EN‑Standard Porcelain Transformer Bushing: Full‑Range Specifications, Material Property And Application Scenarios
EN porcelain transformer bushing is the classic, long‑service‑life insulating sleeve following European EN 60137 industrial criteria. High‑quality wet‑process fired electrical porcelain acts as its main insulating shell, equipped with built‑in copper conductor rods and metal mounting flanges. This traditional‑style EN bushing remains one top‑searched transformer‑spare‑part keyword for outdoor oil‑immersed distribution‑transformer maintenance and new‑equipment assembly.
The most‑popular large‑current EN porcelain‑bushing specification covers rated‑voltage 1kV‑3kV and adjustable rated‑current 250A‑3150A. High‑current‑grade 3150A EN porcelain bushings serve large‑capacity main transformers inside regional‑grid substations, while 250A‑800A small‑current porcelain EN sleeves are used on community‑level small‑size distribution transformers.
Complete Specification List Table For Mainstream EN‑Standard Porcelain Transformer Bushing
| Rated Voltage Grade | Available Rated‑Current Range | Outer‑Shell Porcelain Glaze Colour | Terminal Type | Recommended Working‑Location |
|---|
| 1 kV | 250A‑1250A | Brown / Grey glazed | Spade copper terminal | City‑area oil‑immersed distribution transformers |
| 2 kV | 630A‑2000A | Grey glazed | Flag‑style copper connector | Industrial‑zone heavy‑load power transformers |
| 3 kV | 800A‑3150A | Brown glazed | Large‑size spade fitting | Substation large‑capacity main transformers |
Electrical‑grade porcelain material grants EN porcelain‑type bushings multiple excellent physical traits. Fired porcelain boasts strong compression‑resistance, outstanding high‑temperature tolerance, stable insulating performance under long‑term transformer‑oil soaking and good resistance against acid‑alkaline industrial pollutants. The outward‑extended umbrella‑shaped porcelain sheds lengthen surface creepage distance, effectively stopping surface electric‑flash‑over accidents during rainy and damp weather for outdoor‑installed transformers.
EN porcelain transformer bushings cover diversified terminal choices. Spade‑type terminals fit low‑voltage winding outlets, while round‑stud terminals are widely adopted on high‑voltage transformer sides. Every EN‑certified porcelain bushing undergoes factory‑based power‑frequency voltage‑withstand testing, partial‑discharge inspection and creepage‑distance measurement to meet European power‑access standards.
When compared to epoxy‑resin dry‑type bushings, EN porcelain‑type sleeves enjoy cost advantages for high‑current low‑voltage transformer projects. The mature porcelain‑making manufacturing‑process lowers unit‑product cost for mass‑ordered 1‑3kV, 250‑3150A large‑current EN porcelain bushings. Most outdoor oil‑immersed transformers still pick porcelain EN‑standard bushings, as porcelain shells endure outdoor temperature cycles, sunlight ultraviolet aging and bad weather erosion far better than polymer insulation materials.
