Hebei Anmei Electrical Equipment Co., Ltd. is one of the most reliable manufacturers and suppliers of transformer secondary bushing in China, also supports customized service. If you're going to buy high quality transformer secondary bushing made in China, welcome to get quotation from our factory.
Transformer secondary bushings are the critical low-voltage interface components that must simultaneously satisfy electrical insulation, mechanical support, and thermal dissipation requirements, and selecting the correct specification is as important as the bushing's material quality in determining the overall service life of a distribution or power transformer.
Our standard product series is designated as YF-SB series, covering three main mechanical configurations: Type A (flange-mounted, oil-to-air sealing, suitable for oil-filled transformers), Type B (wall-penetrating, dry-type sealing, suitable for solid-insulated switchgear), and Type C (screw-in direct mounting, suitable for compact pole-mounted transformers), each engineered to meet specific installation constraints and dielectric requirements.
For the most widely used distribution transformer applications (typically 10 kV primary / 0.4 kV secondary), our recommended model is YF-SB-12/630-AA, which features a 12 kV rated lightning impulse withstand voltage (75 kV BIL), 630 A continuous current rating, a creepage distance of 200 mm for normal pollution environments, and a standard copper conductor with M12 output studs on both the internal and external connection ends.
For heavy industrial loads and large commercial complexes requiring higher secondary current capacity, we offer the YF-SB-12/1600-BB model, rated at 1600 A continuous current with a 12 kV voltage class, featuring dual parallel M16 output studs on each terminal to accommodate larger cable lugs, a reinforced epoxy housing with 280 mm creepage distance for moderate pollution levels, and an integrated temperature sensor port for optional winding temperature monitoring.
For renewable energy projects, particularly solar farms with long cable runs from transformer to inverter skids, we developed the YF-SB-36/2500-CC model, a 36 kV voltage class bushing rated at 2500 A with a silicone rubber composite housing offering a Class I pollution creepage distance of 560 mm, equipped with silver-plated copper conductors and corrosion-resistant stainless steel mounting flange specifically designed for the high-corrosion outdoor environments typical of desert and coastal PV installations.
| Model | Voltage Class | Current Rating | Creepage Distance | Pollution Class | Housing Material | Mounting Type |
|---|---|---|---|---|---|---|
| YF-SB-12/630-AA | 12 kV | 630 A | 200 mm | Class I | Epoxy | Flange-mounted |
| YF-SB-12/1600-BB | 12 kV | 1600 A | 280 mm | Class II–III | Reinforced epoxy | Wall-penetrating |
| YF-SB-36/2500-CC | 36 kV | 2500 A | 560 mm | Class I | Silicone rubber | Screw-in |
FAQ
What is the typical service life of a secondary bushing, and what factors most significantly shorten it?
How do I select the correct secondary bushing model for my transformer based on voltage, current, and environmental conditions?
What installation mistakes most commonly lead to premature secondary bushing failure, and how can they be avoided?
4. Do you support customized transformer secondary bushings?
Yes. We support customized transformer secondary bushings, including special voltage classes, current ratings, creepage distances, mounting configurations, conductor materials, and terminal dimensions. Our engineering team can develop solutions based on your transformer parameters, and we also support OEM/ODM requirements for international projects.
5. Which standards do your transformer secondary bushings comply with?
Our transformer secondary bushings are designed, manufactured, and tested in accordance with relevant IEC and ANSI/IEEE standards for low-voltage transformer bushings. Routine tests include power-frequency withstand voltage, partial discharge measurement, and loss tangent and capacitance measurement. Type tests such as lightning impulse withstand and temperature rise are also performed to validate design performance.
6. What is the lead time for transformer secondary 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.
7. Can you provide test certificates and quality documents?
Yes. Every transformer secondary 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.
8. What is the difference between a transformer secondary bushing and a primary bushing?
Transformer secondary bushings are low-voltage interface components, typically rated for 0.4 kV to 36 kV, and are used on the secondary side of distribution or power transformers. Primary bushings are high-voltage components, typically rated for 24 kV to 170 kV or above, and are used on the primary side. Secondary bushings focus on current capacity, thermal dissipation, and mechanical support, while primary bushings focus on dielectric strength and pollution resistance.
We provide a detailed technical datasheet for each model, including outline drawings with critical mounting dimensions, bushing weight, oil filling volume (if applicable), allowable cantilever load values, and temperature rise curves under various load factors. These documents are available upon request in both Chinese and English, and our engineering team can provide loading capability calculations for specific transformer designs.
Contact us today to discuss your transformer secondary bushing requirements. Our experienced engineers and sales representatives are available via email, phone, and online video meeting to provide prompt assistance. We also welcome factory visits and sample testing upon prior arrangement.
https://www.anmeibushing.com/products
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