality management system
Customisation
Customisation Options
- Single or solid aluminium alloy conductor to your choice
- Creepage distance varied to suit the pollution class
- OEM and ODM marking accepted
Comparison
How It Compares
| DIN 20NF630A | Same DIN family and voltage class, but 250 A rather than 630 A. Match the bushing current to the transformer rating, not the other way round. |
|---|---|
| Bushings without a stated standard | DIN 42531 fixes the dimensions and test values, so a replacement fits the terminal board and meets the same test figures. |
Use guide
Before You Order And After It Arrives
- Confirm your drawing calls out DIN 42531 and not a neighbouring DIN number
- Choose the conductor type that matches your cable lug metal
- Inspect the porcelain after transport before fitting to the tank
- Do not exceed the 250 A continuous rating on the terminal
Questions
DIN 20NF250A Transformer Bushing CD480 Questions
Which standard is this bushing built to?
DIN 42531.
What is the creepage distance?
480 mm, which is why the part carries the CD480 suffix.
What are the withstand voltages?
50 kV power frequency withstand and 125 kV lightning impulse withstand.
What conductor options are there?
Single or solid aluminium alloy conductors. Tell us which your connection needs.
Will it hold up outdoors?
Yes. The bushings are built to withstand rain, strong sunlight and moisture, and are tested to international quality standards.
Can I get a sample before a production order?
Ask on WhatsApp. Samples are arranged case by case depending on the pattern.
Related
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DIN 30NF250 36kV Transformer Bushing
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EN 50180 24kV 250A Porcelain Transformer Bushing
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IndustryDistribution Transformer Manufacturers
IndustryPower Utilities And Substations
SolutionManufacturing To Your Drawing Or Sample
SolutionSelecting Creepage For The Pollution At Your Site
Quote For DIN 20NF250A Transformer Bushing CD480
Send the quantity and any drawing you have. Enquiries are answered within 24 hours, and we produce to customer drawings and samples.