BTW 14 New Products Pass National-Level Appraisal

On June 28, the national-level new product appraisal meeting for Baoding Tianwei Baobian Electric (BTW) was held in Beijing. The meeting was organized by the China Machinery Industry Federation. The expert panel of the appraisal committee was led by academicians of the Chinese Academy of Sciences and Chinese Academy of Engineering, bringing together more than 60 renowned industry experts and scholars from Huairou Laboratory, State Grid, China Southern Power Grid, China Three Gorges Corporation, China General Nuclear Power Group, Xi'an Jiaotong University, North China Electric Power University, and other institutions.

Xie Qingfeng, Director of the Science and Technology Innovation Department of China Electrical Equipment Group, attended the meeting. Xu Tao, Party Secretary and Chairman of BTW, delivered a speech. Liu Dongsheng, Deputy Party Secretary, Director, and General Manager of BTW, gave a vote of thanks during the group appraisal sessions. Relevant leadership team members and group-level third-tier advisors also participated in the appraisal meeting.

At the meeting, the expert panel listened to on-site presentations on the R&D achievements of the products, reviewed the appraisal materials, and after technical inquiries, comprehensive deliberation, and thorough discussion, unanimously concluded that 14 new products from BTW had passed the appraisal. Among them, 12 products reached the international leading level, and 2 products reached the international advanced level.

1. TX-600000/138 Single-Core Asymmetric Phase-Shifting Transformer — International Leading

   

   This product was developed to address the industry challenges of flexible power flow control in power grids and balanced power dispatch in regional grids. Its overall structural layout is scientifically sound, and its design concept is pioneering within the industry. The unit exhibits outstanding operational characteristics, including a wide phase adjustment range, flexible regulation logic, low operating noise, excellent long-term temperature rise control, and extremely low partial discharge levels. It can effectively adapt to power flow optimization scenarios in complex regional interconnected grids, providing a new technical solution for safe and stable grid operation.

2. SFP-820000/800 Large-Capacity Three-Phase Integrated Generator Transformer — International Leading

   

   This product is a three-phase integrated step-up main transformer for large-scale thermal power and concentrated solar power plants. It incorporates multiple innovations in leakage flux suppression, significantly reducing overall stray losses. While maintaining insulation safety margins, the overall tank width and self-weight have been reduced, lowering transportation difficulty and civil construction costs. The unit features a highly integrated and compact structure, excellent temperature rise control under load, and partial discharge indicators far exceeding national standards, making it suitable for use with large generator units.

3. SFFZ-500000/500 Axial Split Transformer — International Leading

   

   Designed for large-capacity dual-circuit power collection and transmission scenarios in new energy stations, this product features significant innovations in structural design and insulation schemes, fundamentally enhancing the axial short-circuit withstand capability of the core. The unit offers high integration, a small footprint, and far superior short-circuit withstand performance compared to conventional products of its kind, with extremely low partial discharge levels during operation. It is widely applicable to power supply scenarios with multiple load branches, such as new energy bases and large industrial captive power plants.

4. ZZDFPZ-415000/750-400(200) Converter Transformer — International Leading

   

   This converter transformer is one of the core critical equipment items for ultra-high voltage direct current (UHVDC) transmission projects, achieving a breakthrough in the domestic substitution of core insulation materials. For the first time in the industry, domestically produced high-performance insulating pressboard and insulation molded parts have been comprehensively applied to a 750kV grid-side converter transformer, eliminating dependence on imported insulation materials. The overall operational performance has been comprehensively optimized, with four core indicators—operating noise, load loss, long-term temperature rise, and partial discharge—simultaneously improved. The compact equipment layout makes this a landmark product in the domestic upgrade of UHVDC projects.

5. SFP-1170000/220 Ultra-Large Capacity Step-Up Transformer — International Leading

   

   Specifically designed for step-up collection scenarios in large-scale wind and solar new energy bases, this product leads the industry in capacity, with a structural design that balances performance and transport feasibility. The unit employs mature and efficient leakage flux control technology, significantly reducing stray losses during operation. Through optimized design, internal tank space occupation has been greatly reduced, and overall external dimensions have been minimized, solving the industry challenges of oversized external dimensions and difficult overland transportation for ultra-large capacity equipment. The unit features a compact and rational structure, stable temperature rise under load, and low partial discharge, meeting the step-up requirements of ultra-large capacity new energy centralized transmission stations.

6. SSZ20-240000/220 Upper-Lower Split Offshore Wind Power Transformer — International Leading

   

   This product is deeply adaptable to complex operating conditions such as high salt spray, strong vibration, and long-distance maritime transport, making it a core piece of equipment for advancing the domestic upgrade of offshore wind power equipment. By optimizing the radiator arrangement, the offshore platform footprint has been significantly reduced. The modular design facilitates on-site offshore assembly, disassembly, and maintenance. A new internal fixation scheme effectively withstands continuous vibration impacts from ship transport and wave motion. The overall corrosion protection performance reaches the industry's highest CX protection level, enabling long-term resistance to high humidity, salt spray, and ultraviolet corrosion in marine environments. The unit combines multiple advantages including compact structure, low partial discharge, low losses, low temperature rise, strong vibration resistance, and long-lasting corrosion protection, making it suitable for installation in various offshore and nearshore wind farms.

