Hebei Anmei Electrical Equipment Co., Ltd. is one of the most reliable manufacturers and suppliers of porcelain transformer bushing in China, also supports customized service. If you're going to buy high quality porcelain transformer bushing made in China, welcome to get quotation from our factory.
Porcelain Transformer Bushing remains one of the most enduring and trusted insulation components in high-voltage power systems, having served the global electrical industry for over a century with a proven record of reliability across diverse climatic and pollution conditions.
Key Technical Standards
Modern porcelain bushing products are manufactured in strict compliance with the following international standards:
| Standard | Scope |
|---|---|
| IEC 60137 | Insulated bushings for alternating voltages above |
| DIN 42530 / 42531 / 42532 | DIN designs for various voltage and current ratings |
| BS EN 50180-1 | Bushings above 1 kV up to 52 kV, 250 A to 3.15 kA |
| ANSI / IEEE C57.19 | American standard for transformer bushings |
Typical Ratings
| Parameter | Typical Range |
|---|---|
| Voltage Rating | 1.1 kV – 52 kV (up to 550 kV for special designs) |
| Current Rating | 250 A – 8,000 A |
| BIL (Basic Insulation Level) | 20 kV – 170 kV+ |
| Creepage Distance | Per standard pollution classes; high-creepage versions available |
| Operating Temperature | -40°C to +80°C |
| Frequency | 50 / 60 Hz |
The manufacturing process of a porcelain transformer bushing is both an art and a science. The porcelain body is formed from a precise blend of clay, quartz or alumina, and feldspar, then coated with a smooth glaze to shed water and minimize contamination buildup. Alumina-rich formulations are preferred when high mechanical strength is required. The entire process-from raw material preparation to high-temperature firing-demands rigorous quality control, as even microscopic defects can compromise the dielectric integrity of the finished product.
Material Composition & Properties
| Component | Function |
|---|---|
| Clay | Base material providing plasticity |
| Quartz / Alumina | Structural strength and thermal stability |
| Feldspar | Fluxing agent for vitrification |
| Glaze coating | Water shedding and contamination resistance |
| Property | Porcelain |
|---|---|
| Dielectric Strength | 4 – 10 kV/mm |
| Mechanical Strength | High (alumina-rich grades) |
| UV Resistance | Excellent |
| Water Absorption | < 0.5% (non-porous) <0.5% |
| Service Record | 100+ years |
In terms of application, these bushings serve a critical function: they safely guide high-voltage conductors through the grounded walls of transformer tanks, switchgear enclosures, and other apparatus. They provide not only primary electrical insulation but also mechanical support for winding leads and protection against environmental stressors such as rain, dust, and salt fog. Common installation scenarios include:
| Application | Description |
| Power Transformers | Main insulation for high-voltage windings |
| Distribution Transformers | Medium-voltage side insulation |
| Switchgear & Circuit Breakers | Through-wall or through-enclosure insulation |
| Wall Bushings | Indoor-to-outdoor conductor transition |
Comparison: Porcelain vs. Polymer Composite
| Feature | Porcelain | Polymer Composite |
|---|---|---|
| Service Record | 100+ years | ~25 years |
| UV Resistance | Excellent | Moderate (requires UV stabilizers) |
| Mechanical Strength | High (brittle) | Good (flexible) |
| Surface Hydrophobicity | Low (glaze only) | High (inherent) |
| Field Repair | Not possible for cracks | Limited repairability |
| Cost | Moderate | Higher |
| Contamination Flashover | More sensitive to pollution | More resistant |
HEBEI ANMEI ELECTRICAL EQUIPMENT CO.,LTD.is a specialized manufacturer of high-voltage insulation products, with a core focus on porcelain transformer bushings for medium and extra-high voltage applications. Our products are designed and tested in full compliance with IEC, DIN, and ANSI standards, serving utilities, transformer OEMs, and engineering contractors across Asia, Europe, and the Americas. We combine century-proven porcelain technology with modern quality assurance systems to deliver bushings that offer reliable performance, competitive lead times, and comprehensive technical support. For inquiries or customized solutions, please contact our sales team.
https://www.anmeibushing.com/transformer-bushing/
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