Dry Type Transformers Advantages

1. Core Advantages of CHH Power’s Dry-Type Transformers

(1) High Safety & Environmental Friendliness

• Fireproof & Pollution-Free: No insulating oil, eliminating risks of oil leakage, fire, or soil/water pollution. This allows direct installation in load centers (e.g., industrial workshop interiors, commercial building basements)—reducing transmission losses and saving installation space.
• Compliance with Strict Standards: Meets IEC 60076-11 and GB/T 10228 safety standards, with flame retardancy ratings (UL94 V-0) for epoxy resin insulation—suitable for fire-sensitive areas like hospitals and data centers.

(2) Robust Mechanical & Electrical Performance

• Advanced Domestic Technology: Adopts precision winding processes and high-strength insulation materials, ensuring high mechanical strength and strong short-circuit resistance (withstands 25kA short-circuit current for 2 seconds).
• Low Partial Discharge: The epoxy resin casting system minimizes partial discharge (≤10pC at 1.73×rated voltage), reducing insulation degradation and extending service life to 20+ years.
• High Thermal Stability: Uses Class H insulation materials (withstanding 180°C) and optimized winding heat dissipation paths, maintaining stable performance even in high-temperature environments.

(3) Energy Efficiency & Low Maintenance

• Low Loss & Noise: Equipped with low-loss grain-oriented silicon steel cores and oxygen-free copper windings, no-load loss is reduced by 15% compared to traditional models. Noise levels are ≤55dB (for 200kVA models)—ideal for noise-sensitive areas like residential communities.
• Maintenance-Free Operation: The sealed insulation structure prevents dust and moisture ingress, eliminating the need for regular oil changes or insulation checks. Only annual dust cleaning is required, reducing maintenance costs by 70%.

(4) Strong Adaptability & Overload Capacity

• Excellent Heat Dissipation: Natural air cooling (AN) ensures stable operation under rated load; optional forced air cooling (AF) boosts capacity by 20% (e.g., a 200kVA transformer can handle 240kVA temporarily) to meet peak load demands.
• Good Moisture Resistance: Epoxy resin insulation has a moisture absorption rate of <0.1%, enabling reliable operation in high-humidity environments (relative humidity ≤95%, no condensation)—suitable for coastal or tropical regions.

(5) Intelligent Monitoring & Protection

• Integrated Temperature Control System: Equips an intelligent signal temperature controller that automatically detects and displays three-phase winding temperatures. It triggers fan startup (at 100°C) and shutdown (at 80°C), with over-temperature alarm (130°C) and tripping (150°C) functions to prevent equipment damage.

(6) Compact & Cost-Effective Design

• Small Size & Light Weight: A 200kVA cast resin dry-type transformer has a footprint of ~1.2m×0.8m (30% smaller than oil-immersed models) and weighs ~500kg—reducing transportation and installation costs by 20%.

2. Main Structural Forms of CHH Power’s Dry-Type Transformers

(1) Open-Type (Atmosphere-Contact Design)

• Structure: The transformer body is open, with windings and cores directly in contact with the atmosphere.
• Cooling Methods:
  • Air Self-Cooling (AN): Relying on natural air convection for heat dissipation—suitable for small-capacity models (≤100kVA) in dry, clean indoor environments (ambient temperature ≤40°C, relative humidity ≤85%).
  • Forced Air Cooling (AF): Equipped with axial cooling fans—used for medium-capacity models (150kVA–500kVA) requiring higher overload capacity, such as industrial plants with fluctuating loads.
• CHH Power Application: Typical models include the SCB13 series (10kV/0.4kV), widely used in urban residential districts and commercial buildings.

(2) Sealed-Type (Explosion-Proof Design)

• Structure: The transformer body is enclosed in a sealed steel shell, isolated from the atmosphere. The shell is designed for explosion-proof (Ex d IIB T4) to prevent ignition of external flammable gases.
• Key Advantage: Poor heat dissipation is offset by optimized internal heat exchangers; mainly used in harsh, explosive environments like mines, oil refineries, and chemical plants.
• CHH Power Application: Customized EX series sealed dry-type transformers, compatible with mining power grids (6kV/1.14kV).

(3) Cast Resin-Type (Injection Molding Insulation)

• Structure: Windings are fully encapsulated with epoxy resin or modified resin via vacuum casting, forming a solid insulation layer.
• Key Advantages: Simple structure, small volume, high insulation strength, and resistance to dust and chemicals—suitable for small-capacity transformers (30kVA–200kVA) in indoor, dusty environments (e.g., workshops, power distribution rooms).
• CHH Power Application: SCB11 series cast resin dry-type transformers, popular in small industrial enterprises and data center auxiliary power systems.