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 Bushing 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 bushingsensure 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.
Based on accelerated thermal aging tests (per IEC 60216) and over 5,000 unit-years of field data, our bushings demonstrate a practical service life exceeding 40 years at rated load and within the temperature range of –40 °C to +105 °C. The epoxy system exhibits negligible dielectric aging – less than 0.5% reduction in breakdown voltage after 30 years of equivalent thermal stress. The primary life-limiting factor is external environmental contamination, which is effectively mitigated by our hydrophobic surface and optional increased creepage distance.
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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