HJ-CRT Series Cast Resin Dry-Type Transformer
Up to 35kV / Up to 2500kVA / Fire-Retardant & Maintenance-Free
The HJ-CRT Series Cast Resin Dry-Type Transformer is the ultimate safe power solution for highly populated and critical indoor environments. Engineered with premium epoxy resin cast under high vacuum, it completely eliminates the fire and explosion risks associated with traditional oil-filled transformers. Leveraging our robust manufacturing capabilities, we tailor the voltage ratings perfectly to your local grid standards, delivering ultra-low noise, exceptional moisture resistance, and IEC-compliant performance.
Ideal for Critical & High-Density Applications:
- ✓ High-Rise Commercial Buildings & Residential Towers
- ✓ Underground Subways, Tunnels & Airports
- ✓ Hospitals, Data Centers & Critical Infrastructure
- ✓ Highly Polluted or Humid Industrial Plants
1. Absolute Fire Safety (Zero Oil)
Safety is the primary driver for dry-type selection. The HJ-CRT utilizes self-extinguishing, flame-retardant epoxy resin. Without any insulating oil, there is absolutely zero risk of leakage, fire propagation, or explosion. This allows the transformer to be installed directly at the load center (even underground or indoors), drastically reducing expensive low-voltage cable runs and distribution losses.
2. Premium Vacuum Resin Casting (Low PD)
The high-voltage windings are meticulously cast in a highly controlled vacuum environment. This advanced process eliminates internal air voids (ensuring Partial Discharge ≤ 10pC), preventing insulation breakdown over time. The fiberglass-reinforced resin matrix prevents cracking under extreme thermal shock, ensuring a highly reliable lifespan exceeding 30 years.
3. Global Voltage Matching & 40% Overload Capacity
We leverage our mature manufacturing platform to perfectly align with your target market voltages (e.g., 11kV, 13.8kV, 20kV, 33kV). Furthermore, when equipped with an automated cross-flow cooling fan system (AF mode), the transformer can safely sustain a 40% to 50% capacity overload during peak demand periods without any thermal degradation.
4. Exceptional Moisture & Seismic Resilience
The solid resin encapsulation renders the windings completely impervious to moisture, allowing the transformer to be safely energized without pre-drying—even in environments with 100% relative humidity. The solid monolithic structure of the core-and-coil assembly also provides extraordinary mechanical strength to withstand severe short-circuit electrodynamic forces and seismic events.
Global Factory Acceptance & Turnkey Support
Every HJ-CRT transformer is rigorously tested in accordance with IEC 60076-11 standards. Tests include lightning impulse, applied voltage, and stringent partial discharge (PD) measurements. Units can be supplied as IP00 (open core) for seamless switchgear integration or with customized IP20/IP23 protective enclosures featuring integrated smart temperature controllers.
Performance Matrix & Technical Specifications
(Note: The matrix below outlines our standard capacities up to 2500kVA for Cast Resin Dry-Type Transformers. Specific voltages, enclosure IP ratings, and insulation classes are fully customizable to meet your local utility requirements.)
| Parameter / Rated Power | 100kVA | 500kVA | 1000kVA | 1600kVA | 2500kVA |
|---|---|---|---|---|---|
| Primary Voltage | Up to 35kV (e.g., 10kV, 11kV, 13.8kV, 20kV, 33kV) | ||||
| Secondary Voltage | 0.4kV / 0.415kV / 0.433kV / 0.480kV | ||||
| Cooling Mode | AN / AF | AN / AF | AN / AF | AN / AF | AN / AF |
| Typical Impedance (%) | 4.0% | 4.0% | 6.0% | 6.0% | 6.0% |
| Vector Group | Dyn11 / Yyn0 / Custom Configurations | ||||
| Insulation Class | Class F (155°C) / Class H (180°C) | ||||
| Enclosure Rating Options | IP00 (Core only) / IP20 (Indoor Box) / IP23 (Outdoor Weather-proof) | ||||
| Compliance Standards | IEC 60076-11 / IEEE C57.12.01 | ||||
General System Ratings
- Partial Discharge Level: ≤ 10 pC (Ensuring long-term insulation integrity).
- Cooling Capacity Boost (AF Mode): Forced air cooling safely increases rated capacity by up to 40%-50% during peak loads.
- Temperature Controller: Integrated PT100 sensors with digital display and automated fan/trip control outputs.
- Environmental Certifications: E2 (Environment), C2 (Climate), F1 (Fire behavior) certified for extreme reliability.
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