DIN 20NF250A Transformer Bushing Insulators
High Voltage Transformer Bushings
Product Overview
The general DIN 20NF250A listing for the 20 kV class at 250 A, used to connect transformers and generators to high voltage transmission lines. Construction follows the standard high voltage porcelain generator bushing arrangement: a porcelain shell of alumina and mica, a silicon steel sheet iron core and a conductor of electrolytic copper or aluminium alloy, all chosen for resistance to pressure, heat, arc and dirt.
Key benefits
Why Buyers Choose This Part
- 20NF250A pattern ordered against the plain DIN reference
- Alumina and mica shell for insulation and mechanical strength
- Silicon steel core that lowers hysteresis and iron loss
- Conductor of electrolytic copper or aluminium alloy
Application scenarios
Where It Is Used
- 20 kV transformer terminal boards on DIN patterns
- Generator connections into transmission networks
- Enquiries quoting the plain 20NF250A reference
- Replacement during transformer refurbishment
Who it is for
Who It Suits
- Transformer manufacturers using the DIN NF series
- Procurement teams quoting by the plain reference
- Distributors supplying 20 kV bushings
Problems it solves
What Goes Wrong Without The Right Part
- Enquiries that name the pattern without quoting the DIN number
- Losses in the conductor and core under continuous load
- Insulation degraded by arc and airborne contamination
- Split sourcing across the DIN and EN ranges
Technical features
How It Is Built
- DIN 20NF250A pattern
- 20 kV class at 250 A
- Porcelain shell of alumina and mica ceramic
- Silicon steel sheet iron core
- Electrolytic copper or aluminium alloy conductor
- Good resistance to high pressure, high temperature, arc and dirt
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.
| DIN 20NF Pattern | 250 A |
|---|
Materials
Materials
- Alumina and mica ceramic shell
- Silicon steel sheet core
- Electrolytic copper or aluminium alloy conductor
Manufacturing
Process
- Shell forming
- Glazing
- Firing
- Core and conductor assembly
- Inspection and testing
Quality control
Testing
- Strict inspection and testing before installation
- Conductor path verification
- Shell integrity and glaze inspection
Certifications
Certification
- ISO 9001 quality management system
Customisation
Customisation Options
- Special lengths and screw sizes
- Copper or aluminium alloy conductor
- Produced to drawing or sample
Comparison
How It Compares
| DIN 42531 20NF-250A | The same pattern quoted with the DIN standard number explicitly. Use whichever reference your drawing carries. |
|---|---|
| DIN 20NF630A | Same voltage class with a 630 A conductor path and 440 mm creepage. Match the bushing current to the transformer rating. |
Use guide
Before You Order And After It Arrives
- Quote either the plain reference or the DIN 42531 number, both resolve to this pattern
- Ask for the dimensioned drawing before confirming the order
- Test and inspect before energising
- Apply protective grounding and lightning protection
Questions
DIN 20NF250A Transformer Bushing Insulators Questions
Is this the same as the DIN 42531 20NF-250A?
Yes, the same 20 kV 250 A pattern. This listing carries the plain reference and the other quotes the DIN standard number.
What is the rated voltage and current?
The 20 kV class at 250 A.
What is the bushing made of?
A porcelain shell of alumina and mica, a silicon steel sheet core, and a conductor of electrolytic copper or aluminium alloy.
What environmental resistance does it have?
The structure and materials resist high pressure, high temperature, arc and dirt.
Can you confirm creepage before I order?
Yes. Ask on WhatsApp and we will send the drawing figures for the exact variant.
Do you accept drawings?
Yes, we produce to customer drawings and samples.
Related
Related Products
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- Minimum Creepage Distance 270 mm
- Net Weight 2.66 kg
- Height 332 mm
EN 50180 24kV 250A Transformer Bushing Type 3
DIN 30NF250 36kV Transformer Bushing
- High Voltage Class 36 kV
EN 50180 24kV 250A Porcelain Transformer Bushing
- Standard IEC60137
Keep reading
Related Cases Guides And Applications
Guide
Transformer Bushing Selection A Guide For Engineers
GuideWhat Is A High Voltage Transformer Insulator
GuideThe Five Jobs An Insulator Does Inside A High Voltage Transformer
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 Insulators
Send the quantity and any drawing you have. Enquiries are answered within 24 hours, and we produce to customer drawings and samples.