Hebei Anmei Electrical Equipment Co., Ltd. is one of the most reliable manufacturers and suppliers of transformer bushing din type in China, also supports customized service. If you're going to buy high quality transformer bushing din type made in China, welcome to get quotation from our factory.
The DIN standard transformer bushing is a precisely engineered electrical component that serves as the critical interface between the internal windings of a power transformer and the external overhead lines or busbars. Manufactured from high-grade electrical porcelain, oxygen-free copper, and advanced epoxy resins, these bushings are designed to withstand extreme electrical stresses, thermal cycling, and mechanical vibration over decades of service. Our primary clientele includes transformer OEMs, electrical utility companies, renewable energy project developers, and heavy industrial plants such as steel mills and cement factories, all of whom demand uncompromising reliability and strict adherence to European grid codes.
From a technical standpoint, the DIN standard transformer bushing must satisfy the rigorous requirements of DIN 42530, DIN 42539, and the internationally recognized EN 50180/50243 standards. These specifications govern critical parameters such as creepage distance, dry arcing distance, flange dimensions, and partial discharge levels. For example, a typical 24kV/1250A bushing requires a minimum creepage distance of 480mm for medium-pollution environments, ensuring that surface leakage currents remain within safe limits even during fog, rain, or industrial dust conditions. The internal conductor, often made of tinned copper or brass, is rated for continuous current carrying capacity and short-circuit withstand capability, while the porcelain housing provides both electrical insulation and mechanical protection against impact and UV degradation.
A frequently asked question among procurement engineers is:
1.How do I select the correct DIN standard transformer bushing for a 33kV / 20MVA transformer with an outdoor installation in a coastal area?
The selection process involves four key steps:
(1) determining the system voltage and rated current
(2) calculating the required creepage distance based on site pollution class (e.g., Class IV heavy pollution requires ≥31mm/kV)
(3) choosing between vertical or horizontal mounting orientation,
(4) specifying the oil-end thread size to match your transformer turret.
Additionally, for high-altitude locations above 1000m, derating factors must be applied to both voltage and creepage distances. Our technical team provides free selection worksheets and 3D model drawings to simplify this process for our customers.
2.DIN vs. ANSI/IEEE bushings - what's the difference?
Mainly flange dimensions and creepage baselines. DIN is common in Europe; ANSI/IEEE in North America. Electrical tests follow IEC 60137, but mechanical interfaces are not interchangeable.
3.OIP or RIP dry-type bushing - which should I choose?
OIP: lower cost, low loss, proven 40+ years, but has oil leakage risk. RIP: oil-free, maintenance-free, ideal for hydro plants, urban substations, and green energy projects.
4. When should I choose composite bushings over porcelain?
Choose composite for seismic zones, coastal salt-spray, heavy dust, or overhead line terminations. It's 60–70% lighter, more hydrophobic, and won't shatter on fault.
5.How do I calculate the required creepage distance?
Required distance = highest system voltage × pollution class ratio. Reference: Class I ≥16, Class II ≥20, Class III ≥25, Class IV ≥31 mm/kV.
6. Any special notes for high-altitude use?
Above 1000m, derate voltage per IEC 60137 and add 10–15% creepage margin. Above 2000m, ask the factory for a corrected selection table.
7. What tests are done before shipment?
100% routine tests: AC withstand, partial discharge, and tan δ. IEC 60137 type test reports available on request. Records kept 20+ years.
Beyond standard porcelain versions, we also offer composite-material DIN standard transformer bushing (复合绝缘套管) variants using silicone rubber housings, which provide enhanced hydrophobic properties and lighter weight, ideal for seismic zones or overhead line terminations where mechanical load is a concern. For oil-filled transformers, we recommend the oil-impregnated paper (OIP) core design, which delivers excellent dielectric dissipation factor (tan δ < 0.005) and has proven its longevity in the field for over 40 years. Alternatively, for environmentally sensitive installations such as hydroelectric plants or urban substations, our resin-impregnated paper (RIP) dry-type bushings eliminate the risk of oil leakage and require zero maintenance, aligning with green energy initiatives. Each bushing undergoes 100% routine testing including AC withstand voltage, partial discharge measurement, and tangent delta evaluation before shipment.
Quality & Customization
We understand that no two transformer projects are identical. Therefore, our DIN standard transformer bushing (DIN标准变压器套管) product line offers extensive customization options: tin-plated or silver-plated terminals, special bolt-circle drilling patterns, extended creepage distances for extreme pollution, and integrated potential taps for voltage monitoring or dielectric testing
We also provide complete type-test reports in accordance with IEC 60137, including lightning impulse (1.2/50µs), switching impulse, and temperature-rise tests, ensuring full traceability and compliance for your project documentation. All products are manufactured in an ISO 9001 and ISO 14001 certified facility, with raw material certificates and inspection records retained for a minimum of 20 years.
Choose our DIN standard transformer bushing for a proven combination of heritage, material science, and precision engineering – trusted by over 200 utility and OEM partners worldwide.
https://www.anmeibushing.com/transformer-bushing/
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