Hunan Hentg Power Electric Technology Co., Ltd.
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Product Specification
| High Light | Fire safe epoxy resin transformer ，315kVA dry type transformer ，20/0.38kV distribution transformer | ||
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.
| 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.
Company Details
Business Type:
Manufacturer
Year Established:
2011
Total Annual:
300-500MVA
Employee Number:
150~200
Ecer Certification：
Verified Supplier
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