Hebei Anmei Electrical Equipment Co., Ltd. is one of the most reliable manufacturers and suppliers of resin insulated bushing in China, also supports customized service. If you're going to buy high quality resin insulated bushing made in China, welcome to get quotation from our factory.
Resin Insulated Bushings represents the culmination of over four decades of evolution in high-voltage insulation technology, transitioning from oil-impregnated paper and porcelain structures to advanced solid epoxy systems that offer superior safety, reliability, and environmental compatibility. Our manufacturing process begins with high-purity bisphenol-A epoxy resin combined with an acid anhydride hardener and specialized fillers, all carefully formulated to achieve a thermal class of 155 °C (Class F) and a glass transition temperature exceeding 120 °C. This material science foundation, paired with vacuum pressure gelation (VPG) technology, ensures that each bushing is free from internal voids or micro-cracks, delivering consistent dielectric strength above 25 kV/mm throughout the entire insulation wall.
Designed for medium to high voltage applications ranging from 24 kV to 170 kV, our resin insulated bushings serve as critical interface components between transformers, switchgear, and overhead lines. The hydrophobic nature of the epoxy surface significantly reduces contamination layer formation, maintaining high surface resistivity even in industrial or coastal environments where salt fog and cement dust are prevalent. With a low dissipation factor of less than 0.002 and excellent partial discharge resistance (≤ 3 pC at 1.2U₀), these epoxy bushings ensure minimal energy loss and long-term operational stability, making them the preferred choice for utility substations, wind farm collector systems, and heavy industrial facilities.
From a mechanical standpoint, our bushings incorporate a robust aluminum or copper conductor core, securely bonded to the resin body through a proprietary surface treatment that achieves pull-out strength exceeding 20 kN. The flange is manufactured from corrosion-resistant aluminum alloy or stainless steel, featuring multiple sealing grooves that accommodate standard O-rings for oil-tight or gas-tight connections in transformer tanks and GIS enclosures. For applications requiring enhanced tracking resistance, we offer an optional silicone rubber shed layer over the epoxy housing, effectively extending the creepage distance to 31 mm/kV while maintaining the compact dimensions that facilitate easy installation in space-constrained substation layouts.
Quality assurance is embedded at every stage of production, from incoming raw material inspection to final electrical testing. Each transformer bushing undergoes a stringent routine test sequence including power-frequency withstand voltage (dry and wet), partial discharge measurement at specified sensitivity levels, and loss tangent and capacitance measurement. In addition, we perform sample type tests for lightning impulse withstand (full wave and chopped wave), temperature rise, and thermal mechanical cycling to validate design performance under extreme conditions. Every unit is assigned a unique serial number with full traceability, and we provide complete test certificates in both English and Chinese to facilitate international project documentation and third-party inspection requirements.
Our standard product range covers system voltages from 24 kV to 170 kV, with rated currents from 100 A up to 3,150 A. For voltages above 170 kV or currents exceeding 3,150 A, we offer custom-engineered solutions based on your specific transformer or switchgear parameters. All ratings are verified through both routine testing and type testing per IEC 60137 and IEEE C57.19.01 standards.
2. Do you support customized resin insulated bushings?
Yes. We provide customized service for resin insulated bushings, including special voltage ratings, current capacities, creepage distances, flange dimensions, conductor materials, and mounting configurations. Our engineering team can develop solutions based on your transformer or switchgear parameters, and we also support OEM/ODM requirements for international projects.
3. Which standards do your resin insulated bushings comply with?
Our resin insulated bushings are designed, manufactured, and tested in accordance with IEC 60137 and IEEE C57.19.01. Routine tests include power-frequency withstand voltage, partial discharge measurement, and loss tangent and capacitance measurement. Type tests such as lightning impulse withstand, temperature rise, and thermal mechanical cycling are also performed to validate design performance.
4. What is the lead time for resin insulated bushing orders?
For standard models, the lead time is typically 15–30 days after order confirmation. For customized or large-volume orders, the lead time is usually 30–60 days, depending on technical requirements and production scheduling. We will confirm the exact delivery time in the quotation and keep you updated during production.
5. Can you provide test certificates and quality documents?
Yes. Every resin insulated bushing is assigned a unique serial number with full traceability. We provide complete test certificates in both English and Chinese, including routine test reports and, where required, type test reports. These documents are suitable for international project documentation, third-party inspection, and customer quality audits.
6. What is the difference between resin insulated bushings and oil-impregnated paper or porcelain bushings?
Compared with oil-impregnated paper bushings, resin insulated bushings use solid epoxy insulation, which eliminates oil leakage risk and reduces maintenance requirements. Compared with porcelain bushings, they offer better hydrophobic performance, lower partial discharge, and more compact dimensions. They are especially suitable for environments with salt fog, cement dust, or high contamination levels.
7. How should resin insulated bushings be installed and maintained?
Resin insulated bushings should be installed according to the approved drawing and torque specifications. The flange sealing grooves must be properly fitted with O-rings to ensure oil-tight or gas-tight connections. During operation, routine visual inspection is recommended to check for surface contamination, mechanical damage, or abnormal discharge. Thanks to the hydrophobic epoxy surface, maintenance requirements are minimal compared with traditional oil-impregnated bushings.
8. Can your resin insulated bushings be used in coastal, industrial, or wind farm environments?
Yes. Our resin insulated bushings are designed for demanding environments, including coastal areas with salt fog, industrial facilities with cement dust or chemical pollution, and wind farm collector systems. The hydrophobic epoxy surface helps reduce contamination layer formation, and an optional silicone rubber shed layer can further increase creepage distance to 31 mm/kV for enhanced tracking resistance.
From raw material selection to final factory testing, every Resin Insulated Bushing we produce is built for long-term reliability in the world's most demanding power networks. Whether you are planning a new substation, upgrading aging equipment, or solving a site-specific insulation challenge, we are ready to support you with technical expertise and responsive service. Contact us today – let's discuss how our resin insulation solutions can meet your project goals.
For technical inquiries, sample requests, or customized quotations, please feel free to contact us. Our experienced sales engineers are ready to provide prompt support and professional solutions tailored to your specific needs. We look forward to cooperating with you!
https://www.anmeibushing.com/products
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