Fire Safe Epoxy Resin 315kVA 20/0.38kV Dry Type Distribution Transformer for High Density Urban Infrastructure
315kVA fire-safe epoxy resin transformer for urban infrastructure. 20/0.38kV rating with copper/aluminum windings. Features flame-retardant insulation, moisture resistance, low maintenance, and compact design. Ideal for high-density areas and harsh environments.
This 315kVA three-phase epoxy resin dry type distribution transformer provides a secure and efficient medium-voltage power delivery solution for modern built environments. Rated at 20kV on the primary side and 0.38kV on the secondary, it eliminates the fire and leakage risks associated with liquid-filled units, making it the preferred choice for densely populated urban centers, commercial high-rises, mixed-use developments, and expanding industrial estates.
The cast resin encapsulation grants the windings outstanding resistance to moisture, chemical vapors, and thermal stress, ensuring stable operation even in coastal or high-humidity climate zones. With low partial discharge values and a proven loss profile, this transformer supports utilities, EPC contractors, and facility owners seeking long service life with minimal intervention.
- Inherent Fire Safety and Self-Extinguishing Resin: The epoxy resin insulation system is flame retardant and does not produce toxic fumes under thermal duress. This removes the need for costly fire vaults or fire suppression systems, directly aligning with building codes for indoor installation.
- Climate-Resilient Moisture and Salt Fog Protection: Sealed cast resin windings block ambient humidity and saline air ingress, preventing surface tracking and dielectric degradation. The transformer thrives in coastal zones and high precipitation regions without supplemental dehumidification.
- Superior Energy Efficiency and Low Partial Discharge: Low no-load and load losses meet or surpass local high-efficiency grade thresholds. The controlled manufacturing process yields extremely low partial discharge levels, preserving insulation life over decades.
- Maintenance-Free Operation and Condition Monitoring: No oil sampling, no leak checks, no liquid disposal. An integrated temperature control unit with PT100 sensors continuously monitors winding and core temperatures, triggering cooling fans and alarms for truly unattended reliability.
- Compact Footprint and Flexible Installation: The small physical envelope and optional IP enclosure ratings allow the unit to be placed directly at the load center, inside basements or electrical rooms. This reduces secondary cable runs, lowers installation costs, and frees up valuable real estate.
| Parameter | Specification / Detail |
|---|---|
| Rated Capacity | 315 kVA |
| Voltage Ratio | 20 kV / 0.38 kV (3-phase, 50 Hz) |
| Vector Group | Dyn11 (standard) or Yyn0 on request |
| Cooling Method | AN (natural air) / AF (forced air, with fan kit) |
| Insulation Class | F (155°C) with temperature rise limit class H (180°C) |
| Insulation Medium | Class H epoxy resin cast under vacuum |
| Partial Discharge | ≤10 pC at rated voltage |
| Tapping Range | ±2*2.5% off-circuit tap changer (HV side) |
| Sound Level | ≤ 52 dB(A) (AN, at 1 m, IEC 60076-11 compliant) |
| Protection Degree | IP00 indoor; optional IP23, IP43, IP54 weatherproof enclosures |
| Thermal Protection | Embedded PT100 temperature sensors with smart controller (alarm and trip setpoints) |
| Standards | IEC 60076-11, IEC 60076-1, ISO 9001, applicable national grid access specifications |
| Altitude | ≤1000 m asl (customized designs for higher elevations) |
| Finish | Rust-proof galvanized steel or stainless steel fasteners with weather-resistant paint |
Core and conductor materials are selected to meet project-specific specifications: high-permeability grain-oriented silicon steel minimizes losses, while copper or aluminum windings are precisely wound and cast to ensure uniform insulation thickness and mechanical short-circuit strength.
Difficulty the design addresses: Persistent high relative humidity and salt mist accelerate corrosion and cause internal condensation in ordinary transformers.
Implemented solution: The winding is completely encapsulated in hydrophobic epoxy resin without air voids. Stainless steel fixings and anti-corrosion surface treatment protect the frame. An optional anti-condensation space heater inside the enclosure prevents moisture build-up when the transformer is idle.
Difficulty the design addresses: Urban cores require silent, fireproof equipment that can fit inside limited floor areas and comply with stringent life safety regulations.
Implemented solution: The self-extinguishing cast resin system achieves F1 flammability class (IEC) and generates negligible smoke. The magnetic core is optimized to keep sound power low, meeting noise limits acceptable for residential and office adjacency. Vertical or horizontal air ducting can be customized for building-specific ventilation layouts.
Difficulty the design addresses: Frequent motor starts, variable process loads, and fast-track construction timelines place demands on electrical resilience and commissioning speed.
Implemented solution: The winding's high mechanical strength withstands inrush currents and short-circuit forces without deformation. The transformer is delivered factory-tested and ready to connect, cutting on-site construction time. Forced air cooling (AF mode) can temporarily increase available capacity to manage production peaks.
Difficulty the design addresses: Substations in distant infrastructure corridors or islanded grids may lack routine maintenance crews.
Implemented solution: The absence of liquid dielectric removes bush-clearing and containment requirements. The digital temperature controller with RS485 communication can relay real-time status to a SCADA system, enabling remote monitoring and alarm management for EPC integrators.
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