As a comprehensive power equipment provider, CHH Power offers a diverse range of transformer products tailored to global energy needs. Its portfolio covers five core transformer types, each engineered to meet specific grid requirements—from ultra-high-voltage power transmission to rural distribution networks. Below is a detailed overview of CHH Power’s focus and technical insights across these categories.
1. Power Transformers
CHH Power operates and manufactures key models of power transformers for large-scale grid systems, with representative specifications including: 1150kV/1200MVA, 735–765kV/800MVA, 400–500kV (3-phase 750MVA or single-phase 550MVA), and 220kV/3-phase 1300MVA. It also produces converter transformers for DC transmission projects, such as the ±500kV/400MVA model.
- Dominant Design: Most of CHH Power’s power transformers are oil-immersed, available in two structural types: core-type and shell-type.
- Core-type: Accounts for 95% of CHH Power’s production. It is favored for its simpler manufacturing process, making it the standard choice for mainstream grid applications.
- Shell-type: Constitutes 5% of production, with a more complex structure and manufacturing process. CHH Power reserves this design for scenarios requiring high voltage and large capacity, as it offers advantages in insulation, mechanical stability, and heat dissipation. Notably, it is ideal for transporting to hydropower stations in mountainous areas due to its structural adaptability.
2. Distribution Transformers
CHH Power’s distribution transformers are designed to match global market demands, with a maximum capacity of 2500kVA. They feature two core configurations:
- Round Core: The most widely used type, offering mature performance and reliability for general distribution scenarios.
- Oval Core: Characterized by a smaller core column pitch (M0), which reduces material consumption. CHH Power pairs this core with oval coils to optimize cost-efficiency.
In terms of construction, CHH Power’s low-voltage coils for distribution transformers are available in wire-wound and foil-wound designs. Its fuel tanks primarily use corrugated structures (for most models) and a small number of radiator tube designs, ensuring efficient heat dissipation for long-term operation.
3. Dry-Type Transformers
CHH Power has actively expanded its dry-type transformer lineup, aligning with China’s rapid market growth. These transformers now account for 50% of installations in major cities like Beijing, Shanghai, and Shenzhen, and 20% in other large and medium-sized cities.
- Structural Variants: CHH Power’s dry-type transformers include four designs: epoxy resin-cast, filler-cast, wrapped, and impregnated.
- Global Technology Focus: While open-ventilated H-class dry-type transformers (adopting Nomex paper and advanced winding structures) are widely used in Europe and the US, CHH Power is researching this technology for future localization. Currently, its domestic-leading dry-type transformers include a 2500kVA/10/0.4kV distribution model and a 16000kVA/35/10kV power model—both with industry-topping short-circuit test capacities.
4. Amorphous Alloy Transformers
Recognizing their energy-saving advantages, CHH Power has invested in amorphous alloy transformers despite challenges like poor short-circuit resistance and high noise. The company views them as a high-potential product for future energy-efficient grids.
- Production Capacity: CHH Power collaborates with China’s largest amorphous alloy core manufacturers, which have an annual production capacity of 3,000–4,000 tons.
- Technical Focus: Core and transformer manufacturing technologies no longer limit product promotion. CHH Power is now focusing on breakthroughs in amorphous alloy strip quality, as this will be key to leaping forward in product performance and reliability.
5. Wound Core Transformers
CHH Power’s wound core transformers are mainly focused on the 10kV voltage level, with capacities typically below 800kVA (though 1600kVA models have been trial-produced). They are particularly suited for rural power grids, where the power sector primarily purchases models below 315kVA.
- Market Layout: CHH Power partners with over 200 domestic wound core transformer manufacturers (20% of which are large-scale). While China’s total production capacity for such transformers reaches approximately 16 million kVA, CHH Power optimizes its output based on rural grid demand to ensure supply-demand balance.
Through this diversified product portfolio, CHH Power effectively supports various energy scenarios—from ultra-high-voltage transmission to rural electrification—demonstrating its technical versatility and market adaptability.