Import Cast Resin Transformer — Buy in Bulk from Supplier in China

Cast resin transformers from Qinhuangdao Hua Sheng Long Electrical Co. Ltd. are dry-type units designed for medium voltage applications ranging from 30 kVA to 2500 kVA, operating at 50 Hz with natural air cooling. The magnetic cores are constructed from low-specific-loss, high-magnetic-silicon steel with a thin inorganic Carlyte coating on both sides, cut at 45 degrees to reduce core losses and noise. Windings use electrolytic aluminum or copper strips for high-voltage coils and foils for low-voltage coils, both insulated with F-class materials and vacuum-impregnated with oven-dried resin to ensure mechanical rigidity and moisture resistance.

These transformers comply with IEC 726 standards and are built for tropicalized environments, making them suitable for high-humidity and high-temperature installations. The resin encapsulation provides flame resistance, self-extinguishing properties, and eliminates the risk of oil leaks or pollution. Unlike oil-filled units, they require no maintenance and are safe for indoor use in sensitive locations such as hospitals, airports, and underground railway systems. The design prioritizes space efficiency and operational safety, with no need for fire barriers or ventilation systems typically required for liquid-cooled alternatives.

End users include power utilities, industrial facilities, commercial high-rise buildings, and infrastructure projects such as tunnels and mining operations where fire safety and environmental compliance are critical. The units are packed in wooden crates for sea freight and shipped under standard Incoterms such as FOB or CIF. Buyers should confirm the exact voltage class, cooling method, and insulation grade before ordering, as custom configurations beyond the standard 30 - 2500 kVA range may require direct engineering consultation with the supplier.

Qinhuangdao Hua Sheng Long Electrical Co. Ltd. is a manufacturer based in Yanshan Technology Park, Qinhuangdao, China, specializing in dry-type transformers with cast resin insulation. The supplier is verified as an importer with harbor-level trust signals, indicating documented export activity. The listing confirms ISO 9001:2000 compliance but does not state certification validity, headcount, annual output, or client names. No information is provided about testing facilities, R&D capacity, or after-sales service networks.

The company produces transformers to meet IEC 726 and custom engineering requirements, with a focus on safety-critical applications. While the listing describes manufacturing processes in detail, it does not claim export volume, regional market presence, or third-party testing beyond the stated standards. Buyers should treat the supplier as a direct manufacturer with documented quality systems but must verify current certification status and production capacity through direct inquiry.