ONAN Cooling 500 Kva Distribution Transformer Manufacturer S(B)13-NX3 Energy Efficiency Level 3

Practical Application Value of Model Parameters

• "S(B)": As a standard identifier for three-phase oil-immersed distribution transformers, "S" is clearly compatible with the three-phase 380V power distribution system, meeting the simultaneous power supply needs of multiple users and devices. "B" indicates that the low-voltage side adopts foil windings. Compared with traditional wire-wound windings, foil windings have a larger conductor contact area and more uniform current distribution, with current-carrying capacity increased by 20%-25%, which can better cope with short-term load growth common in rural and suburban areas.
• "13": It is a classic design series in the field of oil-immersed transformers. Verified by the market for decades, it has mature technology in iron core lamination process (adopting skew-joint design to reduce magnetic resistance) and oil tank sealing structure (using double-layer sealing strips). The annual failure rate of the equipment is less than 0.4%, and the later operation and maintenance difficulty is low, making it suitable for grass-roots power distribution scenarios lacking professional operation and maintenance teams.
• "NX3": A model suffix optimized for basic power distribution scenarios, it supports conventional voltage ratios such as 10kV/0.4kV and can be directly connected to standard lines of urban and rural distribution networks. The internal wiring adopts a standardized design, requiring no complex debugging during on-site installation—only cable connection is needed, which significantly shortens the construction period.
• "Energy Efficiency Class 3": It complies with the national basic energy efficiency standard for oil-immersed distribution transformers (GB 20052-2020). Under a load rate of 40%-60% (a common load range in basic power distribution scenarios), the energy efficiency value remains stable at 0.91-0.93. Although it does not have the energy-saving advantages of high-energy-efficiency models, it can already meet the conventional power distribution needs of rural and suburban areas. Moreover, its initial investment is lower, resulting in better cost-effectiveness.

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Company Profile

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Guanggao Transformer is a professional transformer manufacturer. We produce single-phase, three-phase, dry-type, distribution, and high-voltage transformers (110 kV and above). We meet IEEE/ANSI/UL/CSA and IEC standards. Guanggao Transformer has nearly 25 years of transformer export experience. The company has modern laboratory construction, such as high-voltage test hall, within which there is a 3000kV lightning impulse testing device, and some advanced testing equipment, such as CA-21 moisture analyzer from Mitsubishi, American Fluke Ti30 infrared image detector, American RM-3WE three dimensional vibration. And it was identified as the national power transformer energy efficiency testing laboratories in 2011.

The company has undertaken the National Olympic Security Power Project, the National 851 project, the whole construction of the Guangzhou Asian Games, Guangzhou BRT and other important security power projects. The products used in the above projects are highly safe and in a reliable operation throughout the country. Also, these products are exported to Myanmar, Madagascar, Malaysia,other countries. Enjoying a good reputation on the electromechanical market, "Guanggao Brand"was identified as Guangdong famous brand, the product was identified as the National Energy Efficiency Star Products and Brand-Name Products in Guangdong Province.If you have transformer needs, please contact us.

Contact us

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•    Add: No. 15, Yunpu 1st Road, Yunpu Industrial Zone, Huangpu, Guangzhou, Guangdong, China
•    Tel: (+86)-020-82505003
•    Email: ggelectric@gz-gg.com