About Us
Global Transformer Engineering
Pioneering 3D Wound Core Technology for Modern Grids
Over 30 Years of Excellence in Power Transformer Manufacturing
Founded with a vision for green and reliable power distribution, Haihong Electric (Tronwise) has grown into a leading transformer manufacturer covering extensive production bases. We specialize in the R&D, design, and manufacturing of 3D wound core dry-type and oil-immersed transformers.
Equipped with automated manufacturing systems, advanced vacuum casting equipment, and comprehensive testing laboratories, we deliver high-efficiency, low-loss, and ultra-quiet power solutions to utility, renewable energy, and industrial projects worldwide.
Some Cool Facts
Numbers Speak For Themselves
Annual Production Capacity (Units)
Years of Industry Experience
Global Export Countries & Regions
Quality Comes First! We Make Sure That Every Minute Detail Is Looked Into While Manufacturing Even The Smallest Product. Our Focus Is 100% On Client Needs And Satisfaction.
Patented Core Technology
Our proprietary 3D wound core design balances three-phase magnetic circuits, significantly reducing no-load losses, excitation current, and operational noise.
Rigorous Testing Standards
Every unit undergoes full routine and type testing—including partial discharge, temperature rise, and impulse tests—complying strictly with IEC and IEEE standards.
Full Global Compliance
Certified with CE, UL, and CSA standards, providing complete engineering documentation, CAD drawings, and factory-direct technical support for EPC contractors.