7. DW-600-V-T×5 Water Cooler for Flexible DC Transformers — International Leading

   

   As a core auxiliary equipment item for flexible DC converter transformers, this product addresses two major pain points: the confined installation space of urban flexible DC converter stations and the safety risks of oil-water leakage. It employs a double-layer leak-proof barrier, structurally eliminating the safety hazards of equipment short circuits and insulation breakdown caused by oil-water mixing. The unit features a compact, modular integrated design that perfectly fits the space-constrained, densely equipped layout of urban flexible DC converter stations. The anti-corrosion lifespan of the cooling and heat exchange piping has been greatly extended, and the overall heat exchange efficiency is significantly superior to traditional air-cooled and conventional water-cooled equipment. The cooler delivers efficient and stable cooling performance, low vibration and noise, and a small overall footprint, making it a standardized auxiliary cooling equipment item for UHVDC flexible converter stations.

8. ZLSCB-14000/22 Dry-Type Start Isolation Transformer for Gas Turbines — International Leading

   

   This project has advanced the domestic production of dry-type start isolation transformers for large gas turbines. The product is applied in national heavy-duty gas turbine energy projects and can withstand 1.65 times rated overload, featuring outstanding short-term overload capability and adaptability to frequent start-stop cycles. The winding features a uniform internal electric field distribution, effectively suppressing partial discharge. The coupling coefficient between the grid-side and valve-side windings is controlled at 0.169, significantly attenuating high-frequency harmonic oscillations generated during turbine startup and protecting the stability of the control system. The use of high-thermal-conductivity resin in a one-piece casting provides strong short-circuit withstand capability, along with fire and explosion protection, convenient operation and maintenance, and safety and environmental friendliness.

9. ZTS-45000/10 3×30 Pulse Rectifier Transformer for Compressed Air Energy Storage — International Leading

   

   Custom-developed for rectifier systems in compressed air energy storage power stations, this product features an innovative multi-pulse rectifier structure. The unit employs three independent cores arranged in a straight line along the long axis of the tank. The number of high-voltage lead exits has been significantly reduced, simplifying the lead insulation structure. Optimized connections on the outer windings enable a 30-pulse rectifier output from a single core, and the combination of three cores achieves an overall ultra-high 3×30 pulse rectification effect. The transformer features low losses, uniform temperature rise, a high number of output rectifier pulses, extremely small impedance differences between branches, and high phase-shifting angle control precision, effectively reducing harmonic mitigation investment in energy storage stations.

10. ZHSF-16070/33 Rectifier Transformer for New Energy Hydrogen Production — International Leading

    

    This product meets the high-power rectifier power supply requirements of electrolyzers for green hydrogen production, with significant optimization of the core and winding structures. The unit adopts a three-phase three-limb core structure with a yoke to balance the magnetic field distribution. A same-mode integrated winding process enhances winding performance, and differentiated low-voltage winding designs accommodate high DC output conditions. An integrated high-strength clamping frame enhances short-circuit withstand capability. The equipment features low losses, stable temperature rise, and strong short-circuit withstand capability, supporting long-term continuous operation of green hydrogen production projects.

11. SS-GL-30000/35 Converter Transformer for Grid-Forming Static Var Generators — International Leading

    

    Focused on the development of grid-forming SVG reactive power compensation equipment for new power systems, this product achieves breakthroughs in harmonic suppression and impedance matching technology. A dedicated filter winding greatly improves the filtering efficiency of high-order harmonics. It flexibly adapts to the stable operation of grid-forming SVG in low-inertia grids. The core has sufficient insulation margins and a smaller volume, and the tank design has been optimized to suppress stray losses. The unit features low operating losses, low vibration and noise, and excellent harmonic suppression, making it a core supporting equipment item for the stable grid connection of new wind and solar stations.

12. ZSSS-67500/132 Variable Frequency Start Rectifier Transformer — International Leading

    

    Specifically designed for frequent start-up conditions of large variable frequency motors, this product features innovative winding and cooling structures adapted to cyclic loads. The dual-split windings are axially integrated in a single winding process, with a compact inner low-voltage and outer high-voltage configuration that streamlines the internal layout. A built-in natural oil-directed cooling system ensures stable temperature rise control during load fluctuations. A removable maintenance enclosure on the tank side wall facilitates easy servicing. The unit delivers excellent operational performance and is widely used in variable frequency start systems for large pumps, fans, and compressor units.

13. OSFPSZ-280000/400 Three-Phase On-Load Tap-Changing Autotransformer — International Advanced

    

    This product fully complies with the stringent electrical equipment standards of the European Union and is developed for overseas cross-border transmission and transnational grid interconnection markets. It features a self-developed 11-point core positioning system and a clamp-type tank structure that meets long-distance transport and road transport clearance requirements. Reinforced tank construction and explosion-proof pressure relief devices enhance the transformer's fire and explosion resistance. The unit delivers balanced overall operational performance, with low long-term load temperature rise, excellent noise control, and partial discharge indicators meeting both domestic and international standards, making it a leading autotransformer product for export to overseas high-end power transmission and transformation markets.

14. SFFZ-70000/330 Air-Cooled Split On-Load Tap-Changing Power Transformer — International Advanced

    

    Suitable for 330kV regional grids and large-capacity voltage regulation power supply scenarios at new energy collection stations, this product features multiple optimizations and upgrades in winding insulation and lead structures. The low-voltage winding adopts a double-layer "U" structure, with appropriately shaped rigid support blocks at the inner and outer layer transitions to enhance axial short-circuit strength. A double-half toothed insulation support structure in the middle of the core effectively extends the creepage distance. The unit maintains stable temperature rise during operation and low partial discharge levels. The air-cooled heat dissipation system is simple to operate and maintain, effectively enhancing the flexibility and reliability of voltage regulation in regional grid power supply.