Finding a reliable, high-quality BS standard porcelain bushing for your transformer is critical for ensuring long-term safety, stability, and performance of your power equipment. A substandard bushing can lead to failures, outages, and significant costs. This guide breaks down the key steps and considerations to help you source the best product.
1. Understand the BS Standard (BS 223 / BS 137)
The first step is knowing the standard. “BS” refers to British Standards. For high-voltage porcelain bushings, the relevant specification is often BS 223 or related standards like BS 137 for ceramic insulation. These standards define:
- Dielectric Strength: The ability to withstand high voltages without breakdown.
- Mechanical Strength: Resistance to bending, torsion, and compression forces.
- Dimensions and Tolerances: Precise size requirements for a proper fit.
- Testing Procedures: Rigorous tests for power frequency withstand, impulse withstand, and temperature cycling.
When searching, always specify “BS 223 Porcelain Bushing” or “BS Standard Transformer Bushing” to filter suppliers correctly.
2. Key Quality Indicators for Porcelain Bushings
Not all bushings labeled “BS Standard” are equal. Look for these quality markers:
- Material & Glazing: High-grade alumina porcelain with a smooth, even, and glossy glaze. This prevents moisture absorption and surface tracking.
- Manufacturing Process: Isostatically pressed porcelain offers superior uniformity and strength compared to slip-cast methods.
- Metal Fittings: Galvanized steel or aluminum alloy fittings should be securely cemented to the porcelain without cracks or gaps. Check for corrosion resistance.
- Certification & Test Reports: Reputable manufacturers provide type test reports and routine test reports according to BS/IEC standards. Always request these documents.
3. How to Vet Suppliers and Manufacturers
- Specialization: Prefer suppliers specializing in transformer components or high-voltage insulators over general hardware exporters.
- Manufacturing Capability: Inquire about their production process, quality control labs, and experience with BS standard products.
- Sample Evaluation: Before bulk ordering, request a sample. Perform visual inspections and, if possible, basic dimensional and dielectric tests.
- Reputation & Reviews: Check for company history, client testimonials (especially from transformer OEMs or utilities), and industry certifications.
4. Crucial Questions to Ask Before Purchasing
- “Can you provide the complete BS/IEC type test certificate for this bushing model?”
- “What is your routine testing procedure for each batch?”
- “What is the typical failure rate or lifetime expectancy under normal service conditions?”
- “Do you offer custom designs based on specific transformer drawings?”
Conclusion
Sourcing a good quality BS standard porcelain bushing requires due diligence. Focus on understanding the standard, recognizing physical quality signs, and partnering with credible, specialized manufacturers who provide full test documentation. Investing time in the selection process safeguards your transformer’s integrity and ensures a safe, continuous power supply.
Changsha Rich Power is a professional manufacturer of porcelain bushing in China, we offer OEM production for many customers. Contact us today for more discount and technical support. Email: sales@asiapower.net
