High Efficiency Epoxy Resin Cast Dry Type Transformer 80kVA 10/0.4kV for

The 80kVA dry-type transformer employs a vacuum-cast epoxy resin insulation system to step down 10kV to 0.4kV in three-phase, four-wire distribution networks. Designed with the renewable energy sector in mind, it eliminates liquid dielectric risks and provides consistent, low-loss power conditioning essential for inverter-fed systems, bidirectional energy flows, and frequently cycling loads. The unit is factory-tested for partial discharge, thermal performance, and dielectric integrity, and engineered for long service life with minimal on-site intervention.

• Optimized Efficiency for Variable Green Power: Low-loss core materials and precision winding geometry reduce no-load and load losses, helping solar, wind, and storage projects meet strict energy yield targets.
• Fire-Safe, Self-Extinguishing Construction: The epoxy resin cast coils are inherently flame retardant and will not sustain combustion, eliminating fire propagation risks without needing active suppression.
• Exceptional Tolerance to Load Cycling and Harmonics: Robust vacuum-cast windings and Dyn11 vector group suppress triple harmonics and withstand thermal stress from frequent charge-discharge cycles common in battery storage and EV charging.
• Hermetic Environmental Protection: Full encapsulation provides a barrier against moisture, dust, and salt-laden air, allowing the transformer to be installed in coastal wind farms, dusty solar fields, or unheated equipment enclosures.
• Nearly Silent, Maintenance-Free Operation: Natural air cooling (AN) as standard ensures quiet running without mechanical fans, while solid insulation removes the need for oil sampling or leakage monitoring.

Rated Power:

80kVA continuous duty at natural air cooling (AN); optional forced-air cooling (AF) for enhanced overload capability

Primary Voltage:

10kV with standard off-circuit tapping ±2*2.5% (other ranges configurable)

Secondary Voltage:

0.4kV three-phase four-wire, neutral brought out

Vector Group:

Dyn11 (30° phase displacement), other groups such as Dyn5 or Yyn0 available on request

Frequency:

50Hz or 60Hz as per project specification

Insulation System:

Class F or Class H, with temperature rise typically limited to 100K (Class F) or 125K (Class H) depending on design, preserving thermal reserve

Winding Technology:

High-voltage winding in sectioned layer type, low-voltage winding in foil type, both fully encapsulated under high-vacuum epoxy resin casting process

Core:

High-permeability, grain-oriented silicon steel, step-lap joints, and low-loss grade to reduce no-load losses and magnetostriction noise

Cooling Method:

AN (natural air) as standard; AF (forced air) with thermistor-controlled fans optional

Enclosure Options:

IP00 for protected indoor cubicles; IP20 or IP23 weatherproof enclosures available for outdoor or publicly accessible installations

Noise Level:

Designed for low sound pressure level, typically well within limits for residential and light-commercial environments

Partial Discharge:

≤10pC at 1.1 times rated voltage, ensuring long-term insulation reliability

Standards Compliance:

Designed and tested according to IEC 60076-11, with additional conformity to applicable national standards; fire behavior per relevant sections of EN 50588

Overload Capability:

Built to sustain short-time overloads as defined in dry-type transformer guidelines; AF option increases cyclic overload headroom

• Q1: Is this transformer compatible with PV inverters that generate high levels of harmonic currents?
  A: Yes. The Dyn11 connection is effective at canceling zero-sequence and third-harmonic currents, reducing additional heating. The transformer also uses a low-loss core and generously rated winding insulation to handle harmonic loading within IEC limits.
• Q2: Can the transformer support short-duration overloads typical in wind turbine and fast charging applications?
  A: Absolutely. The standard AN-cooled unit can manage limited short-term overloads as per IEC guidelines. For sites with frequent, heavier overload cycles, we recommend specifying the forced-air (AF) cooling option, which provides a tangible increase in cyclic overload capacity.
• Q3: What enclosure protection is recommended for outdoor solar or EV charging installations?
  A: We offer IP23 weatherproof enclosures designed to prevent water spray, dust ingress, and accidental contact, making them suitable for outdoor yards, solar parks, and public charging plazas. IP20 is typically sufficient for enclosed electrical compartments inside containers or kiosks.
• Q4: How does the epoxy resin insulation cope with the thermal stress of battery storage systems that cycle daily?
  A: The vacuum-cast epoxy winding system has a thermal expansion coefficient closely matched to the copper or aluminum conductors, minimizing internal stress during temperature changes. Combined with a Class F or H thermal design, it comfortably handles daily cycling loads without insulation cracking or degradation.
• Q5: What testing documents and after-sale support do you provide for EPC renewable energy projects?
  A: Every unit comes with routine test reports covering turns ratio, winding resistance, load and no-load losses, dielectric strength, and partial discharge measurement. On request, we supply type test certificates, dimensional drawings, and packing declarations. Technical support is available throughout installation, commissioning, and the warranty period.

Request your detailed product datasheet, loss curves, and a customized quotation for your renewable energy application today.