H-Class Non-Encased Dry-Type Transformer
Product Overview
A dry-type transformer with H-class insulation (180℃ rated temperature) and a non-encapsulated structure. It uses air as the cooling medium (no insulating oil) and relies on advanced insulation materials and processing technology to achieve safe and stable operation, suitable for scenarios requiring high fire safety and environmental friendliness.
Key Specifications:
Rated capacity: Covers 100kVA–3150kVA, matching mainstream medium and small power distribution demands.
Voltage grades: Focuses on 6kV/10kV high-voltage and 0.4kV low-voltage, adapting to industrial and civil power distribution systems.
Core parameters: Vector group supports Dyn11/Yyn0 (common configurations for dry-type transformers); tapping range is ±2×2.5% or ±5% to adjust voltage flexibly; short-circuit impedance meets industry standard requirements (typically 4.0%/6.0%/8.0%).
Structural features: Non-encapsulated design for direct heat exchange with air; windings adopt Nomex paper insulation and undergo multiple vacuum pressure impregnation (VPI) processes with solventless H-class varnish, followed by high-temperature curing.
Advantage
High Safety & Environmental Friendliness No flammable resins or halogens, non-combustible during operation, and no toxic gas emissions even in extreme conditions. It does not explode or leak, eliminating fire and environmental risks, making it ideal for indoor, densely populated, or fire-sensitive areas.
Stable Performance & Durability H-class insulation (180℃) with core insulation materials reaching C-class (220℃) heat resistance, providing ample overload capacity (supports 20% long-term overload without additional cooling). Excellent short-circuit resistance and low partial discharge (≤5PC) ensure reliable operation in harsh environments.
Energy Efficiency & Low Maintenance Optimized core and winding design reduces no-load and load losses, achieving energy-saving effects. The non-encapsulated structure and VPI process enhance insulation reliability, with a design service life of up to 30 years and minimal maintenance needs (no oil replacement or related auxiliary facility upkeep).
Flexible Customization No molds required for production, enabling personalized design based on customer voltage, capacity, and on-site environmental needs. Short production cycles ensure timely delivery, matching the “factory prefabrication, on-site quick installation” industry trend.
Application
Commercial & Civil Buildings: High-rise buildings, shopping malls, residential communities, and data centers—meeting strict indoor fire safety and space-saving requirements.
Industrial & Special Facilities: Factories, mines, petrochemical plants, medical institutions, and research laboratories—resisting harsh industrial environments and ensuring uninterrupted power supply for critical equipment.
Public Infrastructure: Transportation hubs (airports, railway stations), subway systems, and power station auxiliary systems—adapting to high-reliability and seismic/vibration-resistant demands.
