Home > SCB 35kV Energy-Saving Cast Resin Dry Type Transformer (30-25000 kVA)
Product Overview:
Engineered to bring primary distribution voltages safely indoors, the STELLAR 35kV Energy-Saving Cast Resin Dry Type Transformer is a high-capacity (up to 25,000 kVA) power solution. It efficiently steps down 35kV transmission grids directly to 10kV or 0.4kV levels, eliminating the need for intermediate outdoor substations.
Designed with advanced vacuum epoxy resin technology, this unit is 100% oil-free, eliminating fire and leakage hazards. It complies with rigorous international standards (IEC 60076) and is the definitive choice for underground infrastructure, high-rise developments, heavy industrial plants, and metropolitan load centers.
Key Advantages:
• Completely fire-proof and self-extinguishing for uncompromised indoor safety
• Capable of stepping 35kV directly down to working voltages (10kV or 0.4kV)
• High-grade silicon steel core ensures ultra-low iron losses and operating noise
• Outstanding mechanical strength to withstand severe short-circuit stresses
• Moisture-proof epoxy encapsulation with zero partial discharge
| TECHNICAL PARAMETERS (35kV DRY TYPE TRANSFORMER) | |
|---|---|
| Installation Environment | Indoor |
| Rated Capacity | 30 - 25000 kVA |
| Rated Voltage (HV / LV) | 35 kV / 10 kV, 35 kV / 0.4 kV |
| Impedance (%) | 6 - 10 |
| Insulation Class | Class F / Class H |
| Vector Group | Dyn11, Yyn0, Yd11 |
| Insulation Level (35/0.4kV) | LI170AC70/AC5 |
| Insulation Level (35/10kV) | LI170AC70/LI75AC35 |
| Execution Standards | IEC 60076, GB/T 10228-2023, GB/T 1094.11-2022, T/CEE A238-2018, JB/T 3837-2023 |
At the 35kV voltage class, electrical stresses are significantly higher, demanding flawless insulation. The high and low voltage coils are tightly encapsulated in a premium glass-fiber reinforced epoxy resin. Cast under high-vacuum conditions, this process completely eradicates trapped air and voids. The result is a solid, monolithic insulation system with virtually zero partial discharge, ensuring reliable, long-term operation under high-voltage conditions without degrading the dielectric medium.
As an advanced energy-saving transformer, the core is meticulously stacked using high-permeability, cold-rolled grain-oriented silicon steel sheets. The precision multi-step lap joints drastically reduce magnetic reluctance at the corners. This optimization cuts down hysteresis and eddy current losses, significantly lowering no-load energy consumption and enabling operators to achieve greener footprints and faster return on investment through electricity savings.
Unlike conventional transformers that require pre-drying after long shutdowns, this cast resin transformer is highly impervious to moisture. The dense epoxy coating acts as an impenetrable barrier against humidity and corrosive airborne contaminants. It can be safely energized even in damp subterranean vaults or tropical climates, ensuring consistent uptime for critical infrastructure.
Equipped with highly thermally conductive Class F (155°C) or Class H (180°C) insulation, the unit manages heat exceptionally well. Under standard Natural Air (AN) cooling, it maintains continuous 100% load output. When peak demands occur, optional Forced Air (AF) cooling fans can be automatically engaged via the smart temperature controller, allowing the transformer to safely sustain overloads of up to 120% without compromising its lifespan.
Bringing 35kV directly to the load center usually requires extensive safety perimeters. However, this dry-type power transformer's compact footprint and complete lack of flammable oil allow it to be installed directly inside buildings or prefabricated compact substations. This significantly reduces necessary civil engineering, cabling, and land acquisition costs, making it a highly economical choice for dense urban environments.
Safety and space optimization are the primary reasons. Oil-immersed units pose fire and leakage risks, requiring expensive fire-rated containment vaults indoors. This dry type transformer is completely oil-free, flame-retardant, and self-extinguishing, allowing it to be installed safely and closely to the load center, which also saves on heavy low-voltage cabling.
At 35kV, the electrical stress on windings is intense. Our vacuum casting process eliminates microscopic air bubbles and voids within the epoxy resin. This guarantees virtually zero partial discharge, preventing insulation degradation over time and ensuring the transformer withstands severe short-circuit forces and high-voltage transients safely.
Built with premium Class F or Class H insulation, the transformer easily handles 100% capacity under Natural Air (AN) cooling. By integrating Forced Air (AF) cooling fans, it can safely sustain temporary overloads of up to 120%, making it highly adaptable for facilities with sudden, fluctuating power demands.
The transformer utilizes a natural convection design (AN) supplemented by optional cross-flow fans (AF). It features an intelligent temperature controller linked to PT100 sensors embedded in the low-voltage windings. This system provides real-time thermal monitoring, automatically triggering fans, alarms, or trips if safe operating thresholds are exceeded.
