Product Brief

In recent years, China’s annual industrial gross output has kept increasing, while the energy consumption ratio remains at a high level. High energy consumption has become a bottleneck restricting national economic development. Therefore, the state has invested substantial funds to support energy‑saving and consumption‑reduction projects. Among them, variable‑frequency speed‑regulation technology has been widely applied in various industries. It can not only optimize processing techniques, extend equipment service life and improve working efficiency, but most importantly realize energy saving and consumption reduction, which has been well‑recognized and highly concerned by users.

Dry‑type transformers for variable‑frequency speed regulation serve as the power unit of high‑voltage frequency converters. They perform functions of electrical isolation, phase shifting and multi‑pulse rectification, and are one of the core components of high‑voltage frequency converters. Mainly matched with complete cabinets of medium‑ and high‑voltage frequency converters and variable‑frequency speed regulators, they can effectively counteract harmonics when combined with frequency‑conversion power units, improve power grid quality, adjust motor speed and enhance power generation quality.

The dry‑type rectifier transformers for variable‑frequency speed regulation manufactured by our company adopt Class‑F and Class‑H insulation grades. New‑type insulation structures and advanced processes are applied in structural and electrical design to enhance short‑circuit withstand capability and electrical strength for higher reliability. Full consideration is given to the impact of harmonics generated by rectifier elements on transformer windings and iron cores during design. Sufficient design margin enables windings and iron cores to withstand additional temperature rise caused by harmonics while maintaining low noise, thus guaranteeing the service life of transformers.

Product Features

1. Outstanding characteristics including compact size, strong overload capacity, low partial discharge, excellent short‑circuit withstand capability, good heat dissipation, low noise, high efficiency, environmental‑friendliness and flame retardancy.
2. Mass production is realized through standardized design, simulation programs, drawing software and optimized manufacturing processes.
3. Advanced wire extruding equipment is adopted for wire processing to achieve smooth and burr‑free wire surface for more reliable electrical performance.
4. Full consideration of winding temperature rise induced by harmonics during design and manufacture effectively ensures transformer service life.
5. Class‑H products adopt VPI (Vacuum Pressure Impregnation) painting followed by high‑temperature curing, delivering excellent moisture‑proof, dust‑proof and anti‑pollution performance to guarantee transformer reliability.
6. Based on conventional structures and proven technologies, effective support at coil end faces is improved for further enhanced short‑circuit current withstand capability.
7. All selected materials pass strict quality inspection, and raw‑material suppliers are audited in accordance with quality management systems. The products are widely applied in supporting 6‑pulse, 12‑pulse, 18‑pulse and other multi‑pulse frequency converters.
8. Customized design and manufacturing solutions are available according to types of frequency converters, rectifiers and user requirements.