Home > SCB 20kV Energy-Saving Cast Resin Dry Type Transformer (30-25000 kVA)
Product Overview:
The 20kV Energy-Saving Cast Resin Dry Type Transformer is engineered for high-capacity, high-efficiency power distribution in primary to secondary grid conversions. Offering a massive capacity range from 30kVA up to 25000kVA, this epoxy resin cast transformer steps down 20kV transmission voltages directly to 10kV or 0.4kV distribution levels safely and reliably.
As an advanced energy-saving transformer, it utilizes premium cold-rolled silicon steel cores and vacuum-cast insulation to virtually eliminate partial discharge and minimize operational losses. Completely oil-free, flame-retardant, and self-extinguishing, it serves as the ultimate maintenance-free indoor power solution for high-density urban grids, large commercial facilities, subway networks, and highly regulated industrial environments.
Key Advantages:
• Fully flame-retardant, self-extinguishing, and explosion-proof for maximum indoor safety
• Vacuum-cast imported epoxy resin ensures zero partial discharge and high dielectric strength
• Capable of operating at 100% load continuously, with 120% overload capacity under forced air (AF)
• Highly moisture-proof, allowing safe operation even in extremely humid environments
• Integrated intelligent temperature control system for real-time monitoring and safety
| TECHNICAL PARAMETERS (20kV DRY TYPE TRANSFORMER) | |
|---|---|
| Installation Environment | Indoor |
| Rated Capacity | 30 - 25000 kVA |
| Rated Voltage (HV / LV) | 20 kV / 0.4 kV, 20 kV / 10 kV |
| Impedance (%) | 4 - 10 |
| Insulation Class | Class F / Class H |
| Vector Group | Dyn11, Yyn0 |
| Insulation Level | LI125AC50/AC5, LI125AC50/LI75AC35 |
| Execution Standards | IEC 60076, GB/T 10228-2023, GB/T 1094.11-2022, GB 20052-2024 |
The reliability of this epoxy resin cast dry type transformer stems from its meticulous manufacturing process. The high and low voltage windings are encapsulated using imported epoxy resin reinforced with glass fiber, cast under strict vacuum conditions. This sophisticated technique prevents the formation of air bubbles and voids, ensuring zero partial discharge. The solid resin block provides outstanding mechanical strength, easily withstanding the severe electro-dynamic forces generated during short circuits.
Safety is the primary driver for utilizing dry type transformers indoors. Our 20kV transformer is entirely oil-free, rendering it non-explosive and inherently flame-retardant. It is self-extinguishing and will not emit toxic fumes when exposed to high heat. Furthermore, the dense, non-porous resin encapsulation grants it exceptional moisture resistance. It can safely endure prolonged periods of high humidity and can be re-energized without prior drying, making it highly reliable for subterranean or tropical installations.
Optimized for minimal environmental impact and low operational cost, this energy-saving transformer incorporates a high-permeability cold-rolled silicon steel core. The precise cutting and overlapping joint construction minimize magnetic reluctance and hysteresis losses. This design drastically reduces no-load (iron) losses and ensures ultra-low noise operation, well below standard industry thresholds, guaranteeing a quiet and highly efficient lifecycle.
The transformer features superior thermal endurance, utilizing high-grade Class F (155°C) or Class H (180°C) insulation systems. Under natural air convection (AN), the unit operates flawlessly at 100% of its rated capacity. When integrated with cross-flow cooling fans (forced air, AF), the transformer's excellent thermal dissipation design allows it to safely carry up to 120% of its rated load. This high overload ceiling makes it highly adaptable to unexpected peak demand periods.
Equipped with an intelligent temperature control system featuring embedded PT100 sensors, the transformer actively monitors coil temperatures. It can automatically activate cooling fans, trigger alarms, and initiate safety trips if thermal limits are approached. Coupled with its space-saving, compact footprint and aesthetically pleasing design, this transformer reduces civil construction costs and seamlessly integrates into tight indoor substation layouts.
The main advantages include absolute fire safety (flame-retardant and self-extinguishing), zero oil leakage risks, a completely maintenance-free lifespan, excellent moisture resistance, and ultra-low partial discharge thanks to its vacuum-cast epoxy resin construction.
By utilizing high-quality cold-rolled silicon steel cores with optimized joint configurations, the transformer significantly lowers no-load (iron) losses and idling currents. This translates to higher operational efficiency and reduced daily electricity waste, lowering the overall payback period for the facility.
Yes, it is designed with excellent thermal endurance. Under natural air cooling (AN), it runs continuously at 100% capacity. When forced air cooling fans (AF) are activated, the transformer can safely sustain up to 120% overload capacity to manage sudden peak power demands.
Absolutely. Because it contains no combustible liquids and relies on self-extinguishing epoxy resin, it eliminates fire and explosion hazards. This makes it the standard, mandated choice for indoor installations in high-rise buildings, hospitals, subways, and crowded commercial centers.
